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2022 Vol. 39, No. 6 Published: 2022-06-15

Engineering Economy and Management Main Line: Survey and Design Main Line: Engineering Geology and Subgrade Main Line: Railway and Rail Main Line: Communication Signals Information Technology Main Line: Electrification Engineering Main Line: Research on Railway Networks

Main Line: Research on Railway Networks

	1	Discussion on the Four Networks Integration of Rail Transit
		CHEN Li
		Research purposes: Four networks integration is a necessary measure to build a metropolitan area on the track, strengthen the benefits of rail transit network, realize resource sharing, improve passenger travel efficiency and improve service quality. At present, there is no systematic research on four networks integration, and there are few targeted experience and research results. This paper systematically analyzes the influencing factors of four networks integration, discusses the four networks integration mode, and suggests the development mechanism of four networks integration, which has a certain reference significance for the research of four networks integration. Research conclusions: (1)There are many constraints on the integration of the four networks. In order to promote the sustainable development of the integration of the four networks, we should plan and coordinate the research in advance at the planning and research stage, and establish and improve relevant mechanisms. (2) The integration scheme shall reasonably select the integration mode according to the specific situation of the project, not only the integration of line engineering, but also the innovation of new management and operation modes, so as to maximize the benefits, transportation capacity and service level of rail transit network. (3) The research results can provide guidance and reference for the research of four networks integration.
		2022 Vol. 39 (6): 1-3 [Abstract] ( 4052 ) HTML (1 KB) PDF (582 KB) ( 2662 )

	4	Research on the Program of Introducing Jakarta-Bandung High-speed Railway into Jakarta Terminal
		WU Bilong
		Research purposes: By analyzing the current layout of Jakarta railway terminal, combined with the functional positioning of Jakarta-Bandung High-speed Railway, from the aspects of passenger flow attraction capacity, project construction conditions, transfer conditions with other rail transit modes, municipal supporting facilities conditions and urban master planning, the weight analysis method is used to determine the station site selection scheme for the introduction of Jakarta-Bandung High-speed Railway into Jakarta Terminal. For the station scale with 3 platforms and 6 tracks of Halim station, the station operation capacity in non-peak and peak hours is studied through operation time calculation and graphic analysis. Research conclusions: (1) The plan of introducing Jakarta-Bandung High-speed Railway into Jakarta Terminal is that Halim station will be newly built, and conditions for extending to Gambir and Manggarai station is reserved in the future. The scheme can not only meet the short-term and long-term passenger transport demand, but also conform to the key development direction of the city. The short-term investment is low, the construction difficulty is small, and the long-term development conditions are fully reserved. (2) The research results can provide reference for the design of similar overseas railway projects.
		2022 Vol. 39 (6): 4-10 [Abstract] ( 4040 ) HTML (1 KB) PDF (1281 KB) ( 2209 )

	11	Research on the Schemes of Leading Tianjin-Weifang Railway into Tianjin Railway Hub
		YU Hongfei, DONG Rukai
		Research purposes: As a common part of the Beijing-Shanghai and Coastal high-speed railway corridor in the medium and long-term railway network planning, Tianjin-Weifang High-speed Railway has an important railway network channel and intercity function. On the basis of the analysis of the passenger flow volume, considering the railway hub function orientation, the city master plan and railway hub master plan, the leading scheme has been systematically studied through the following aspects: introduction direction, selection of the route into Beijing, selection of the route into northeast direction and selection of the starting station, to provide a reference for the introduction of the Tianjin-Weifang High-speed Railway into Tianjin Hub. Research conclusions: (1) During the study of a high-speed railway leading into a complex railway hub, the city master plan as well as the railway function positioning in the network must be taken into consideration to choose a reasonable service scope. (2) For high-speed railway main lines, the rear access route should be compatible with its technical standards, to maximize its channel capacity. (3) The division of passenger stations within the railway hub should be considered comprehensively, so that the urban development can be promoted by the introduction of the new line. (4) The capacity of the existing railway facilities should be made full use of to avoid projects waste. (5) The research results can be directly applied to the subsequent construction and implementation of the Tianjin-Weifang Railway, and provide reference for the introduction of similar high-speed railway main line into large railway hub.
		2022 Vol. 39 (6): 11-17 [Abstract] ( 2717 ) HTML (0 KB) PDF (920 KB) ( 1925 )

