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2023 Vol. 40, No. 6
Published: 2023-06-15
 
1 Research on the Route Selection Design of Intercity Railway in Shenzhen Metropolitan Area
TAN Qing
Research purposes： Through the analysis of the difference in the distribution of the inter-city railway in Guangdong-Hong Kong-Macao Greater Bay Area, the inter-city railway in the new era metropolitan area presents the development trend of introducing the urban center. For intercity railways passing through the urban center, due to various external factors such as city planning, transportation, water conservancy, environmental protection, and structures, in order to achieve coordinated development between the city and intercity railways and ensure smooth construction of the project, a systematic review and research have been conducted on the design ideas for the route selection of intercity railways passing through the urban center.Research conclusions： (1) Suggestions were put forward for overall route selection, including planning compliance and environmental protection. (2) From the perspective of station distribution and location selection, the spacing and location selection of stations were analyzed, and thought for station setting was proposed. (3) The design ideas for the introduced route scheme from the perspective of introducing stations and airports were provided. (4) From the perspective of interval route selection, combined with control factors such as terrain, geological conditions, and external structures along the railway, suggestions were put forward for horizontal and vertical design. (5) The research results fully combine the construction experience of Shenzhen metropolitan area intercity railway, and have important guidance and reference significance for the horizontal and vertical design of intercity railway, and the stability of route and station scheme in the new era.
2023 Vol. 40 (6): 1-5 [Abstract] ( 12049 ) HTML (1 KB)  PDF  (789 KB)  ( 1434 )
6 Research on the Scheme of Chongqing-Changsha-Xiamen Railway through Changsha Area
LUO Mingbo
Research purposes： The Chongqing-Changsha-Xiamen Railway is a high-speed railway connecting Chongqing, Changsha and Xiamen. This paper compares and selects the macro alignment plan of the Chongqing-Changsha-Xiamen Railway passing through the Changsha area, and further selects the local plan for crossing the Changsha urban area based on the macro alignment plan of the line.Research conclusions： (1) The introduction of high-speed railway into a region needs to balance the relationship between railway and urban planning, existing and planned infrastructure, and not only needs to meet the requirements of railway transportation, but also needs to integrate human landscape and urban development, so as to select the reasonable route plans.(2) In conjunction with factors such as the layout of the hub in Changsha and the overall urban planning of Changsha, the route lengths, impact on existing lines and investment are compared. The scheme of passing through the airport and Liuyang is recommended for the macro alignment. Further analysis involves considerations such as the impact on urban layout, social risks, engineering complexity and cost-effectiveness, and the scheme along the Beisanhuan Road is determined, which can better meet the main project requirements. (3) The research results are fully applied in the survey and design of the Changsha-Ganzhou Railway, which are in line with the project approval and review plan.
2023 Vol. 40 (6): 6-11 [Abstract] ( 6254 ) HTML (1 KB)  PDF  (1211 KB)  ( 1130 )
12 Research on the Planning and Layout of Shanghai-Hangzhou Railway Corridor Based on Systematic Thinking
ZHANG Jian, WU Qigang
Research purposes： The Shanghai-Hangzhou Railway Corridor is an important part of the national "eight vertical and eight horizontal" high-speed railway main corridor. Currently, it is faced with the situation of tight capacity, low transportation quality, unbalanced coverage, and weak support, which cannot meet the needs of for high-quality travel. In accordance with the general idea of "systematic planning, overall coordination, and step-by-step implementation", the role and division of labor of each line of the Shanghai-Hangzhou Railway Corridor shall be studied in a systematic way, and the overall coordination of the regional road network and the smooth connection of relevant corridors shall be the goal. The analysis and research are carried out from various aspects such as corridor demand, road network function, and the key issues are studied such as the planning pattern, function orientation and division of labor, construction scheme and sequence, main technical standards and freight system in the Shanghai-Hangzhou Railway Corridor. Research conclusions：（1）The 10-line pattern of the Shanghai-Hangzhou Railway Corridor planning is appropriate.（2）In the initial planning, the newly built Shanghai-Zhapu-Hangzhou Railway will mainly undertake the passenger flow of Shanghai Pudong, Jiaxing and Hangzhou and beyond, and take into account part of the passenger flow in Puxi; The newly built Shanghai-Hangzhou Intercity Railway mainly undertakes the intercity passenger flow between Puxi, Jiaxing and Hangzhou, taking into account some middle and long-distance passenger flow.（3）The speed target value of the Shanghai-Zhapu-Hangzhou Railway should be 350 km/h, and the speed target value of the Shanghai-Hangzhou Intercity Railway should be 350 km/h, and the condition of the line to increase the speed to 400 km/h is reserved.（4）Overall consideration should be given to the integrated development of passenger transport, freight transport and rail networks at different levels, to create a series of comprehensive transportation hubs and to guide the integrated development of urban agglomerations.（5）The research thinking and results can be used for reference in the study of similar railway corridors in China.