Main Line: Survey and Design

	18	Application and Analysis of 3D Seismic Reflection Technology in the Subsea Tunnel Survey
		SUN Honglin, HU Qingbo, LIU Tie, YAO Chengzhi
		Research purposes: Due to problems such as the maritime traffic environment, the marine beacon condition and the changing terrain and geological conditions, the traditional survey methods and equipments have many limitations in subsea tunnel engineering survey. Based on the project and combined with the characteristics of the project site, the 3D seismic reflection technology was applied to investigate the subsea tunnel engineering, and the new idea of subsea tunnel in complex environment was explored, to provide reliable survey results for engineering design. Research conclusions: (1) Based on the 3D seismic reflection technology and correction of drilling results, we can accurately simulate the shape, position and mutual contact relationship of each ground level and structure, and provide reliable geological basis and physical parameters. (2) According to the 3D geological modeling results, we can analyze the geological conditions of the tunnel section and provide the geotechnical geological conditions of the tunnel, which can provide reliable basis for engineering design. (3) Geological modeling combined with multi-source data can significantly improve the accuracy of geological model. Analysis shows that the average difference percentage can reach 0.907%, which gets high accuracy and good reliability. (4) The research results can be applied in the investigation of the underwater tunnel.
		2022 Vol. 39 (6): 18-23 [Abstract] ( 3084 ) HTML (0 KB) PDF (913 KB) ( 1957 )

	24	Research on the Overall Reconstruction Scheme of Rail Transit in Operation Based on Professional Synergism
		DAI Zhiren, WANG Zeyu, WANG Jun, JI Ruiqi, ZHOU Hongchang
		Research purposes: As for the reconstruction of operated rail lines caused by its connection with large railway hubs, the reduction of the interruption time of rail operation is the most important factor should be considered. Considering the reconstruction difficulty, the method that can not only meet the railway operation requirements, but also can reduce reconstruction period and reconstruction difficulty, is put forward. Research conclusions: (1) The overall reconstruction method for elevated rail line based on the minimum influence range and the shortest outage time, which can realize the operation of main line and branch line, is put forward. (2) As for elevated station, escalators will be dismantled in stages, the reserved groove in broadened middle plate is adopted in the connection with pedestrian bridge. And the adjacent reconstruction method for elevated station in stages without interrupting metro operation can be formed. (3) As for elevated railway interval, based on the basic principle of parallel operation and effective connection of successive process, the casting technology of elevated bridge with lateral position and lateral translation is put forward. And then, the least interruption time for rail transit operation can be realized. (4) As for the post-station engineering, based on the principle of professional synergism and crossed construction, the controlling process of track laying and catenary transformation is found, and the catenary transformation time can include the time of reconstruction of ring cable, water supply and drainage, communication transformation, and signal installation and debugging. (5) The research results can lead a reference for similar project in future.
		2022 Vol. 39 (6): 24-30 [Abstract] ( 2165 ) HTML (0 KB) PDF (1844 KB) ( 2010 )

	31	Research on the Calculation Method of Arbitrary Cross-section Property for Railway Bridge Structures
		YANG Zhihui
		Research purposes: Cross-section property is an important parameter in design of railway-bridge structures, not only in resistance of structure calculation, but also in engineer quantity calculation. With a variety of structure types, such as beams, piers and foundations, the railway-bridge has complex cross-section types, such as box section and hollow section. The cross-section property calculation of complex section type in design is accomplished by simplified processing method or external business software in usual practice, which result in insufficient calculation accuracy and low design efficiency. To solve this problem, it is necessary to research the calculation method of arbitrary cross-section property. Research conclusions: (1) Any cross-sections type of railway-bridge structure is consist of segments and arcs, every segment of arc could be represented by a unified format. Based on this, arbitrary cross-section type could be described by one or more closed contours, which is composed of segments and arcs. (2) Every closed contour could be considered as multiple sets of triangle patch or triangle-spherical-crown patch with the common vertex. The cross-section property of the whole closed contour could be got by summing all the patches property. (3) A general calculation program was developed based on the calculation method proposed in this paper. This program had the function of reading and processing graphic data of AutoCAD software. (4) Taking concrete box beam and thin-walled steel box beam as examples, the calculation results showed that the method proposed in this paper had high calculation accuracy and met the requirements of engineering design. (5) Besides the railway-bridge engineering, the calculation method could also be used in highway or municipal engineering.
		2022 Vol. 39 (6): 31-36 [Abstract] ( 3285 ) HTML (0 KB) PDF (590 KB) ( 2478 )

Main Line: Engineering Geology and Subgrade

	37	Stability Analysis and Treatment Measures of High-speed Railway Adjacent to Deep Coal Mine Goaf
		YAN Dong
		Research purposes: With the rapid development of high-speed railway, railway route selection will inevitably be restricted by the influence of deep coal mine goaf. Such goaf has the characteristics of thick overburden layer, large buried depth of coal seam, thick coal seam and large-scale deformation of surface after mining. The surface deformation of coal mine goaf has significant security risks for the safe operation of high-speed railway. Accurately identifying the boundary conditions of the coal mine goaf and evaluating the stability of the site are the core issue of safety and stability of railway. Taking the deep coal mine goaf adjacent to high-speed railway as an engineering example, the engineering geological conditions and boundary conditions of deep coal mine goaf are identified by using comprehensive survey technology, and the stability of the site is comprehensively evaluated by surface deformation monitoring. It provides a reliable basis for railway safety pillar and engineering protection measures, so as to ensure the safety and stability of high-speed railway. Research conclusions: (1) By using comprehensive investigation methods such as coal mining data, surface deformation survey, geophysical exploration and deep hole drilling, the boundary range of deep goaf is comprehensively determined. (2) According to the monitoring results of surface deformation and the deformation trend interpreted by InSAR, the stability of goaf is comprehensively evaluated by timeliness analysis. (3) The influence range of surface deformation in planned mining area is predicted by probability integral method, and the width of protecting pillar is determined safely and reasonably. (4) Protective measures of railway engineering and coal mine mining control measures are proposed. (5) The research conclusions can provide reference for stability evaluation of similar goaf.
		2022 Vol. 39 (6): 37-42 [Abstract] ( 3344 ) HTML (0 KB) PDF (1427 KB) ( 1957 )

	43	Research on the Treatment and Monitoring of Soft Soil Landslide in Piedmont Coal Measure Stratum Slope
		CHEN Haijun, WANG Zhimeng, HE Jianping, QIU Yongping
		Research purposes: The slope soft soil of piedmont coal measure strata has the related characteristics of general soft soil, still disadvantages gathering like the accumulation of surface water and groundwater caused by slope topography converge, the composition of soft soil layer, and the inclination of underlying bedrock surface. So the self-stability of slope soft soil is worse than that of conventional sedimentary soft soil. When high-speed railway passes through the soft soil area of piedmont coal measure stratum slope, it is easy to cause slope collapse and landslide. Through a typical case, this paper studies and analyzes the comprehensive treatments of the slope soft soil landslide in the piedmont coal measure strata, and explores how to reduce or even avoid the related diseases. Research conclusions: (1) After the soil cover sealing layer on the slope surface is damaged, the surface water quickly infiltrates into the slope stratum dominated by the completely weathered layer of carbonaceous shale and doped with more hard debris and block stones, resulting in the water absorption saturation softening of carbon shale components, rapid reduction of strength, and the formation of piedmont slope soft soil. (2) The geological characteristics of the slope soft soil formed by the softening of carbonaceous shale and the inclined bedrock surface are the internal causes of landslide formation; Rainfall recharge to groundwater is the external cause; The external force disturbance such as slope loading and toe unloading is the direct cause of landslide formation. (3) When there are environmental sensitive sources in the upper and lower reaches of the landslide, the design method of anti-sliding by sections for the sensitive sources and subgrade is more effective. (4) Systematic whole process deformation monitoring is necessary and effective. (5) The research results can provide reference for the cause research and control technology of slope soft soil landslide in piedmont coal measure strata.
		2022 Vol. 39 (6): 43-49 [Abstract] ( 2323 ) HTML (0 KB) PDF (1237 KB) ( 1983 )