2023 Vol. 40 (6): 12-17 [Abstract] ( 3985 ) HTML (1 KB)  PDF  (1194 KB)  ( 1036 )
18 Research on the Overall Design Goals and Countermeasures of the Yunnan-Tibet Railway
DENG Junqiao
Research purposes： The Yunnan-Tibet Railway is a trunk railway of the railway network with the function of national land development. And the Shangri-La-Ranwu section is located in the three parallel rivers area. The regional terrain, geological and ecological environment is complex, and the project is arduous, which brings great challenges to the construction and operational safety of the project. How to analyze the characteristics of Shangri-La-Ranwu section and the key and difficult problems that need to be solved under the complex natural environment conditions, combined with the functional requirements of the project, determine the overall design goals and ideas of the project, put forward countermeasures to achieve the goals, and smoothly promote the project planning construction work is the main purpose of this research. Research conclusions： (1) Based on the analysis of the functional requirements and regional natural characteristics of the project, the key and difficult problems to be solved by this project are put forward, the overall design goals of the Yunnan-Tibet Railway are determined as national defense strategic goals, land development goals, safety and reliability goals, and green and low-carbon goals. (2) Around the four goals, the overall design ideas of the project are formulated, and specific countermeasures are put forward by the geological survey, route selection, engineering design, ecological environmental protection, comprehensive monitoring and so on. (3) In terms of geological survey, it is proposed to adopt the "space-air-ground" multi-source comprehensive geological survey technology system to identify engineering geological and hydrogeological conditions, evaluate the potential risks and propose engineering countermeasures. In terms of line selection, it is put forward the principle of station site selection, and the line selection ideas and principles of "going high, going to the side", "avoiding fractures and selecting hard rock", and put forward recommendations for comprehensive corridors, the route direction plan, three parallel rivers area and the route selection plan of Jinsha River bridge. In terms of bridge engineering, it is proposed to use long-span suspension bridge and arch bridge to adapt to the terrain and improve the freedom of line selection. In terms of tunnel engineering, countermeasures are proposed in the aspects of large deformation of soft rock, hard rock burst, anti-seismic design, karst and groundwater treatment, and poor gravity geology of the tunnel entrance for long and deep tunnels. In terms of environmental protection engineering, the principles and countermeasures on waste water, waste slag treatment and ecological restoration are put forward. In terms of comprehensive monitoring, a comprehensive monitoring system in mountainous areas with complex natural environment is proposed, which combines engineering treatment of high and steep slopes, landslides, and debris flows with safety monitoring along railway lines. (4) The research results can provide reference for the design of complex and difficult mountainous railway systems and the research of line schemes.
2023 Vol. 40 (6): 18-25 [Abstract] ( 3760 ) HTML (1 KB)  PDF  (1923 KB)  ( 1351 )
26 Application of Comprehensive Survey Technology in Active Fault Investigation of High-speed Railway
WANG Ganggang
Research purposes： Active faults have great influence on high-speed railway line selection. Especially, Holocene active faults can cause secondary geological disasters such as sand liquefaction, ground fissures, surface subsidence and surface deformation. Therefore, it's very important to select the correct survey technology to find out the location and activity of active faults for the geological line selection and engineering measures of high-speed railway. Research conclusions：（1）Through data collection, geological survey, UAV surveying and mapping, comprehensive geophysical exploration, geological drilling, trough probe, 14C and opto-luminescence dating, it is found that the Anqiu-Juxian fault in the study area is an active fault in Holocene.（2） The strike-slip activity rate of the east branch of the Anqiu-Juxian fault is 1.49 mm/a, and the crossing mileage with the railway is DK141+780 and DK141+940. The vertical activity rate of the west branch of the Anqiu-Juxian fault since late Pleistocene is 0.16 mm/a, and the crossing mileage with the railway is DK152+275.（3）The high-speed railway should pass through the Anqiu-Juxian fault at a large angle, and the project type should adopt the simple project which is easy to repair.（4）The application of the comprehensive survey technology has achieved good results in the investigation of active fault zone and has certain guiding significance for the geological investigation of high-speed railway crossing active faults.
2023 Vol. 40 (6): 26-31 [Abstract] ( 3683 ) HTML (1 KB)  PDF  (5107 KB)  ( 1055 )
32 Stability Analysis of Foundation Pit Excavation Based on Finite Difference FLAC3D
CHENG Hongmei
Research purposes： During the excavation of foundation pit, the stress balance of the surrounding soil will be broken and the surrounding soil will be deformed, which will affect the safety and stability of the retaining structure. In order to research the stability of foundation pit in the process of excavation, this paper takes excavation project west of Urumqi Metro Line 4 as an example, adopting FLAC3D to establish a numerical calculation model. The variation law of displacement and stress during excavation is analyzed.Research conclusions： (1) The large horizontal displacement in the X direction at the surface layer in the excavation supporting area will affect the stability of the surface layer supporting structure, so the displacement monitoring should be strengthened. The horizontal displacement of pile support in the middle area of excavation face is large, which affects the stability of pile structure. And the large vertical displacement at the bottom of the foundation pit is easy to produce the basement uplift. (2) After the completion of excavation, the horizontal stress at the bottom of the foundation pit is large and there is stress concentration, which is easy to affect the safety and stability of the enclosure structure. (3) The research results can provide theoretical basis and engineering reference for formulating effective support and monitoring measures for similar projects.
2023 Vol. 40 (6): 32-38 [Abstract] ( 3660 ) HTML (1 KB)  PDF  (1259 KB)  ( 1035 )
39 Research on the Influence of Seamless Rack on the Continuous Welded Rail on the Simply Supported Girder Bridge
Research purposes： The rack railway has good climbing ability and has become the main type of mountain railway. In order to study the influence of seamless rack on the continuous welded rail (CWR) on the simply supported girder bridge of the rack railway, a rail (rack)-sleeper-bridge-pier integration model was established based on the bridge-track interaction and the characteristics of rack railway on bridges. The influence law of the seamless rack on the longitudinal force and deformation of the CWR on the bridge and the pier force is obtained.Research conclusions： (1) The seamless rack mainly affects the rail braking force and rail gap compared with the traditional CWR on the bridge. (2) With the increase of the gradient of the railway, the rail longitudinal force, the bridge pier longitudinal force, and the rail gap all decrease under the expansion, deflection and rail breaking conditions, the rail braking force, bridge pier longitudinal force and relative displacement between bridge and rail all increase under the braking condition. (3) When the railway gradient increases to 480‰, the rail expansion force, rack expansion force and abutment force decrease, the expansion force of rail and rack decreases by 4.24%, and the bridge pier abutment force decreases by 4.17%. The rail deflection force, the rack deflection force and the abutment force all decrease, the rail deflection force, the rack deflection force and the abutment longitudinal force decrease by 15.07%, 12.77% and 11.18% respectively. The rail braking force, the rack braking force, the longitudinal force of the bridge pier, the relative displacement of the rail bridge and the relative displacement of the rack bridge increase by 3.12 times, 4.37 times, 3.51 times, 3.33 times and 4.60 times respectively. As for the rack railway, the longitudinal instability should be avoided. The rail gap increases by 3.44%, and the pier abutment force decreases by 4.60%. (4) The research results could provide guidance for the design of CWR on bridges for rack railway.