	50	Application of Circular Strut System in Large Special-shaped Deep Foundation Excavations
		WU Kun
		Research purposes: With the development of the rail transit network, many large-scale multi-line transfer stations have appeared, and their foundation excavations are generally super-large and irregular. How to choose a safe economical and reasonable retaining structure is essential. Based on foundation excavation of Tianhe Park Station of Guangzhou, the paper carried out the research on the bracing design of the super-large special-shaped deep foundation excavation. According to the requirements of the construction period, deformation control measures and optimization schemes were proposed. Research conclusions: (1) Compared with the traditional strut system, the circular strut can significantly reduce the number of struts, and the strut plan is flexible and economical. (2) The partitioning implementation design of the foundation excavations can reduce the difficulty of supporting design and improve the force of the retaining structure, but it leads to an increase in the construction period. Under the comprehensive assessment of the two factors of the foundation excavation safety and the construction schedule, that reasonable partitioning implementation of the foundation excavation is essential. Compared with the original retaining and protection structure, the total construction period of the large foundation excavation of this project can be saved by 8 months. (3) The circular strut system has a great advantage in supporting special-shaped foundation excavation, and it can also meet the stress requirements of supporting structure under the condition of non-uniform compression to ensure the safety of foundation pit. (4) The research results can provide some theoretical reference and engineering reference for special-shaped deep foundation excavations.
		2022 Vol. 39 (6): 50-55 [Abstract] ( 2243 ) HTML (0 KB) PDF (844 KB) ( 1945 )

	56	Comparison of Main Design Technical Standards of Chinese and Serbian Railway Subgrade
		XIA Qidi
		Research purposes: Hungary-Serbia Railway in Serbia is mainly designed according to European Union's standards and Serbian standards. In order to promote Chinese standards to go global, the following aspects are compared with Chinese standards: track and train load, profile and width of subgrade surface, structure of subgrade bed, subgrade filling material and compaction criteria, slope protection, drainage engineering of subgrade, retaining structure and subgrade settlement control. The differences in the main design technical standards of the Chinese and Serbian railway subgrade are put forward to study the applicability of Chinese standards in railway subgrade engineering in Serbia. Research conclusions: (1) The standards of China and Serbia have made different provisions on track and train load, profile and width of subgrade surface, structure of subgrade bed. The design of railway subgrade needs to be based on Serbian standards. (2) In terms of subgrade filling material and compaction criteria, slope protection, drainage engineering of subgrade and subgrade settlement control, the standards of China and Serbia are similar. And the Chinese standards have made more detailed classification and design provisions, which are applicable in Serbia. (3) The standards of China and Serbia are two sets of different design methods and theories in the design of retaining structures. The Chinese standard adopts the combination of allowable stress method and limit state method for the design of retaining structures. The safety factor and partial factor are summarized from the continuous practice in the process of railway construction in China, but lacking the experience of application in Serbia. (4) The research results can provide reference for the application of Chinese standards in the design of Serbian railway subgrade.
		2022 Vol. 39 (6): 56-60 [Abstract] ( 2929 ) HTML (0 KB) PDF (485 KB) ( 1909 )

Main Line: Railway and Rail

	61	Research on the Influence of Height Difference of Piers on the Welded Turnout on Bridge under Temperature Action
		LIN Hongsong, XU Hao, CAO Bao, PAN Zili
		Research purposes: In order to study the influence of the pier height difference on the welded turnout on the continuous bridge under the temperature change, this paper takes No.18 turnout on a (40+56+40) m continuous bridge as the research object, establishes the turnout-bridge-pier calculation model, and studies the influence of vertical deformation caused by the height difference of adjacent bridge piers on the stress and irregularity of the welded turnout on the bridge under the action of temperature. Research conclusions: (1) The temperature rise of bridge pier has basically no effect on the force of welded turnout on the bridge, but has a greater impact on the vertical track irregularity of turnout area. (2) The expansion force of the welded turnout on the bridge increased by 0.54% when the pier temperature rises by 30 ℃. Therefore, the effect of the high difference of the bridge pier could not be considered when checking the longitudinal force of the welded turnout on the bridge. (3) With the increase of pier height difference between adjacent piers of the turnout bridge, the vertical deformation of the rail increases, and the vertical track irregularity deviation on the turnout area increases. (4) When the pier height difference between adjacent piers exceeds 76 m, the vertical track irregularity deviation exceeds the limit of 2 mm using the 10 m string positive sag difference evaluation. (5) The research results could provide reference for the design of welded turnout on continuous bridge with high piers.
		2022 Vol. 39 (6): 61-66 [Abstract] ( 2386 ) HTML (0 KB) PDF (521 KB) ( 1925 )

	67	Research on the Design Parameters and Experiment Methods of Fastening System for Medium and Low Speed Maglev Track
		HU Lianjun, CAI Wenfeng, ZHANG Weifeng
		Research purposes: At present, the medium and low speed maglev lines in China and abroad are relatively short, and the research on maglev fastening system focuses on the scheme and structural design, and lacks corresponding parameter research, type selection analysis, test methods, etc. Combined with the force and structural characteristics of medium and low speed maglev track, the main performance and parameters of fastening system are studied, the use of fastening system on maglev lines is analyzed and sorted. According to the relevant standards of railway fasteners, the assembly test method is proposed. The problems to be solved in engineering application are put forward, which provides suggestions for the development of medium and low speed maglev fastening system. Research conclusions: (1) The fastening system for medium and low speed maglev track should have sufficient anti-creeping resistance, good three-dimensional adjustment capability, reasonable stiffness, convenient maintenance, etc. (2) The selection of fastening system should be comprehensively considered according to the line engineering conditions, in combination with distance adjustment capacity, fastener type and reliability, maintenance and repair, etc. (3) With reference to the railway rail fastening system, the assembly performance experiment of maglev fasteners are carried out. After 3 million fatigue tests, the components are not damaged, and all the indicators meet the requirements. (4) According to the characteristics of the maglev system, it is necessary to further study the multiple technical problems existing in the fastening system to improve its service performance. (5) The research results can provide reference for the research and design of fastening system for medium and low speed maglev track.
		2022 Vol. 39 (6): 67-72 [Abstract] ( 2301 ) HTML (0 KB) PDF (794 KB) ( 2019 )

Main Line: Communication Signals

	73	Research on the Wireless Communication System for Multi-station Flat Shunting
		WANG Guoyu
		Research purposes: In some local railways, enterprises or logistics park special lines and port distribution railways, flat shunting operations at multiple stations and transfer train running operation coexist. The two kinds of operations require the corresponding wireless communication system to provide technical support. At present, the scheme of setting up both a flat shunting digital wireless communication system and a special mobile communication system is mostly adopted, which can meet the requirements, but the investment is relatively high. In order to save the project construction cost and simplify the equipment configuration, it is very necessary to study adopting a set of wireless communication system to meet the needs of flat shunting communication service and wireless dispatching communication service of multiple shunting stations and transfer train running sections at the same time. Research conclusions: (1) The wireless communication system for multi-station flat shunting follows the technical system and working frequency band of the existing flat shunting digital wireless communication system, which accords with current technology policy. (2) Multiple digital repeaters based on digital mobile radio (DMR) co-frequency relay technology are adopted to expand the wireless signal originally used for covering flat shunting operation in the station to each station and section within the operation scope by means of IP interconnection, so as to realize unified wireless signal coverage in multiple shunting stations and transfer train running sections and eliminate wireless signal blind areas. (3) Through simulation, it is verified that the audio receiving and demodulation circuit of the system terminal equipment can separate the co-frequency interference signal and suppress the co-frequency interference by using ICA algorithm. (4) The research results can provide reference for the engineering design of local railways, enterprises or logistics park special lines and port distribution railways, as well as the manufacturing of wireless communication system equipment for multi-station flat shunting.
		2022 Vol. 39 (6): 73-77 [Abstract] ( 2166 ) HTML (0 KB) PDF (1078 KB) ( 1919 )