2023 Vol. 40 (6): 39-45 [Abstract] ( 3158 ) HTML (1 KB)  PDF  (1161 KB)  ( 966 )
46 Research on the Mechanical Properties of Elastic Restraint System of Railway Long-span Continuous Beam Bridge
WANG Dezhi, YAN Aiguo, WEN Wangqing, YANG Dewang, ZHANG Zheng
Research purposes： The prestressed concrete continuous beam widely used in China's railway generally adopts a fixed restraint system, that is, a longitudinal fixed bearing is set, and the rest are longitudinal movable bearings. In this paper, the longitudinal elastic restraint system of railway long-span continuous beam bridge is studied for the first time, the basic principle of elastic restraint system and the calculation method of bearing stiffness are introduced, the concept of combined stiffness of continuous beam substructure is proposed, and the temperature deformation zero point of beam, the stress of bridge substructure, the earthquake resistance of bridge and the stress of track are analyzed.Research conclusions： (1) The longitudinal elastic restraint system of continuous beam is the coordinated force of multiple main piers, and by selecting the appropriate elastic support stiffness, the temperature deformation zero point of the continuous beam can be better controlled near the middle of the middle span, and the temperature joint length of the beam can be effectively reduced. (2) The horizontal force and track telescopic force of the fixed constraint brake pier of the continuous beam are reduced, and the track stress is reduced by about 24%. (3) The horizontal and longitudinal combined stiffness of the substructure is reduced, the self-vibration cycle of the bridge structure is prolonged, and the seismic performance of the structure is improved. (4) The technical achievements can be popularized and applied on the long-span continuous beam of the railway.
2023 Vol. 40 (6): 46-50 [Abstract] ( 3313 ) HTML (1 KB)  PDF  (950 KB)  ( 975 )
51 Research on the Influence of Pre-camber on Vehicle Dynamic Characteristics of Long-span Cable-stayed Bridge
Research purposes：The actual alignment of the long-span cable bridges can easily deviate from the theoretical design alignment, which is a difficult critical issue that may affect the safety and smoothness of the train operation. Proper pre-camber is one of the effective approaches to this problem. In this paper, a three-dimensional vehicle-track-bridge coupling dynamic model is established to analyze the vehicle dynamic response of a 330 m long bridge with main span under four alignment of the most unfavorable load superposition with pre-camber, and the influence of different pre-camber schemes on vehicle dynamic response of long-span cable-stayed bridge is investigated.Research conclusions： (1) The safety index and comfort index of train passing through the long-span bridge meet the standard requirements under different pre-cambers, and there are many safety redundancy. (2) Setting pre-camber can effectively reduce the vertical acceleration of vehicle and improve passenger comfort. (3) The most unfavorable position for the smoothness of the long-span bridge is at tower and the middle of main span. It is necessary to strengthen the construction quality control and pay attention to the observation and maintenance during the operation to ensure the operation safety and riding passenger comfort. (4) The research result can provide a reference for the design, construction and maintenance of the long-span cable-stayed bridge.
2023 Vol. 40 (6): 51-56 [Abstract] ( 3062 ) HTML (1 KB)  PDF  (2414 KB)  ( 885 )
57 Key Technology and Application Demonstration of Railway Uncoated Weather-resistant Steel Bridge
DAI Shengyong, CHEN Kejian, ZHANG Zhiyong, LIU Mingjun
Research purposes： Uncoated weather-resistant steel bridge has become a development trend of steel bridge in developed countries such as Europe, America and Japan, and has been widely used. However, uncoated weather-resistant steel bridge in China started late, lack of successful application experience, and has no design and manufacturing specifications. Relying on the Zangmu Bridge of Lhasa-Linzhi Railway, this paper carried out research on the key technologies of the construction of railway uncoated weather-resistant steel bridge, and accumulated the experience in the design and manufacturing of uncoated weather-resistant steel bridge, laying a foundation for the preparation of technical specifications for uncoated weather-resistant steel bridge and the popularization and application of railway bridges in China.Research conclusions： (1) According to the stress and durability requirements of steel, the requirements of mechanical properties, welding properties and weather resistance of uncoated steel are put forward, and the chemical composition design and test of uncoated steel with weather resistance index greater than 6.5 are completed. （2）Based on the ease to form and protect the stable rust layer, the detailed design requirements of uncoated steel bridge structural components and drainage layout are put forward.（3）The manufacturing requirements for the characteristics of weathering steel are put forward.（4）The research results can play a reference and demonstration role for the popularization and application of railway uncoated weather-resistant steel bridge in China.
2023 Vol. 40 (6): 57-61 [Abstract] ( 2764 ) HTML (1 KB)  PDF  (741 KB)  ( 972 )
62 Universal Calculation Method for Design Values of Tunnel Surrounding Rock Pressure under Different Burial Depth Conditions
XU Chen, XIAO Mingqing, XIE Biting, WANG Kejin, CUI Lan
Research purposes： The calculation of surrounding rock pressure is an important link in the quantitative design of tunnel supporting structure. There are obvious deficiencies in the current research, such as the abrupt change of surrounding rock pressure at the boundary of deep and shallow burial and the constant value of surrounding rock pressure at the deep burial stage, which are inconsistent with the practical cases. Therefore, the concept of design value of surrounding rock pressure is introduced in this paper, and a general method of design value of surrounding rock pressure based on failure mode of surrounding rock is proposed, which can provide theoretical guidance for the tunnel design under various burial depths. Research conclusions： (1) The method in this paper seeks the design value of surrounding rock pressure by calculating the ultimate equilibrium state of rock mass approaching or reaching the failure stage and the load in the failure zone, which has the universality to different tunnel characteristics. (2) The load evolution law of the support-failure zone is different in tunnel from shallow to deep, resulting in great differences in the pressure characteristics of surrounding rock. The support-failure zone load curve of shallow buried tunnel goes through four stages successively: full soil failure stage, compression shear failure stage on both sides, compression shear failure stage around the tunnel, no failure stage or local failure stage. The first two stages are dominated by slack load. The latter two stages are dominated by deformation pressure. When it is between the two stages, it is necessary to make a comprehensive judgment according to the tunnel limit equilibrium state and take the envelope value. The method in this paper can ensure the continuity of the calculation results of tunnel surrounding rock pressure changing with the buried depth. (3) Comparing to Code for Design of Railway Tunnel, the design value of surrounding rock pressure calculated by this method agrees better with that in the practical engineering, and has higher rationality and reliability.
2023 Vol. 40 (6): 62-68 [Abstract] ( 2951 ) HTML (1 KB)  PDF  (2831 KB)  ( 867 )
69 Influence of Earth Pressure Load on Lining Structure of Soil Tunnel
GAO Xuantao
Research purposes： At present, the vertical earth pressure at the top of the lining structure is usually considered as the uniform load, but the influence of the earth pressure load at the corner between the arch and the waist of the tunnel on the lining structure is rarely studied. In order to study the influence of earth pressure load at corner between arch and arch waist on the stress of lining structure, this paper uses the load-structure method to analyze and demonstrate the influence of earth pressure load at corner on the stress of lining structure based on the tunneled section from Sichuan Shida Station to Jiaozi Interchange station of Chengdu Metro Line 13, in order to provide useful help for the subsequent design of soil tunnel lining structure.Research conclusions： (1) Considering the earth pressure load between the tunnel arch and the arch waist, the extreme internal force and reinforcement of the lining structure increase compared with the vertical earth pressure uniform load mode, and the axial force increases more than the bending moment. (2) With the improvement of surrounding rock conditions and the increase of tunnel burial depth, the extreme value of internal force of tunnel lining structure and the increase of reinforcement amount under the action of corner earth pressure load gradually decrease. Therefore, when the surrounding rock conditions of tunnel are poor or the tunnel is (over) shallow buried, the lining structure design should reasonably consider the influence of corner earth pressure load to ensure the long-term safety of tunnel. (3) The research results can provide useful reference for the subsequent design of soil tunnel lining structure.
2023 Vol. 40 (6): 69-73 [Abstract] ( 2809 ) HTML (1 KB)  PDF  (866 KB)  ( 838 )
74 Experimental Study on the Load Characteristics of Prefabricated Inverted Arch Construction in Tunnels
WANG Fei
Research purposes： Compared with the traditional cast-in-place concrete structure, the prefabricated structure has the advantages of high standardization, convenient construction, small site occupation, high mechanization and environmental protection. When the prefabricated inverted arch is used in the mine method tunnel, the stress condition in the construction period should be considered in addition to the stress condition in the operation period. Therefore, the stress condition of the structure should be studied under the action of construction machines and tools, assembly machines, etc. Taking single track railway tunnel as the engineering background,the mechanical characteristics of precast invert block under construction load are studied through full-scale test.Research conclusions： (1) When the longitudinal tension of a single hole reaches 373 kN (37.3 t), the minimum circumferential seam can be closed. (2) The tightening effect is related to the tightening sequence and mode, and the proper tightening mode can improve the tightening effect. (3) During the whole process of construction load, the reinforcement and concrete are in compression state without any damage. The location and area of load action are important factors affecting the stress of inverted arch block. (4) This research result can be applied to the fields of mining tunnels and underground engineering, provide technical support for intelligent construction of tunnels.