Main Line: Electrification Engineering

	78	Research on the Corrosion Prevention of OCS Parts under Complex Environmental Conditions
		YU Gang
		Research purposes: A plateau railway recently started has high relative humidity, which puts forward higher requirements for the anti-corrosion of OCS parts due to the influence of cargo dust in the tunnel and poor equipment maintenance conditions in plateau areas. This paper studies and tests the corrosion influencing factors, adaptability of common anti-corrosion measures and OCS and zinc-nickel infiltration technology of OCS parts, so as to provide reference for the anti-corrosion design of OCS parts in high humidity area of plateau. Research conclusions: (1) The anti-corrosion performance of OCS parts is greatly affected by relative humidity, air temperature, atmospheric medium and other factors. OCS parts in the tunnel are more likely to be corroded due to the joint influence of atmosphere, groundwater and soil. (2) At present, steel OCS parts are treated with hot-dip galvanizing for corrosion protection. A few special work sites have studied and adopted measures such as increasing composite coating, Dacromet corrosion protection. However, affected by the working environment and characteristics of OCS parts, it has great limitations. (3) The anti-corrosion technology of zinc-nickel infiltration coating has the characteristics of high corrosion resistance and high wear resistance. Compared with traditional hot-dip galvanized parts, the anti-corrosion life can be increased by 147%. (4) Relevant technologies and their application in railways in plateau high humidity areas can greatly improve the anti-corrosion performance of OCS parts.
		2022 Vol. 39 (6): 78-83 [Abstract] ( 2893 ) HTML (0 KB) PDF (661 KB) ( 1958 )

Information Technology

	84	Research on the Key Technologies of BIM Design System for Railway Stations
		LIU Lingwei
		Research purposes: In terms of BIM design for railway stations, commercial BIM software generally has some problems, such as insufficient station design function, more repetitive operations, insufficient precision of model, unable to accurately express local details, which greatly restricts the application of BIM in railway station design. By analyzing the characteristics of railway station BIM design, the paper discusses the key technologies of railway station BIM design system from system architecture, function design, parametric modeling, attribute binding and model integration, in order to solve the shortcomings of commercial BIM software and realize the efficient BIM design of railway station. Research conclusions: (1) According to the characteristics of BIM design of station, based on the in-depth study of BIM modeling principle, the method of BIM modeling of station is proposed. (2) By adopting the idea of hierarchical architecture, the BIM design system of railway station is developed on Bentley MicroStation platform, and the parametric modeling of BIM model of railway station is realized. (3) The application in the project shows that the system is not only accurate in calculation, but also stable, reliable, simple and easy to use, which can greatly improve the efficiency of railway station BIM design.
		2022 Vol. 39 (6): 84-89 [Abstract] ( 2966 ) HTML (0 KB) PDF (1301 KB) ( 1992 )

	90	Application of Prefabricated BIM Technology in the Whole Life Cycle of Building
		REN Xingchen
		Research purposes: The research on prefabricated BIM technology is often limited to the design or construction stage, and the application of prefabricated BIM technology in the whole life cycle stage from design to construction and final operation and maintenance is still lacking. This paper introduces the technical route of the application of prefabricated BIM technology in the whole life cycle stage: that is to develop component library platform to facilitate the management of PC component family library; to develop BIM mold plug-in, and carry out three-dimensional visual collaborative design of assembled BIM technology; comprehensive application of PKPM-BIM collaborative platform and Navisworks software to deepen the design and processing of prefabricated components; the application of Pinming HiBIM software for electromechanical deepening design; to establish BIM model, and combine BIM+ construction management platform for BIM application in construction stage; to develop operation and maintenance platform for operation and maintenance BIM application. Research conclusions: (1) BIM application requires all parties to unify data format or develop BIM information platform to improve the fluidity of BIM data. (2) Comprehensive application of existing BIM software and self-developed BIM software can be very good for prefabricated BIM application, proving that BIM technology is a method that can timely optimize the design scheme, optimize the construction, and facilitate the later operation and maintenance. (3) Each participant in the project should develop BIM software and platform suitable for them according to the project demand system step by step. It is a good development idea to reserve the interface for later development and data communication with other participants.
		2022 Vol. 39 (6): 90-94 [Abstract] ( 3572 ) HTML (0 KB) PDF (926 KB) ( 2162 )

Engineering Economy and Management

	95	Technical and Economic Research on the Efficiency Reduction and Cooling Measures in High Geothermal Tunnel in Yuxi-Mohan Railway
		LI Zhun
		Research purposes: Correct construction methods for high geothermal tunnel sector and reasonable investment are key considerations of designers in railway construction. This paper introduces a comprehensive technical and economic research on seven high geothermal tunnels in Yuxi to Mohan railway, including service gallery and single, double, triple line main tunnels. Labor cost, material and machine shift consumption are measured under certain construction parameters, technological process, technical requirements, using realistic statistical method and field measurement method. Supplementary quota of cooling measures and efficiency reduction rate of labor and machine are also analyzed afterwards, which will provide reference for perfecting the budgeting system of similar projects. Research conclusions: (1) The consumption of labor cost, material and machine is counted, and the supplementary quota of cooling measures and the efficiency reduction rate of labor and machine in the section of high temperature are obtained. (2) Under the construction condition of grade Ⅳ surrounding rock of single-line tunnel with high ground temperature, the efficiency reduction coefficients of gradeⅠ, Ⅱ and Ⅲ are 1.256, 1.405 and 1.699. (3) The construction organization model of tunnel construction under high temperature environment is established, and the increase rate of special cooling measures for normal temperature section and high temperature section tunnel can be finally calculated. (4) The supplementary quota, efficiency reduction rate and construction organization model can provide reference for subsequent railway projects.
		2022 Vol. 39 (6): 95-99 [Abstract] ( 2275 ) HTML (0 KB) PDF (380 KB) ( 1946 )

	100	Experience, Reference and Inspiration of European High-speed Railway Construction Management Mode
		QIN Baolai, SUN Shigang, CHENG Bin
		Research purposes: In recent years, with the continuous expansion of high-speed railway construction scale in China, the problems such as the shortage of construction funds and the single construction mode have become increasingly prominent. In Europe, the high-speed railway construction management mode is generally diversified and the participation of social capital is high. By learning from the successful experience of Europe, we can innovate the management mode of high-speed railway construction in China and promote the further development of China's high-speed railway industry. Research conclusions: (1) By summarizing and analyzing the characteristics and development experience of the European high-speed railway construction management mode, this paper puts forward some suggestions on the development of China's high-speed railway construction management mode from six aspects, such as establishing and perfecting relevant systems, laws and regulations, perfecting the financial and insurance system, strengthening the training of professional talents and professional institutions, accelerating the transformation of government functions, speeding up the reform of railway investment and financing system, and improving the overall capacity of railway enterprises. (2) The research results can be used for reference in the innovative development of high-speed railway construction management mode in China.
		2022 Vol. 39 (6): 100-103 [Abstract] ( 2327 ) HTML (0 KB) PDF (468 KB) ( 1952 )