2023 Vol. 40 (6): 74-81 [Abstract] ( 2788 ) HTML (1 KB)  PDF  (1473 KB)  ( 899 )
82 Research on the Grouting with Mould and Press-in-mould to Improve the Quality of Tunnel Second Lining
LIU Fei1, CHANG Juyou, CHEN Zhijun, LIU Zufu, ZHAO Zhong, ZHONG Zaihang, CHANG Yaoxin
Research purposes： In order to improve the overall quality of the second lining of the railway tunnel and prevent the cavity in the vault, this paper mainly studies on the prevention of cavity in the second-lining arch with mould grouting, and studies the prevention of non-compactness of the second-lining arch waist and arch wall with press-in-mould. Research conclusions： (1) During the implementation of vault grouting with mould, the grouting pipe and exhaust pipe are arranged in the vault, the slightly expanded cement slurry is pressed, the cavity gas is discharged, the cavity is filled tightly, and the quality of the second lining vault is improved. (2) During the implementation of the arch waist and arch wall with press-in-mould, the concrete of the arch waist and arch wall is poured into the formwork by the uniform pressure of multi-slideways, and the quality of the second-lining arch waist and arch wall is improved. (3) Both are used in the construction of the second lining of the tunnel, and the construction sequence is first the construction of the press-in-mould followed by the construction of the grouting with the mould, which improves the overall quality of the second lining of the tunnel and solves the problem that the second lining of the railway tunnel can not be eradicated for many years. (4) The research results can provide reference for improving the overall quality of the second lining in the tunnel construction in the fields of railway and highway.
2023 Vol. 40 (6): 82-86 [Abstract] ( 2711 ) HTML (1 KB)  PDF  (908 KB)  ( 1014 )
87 Research on the Disaster-causing Mechanism and Countermeasures of Tunnel Harmful Gas in Central Sichuan
ZHANG Yingxu, SU Peidong, CHEN Minghao, LI Yougui
Research purposes：With the continuous construction of tunnel projects in Suining and Ziyang areas of central Sichuan, the problem of harmful gases has gradually become prominent. In order to reduce the risk of harmful gases in tunnels in Suining and Ziyang areas of central Sichuan, this paper studies the geological and oil and gas characteristics of the area based on structural data, stratigraphic data, and oil and gas geological data combined with tunnel exploration and harmful gas testing results, and explores the disaster-causing mechanism of harmful gases in tunnels in the region.Research conclusions： (1) The lower multiple oil and gas reservoirs are abundant in the Suining-Ziyang area of Sichuan, and there is a rich source of harmful gases in tunnels. (2) The main mode of harmful gas transportation in the study area is through joint fissures, with stratigraphic continuity as a minor factor. (3) The anticline in the study area is wide and gentle, and its core has been eroded. The structural storage of harmful gases in the anticline is poor, and the storage space for harmful gases is mainly composed of joint fissures and sandstones, while mudstone serves as the cover layer for harmful gases. (4) Harmful gas enrichment is generally poor in the area, characterized by low concentrations of harmful gases in most tested boreholes and strong randomness in the distribution of harmful gases. (5) The research results can provide reference for the investigation and design of harmful gases in tunnels in similar strata and structural areas of the Sichuan Basin.
2023 Vol. 40 (6): 87-92 [Abstract] ( 2669 ) HTML (1 KB)  PDF  (1815 KB)  ( 952 )
93 Research on the Vibration of the Catenary System of Rigid Dropper for High-speed Railway in Strong Wind Region
YU Gang
Research purposes： When the pantograph passes through the rigid dropper at high speed, it will cause the separation between the rigid dropper and the insulating sleeve, generate dropper force, and cause the vibration of the catenary. After the wind load is superimposed, the vibration will intensify, affecting the pantograph catenary relationship, causing serious wear and even fracture of the dropper. To confirm the key points for the design, operation and maintenance of rigid dropper for high-speed railways in strong wind areas, and to determine the maximum wind speed that the contact network system of high-speed trains can adapt to when operating at full speed, a simulation model was established using finite element dynamics equations to simulate and calculate the digital characteristics and offline rate of dropper force on the Guangzhou-Shenzhen-Hong Kong Railway as the research object; Using the Davenport forward spectrum and Panofsky vertical spectrum to simulate fluctuating wind speed, study the coupling relationship between the overhead contact system and the pantograph under different speed and wind speed conditions, and seek the safe operation boundary and equipment weakness points of the rigid dropper overhead contact system in strong wind areas.Research conclusions： (1) Under the combined action of dropper force and wind load, the dropper closest to the positioning point is subjected to the greatest impact and vibration. Local reinforcement of the equipment should be considered in design, and special attention should also be paid during operation and maintenance. (2) The higher the wind speed, the more significant the trend of vibration increase. When the wind speed exceeds 20 m/s, the deterioration rate of the pantograph catenary relationship significantly accelerates. (3) The wind speed is greater than 20 m/s, and the dynamic performance of the pantograph and catenary exceeds the standard requirements. The rear pantograph problem is particularly prominent, which cannot meet the operating requirements of the high-speed train unit at a speed of 300 km/h. (4) The research results can provide reference for the design, operation and maintenance of the rigid suspension wire system contact network in strong wind areas, as well as for the organization of train operation during strong winds.
2023 Vol. 40 (6): 93-98 [Abstract] ( 2886 ) HTML (1 KB)  PDF  (997 KB)  ( 844 )
99 Research on the Main Technical Standards of 400 km/h High-speed Railway
SUN Haifu
Research purposes： At present, the maximum operation speed of high-speed railway at home and abroad is 350 km/h. Recently, some countries have proposed the intention of building 400 km/h high-speed railway, a large number of higher speed tests have been carried out on high-speed railway at home and abroad, abundant experimental data and scientific research achievements have been accumulated, which provides a theoretical basis for the research of key technologies of higher speed railway. It is of great significance to study the key technologies of 400 km/h high-speed railway and formulate corresponding technical standards for improving the technical standard system of China′s high-speed railway and leading the technical development of the world's high-speed railway. This paper analyzes the maximum operation and test speed and theoretical speed of high-speed railway at home and aborad, explains the main technical standards, and makes an economic analysis, which has a strong reference and guidance for similar projects. Research conclusions： (1) The main technical standards of 400 km/h high-speed railway, such as construction gauge, design live load, subgrade, bridge, tunnel, maintain the current 350 km/h design standard. (2) The equipment system design standard of 400 km/h high-speed railway basically maintains the current 350 km/h design standard, and only the contact wire material and contact tension are strengthened. (3) The minimum curve radius of 400 km/h high-speed railway is generally 8 000 m, and 7 000 m is difficult, 9 000 m is preferred when conditions permit. The distance of double lines is maintained the current design standard of 350 km/h. (4) The vehicle body sealing index of 400 km/h EMU shall not be less than 10 s, and the vehicle body strength shall not be less than 8 kPa. (5) The design standard of 400 km/h high-speed railway is of great significance to guide the design of high-speed railway and lead the development of high-speed railway in the world.
2023 Vol. 40 (6): 99-103 [Abstract] ( 2915 ) HTML (1 KB)  PDF  (664 KB)  ( 993 )
104 Practice and Observation of Localized Application of FIDIC Contract Conditions in Design-build Bidding of International Project
ZHU Xin
Research purposes： FIDIC Contract Conditions enjoy high reputation in the global engineering contract form for their relative justice and fairness. Meanwhile, FIDIC Contract Conditions are widely used in international engineering field for their strict conditions, strong operability and clear risk liability. This paper mainly introduced the application of FIDIC Conditions of Contract for Plant and Design-Build(Yellow Book) in the DB bidding of the SLH Railway Project. By comparative analysis of time of completion, quality control and investment control between FIDIC Yellow Book and the Bidding Documents of Government Procurement of Infrastructure of the host country, this paper conducted in-depth discussion for practice and strategy of localized application of FIDIC Yellow Book. Research conclusions： (1) The key point of localized application of FIDIC Contract Conditions is to adapt the unique construction supervision & legislation environment in the host country. (2) Particular contract conditions are particularly important and should match to the characteristics of the project. (3) The research results can provide reference for the negotiation and signing of contract conditions for international DB bidding.
2023 Vol. 40 (6): 104-104 [Abstract] ( 2923 ) HTML (1 KB)  PDF  (867 KB)  ( 861 )
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