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2022 Vol. 39, No. 12
Published: 2022-12-15
Information Technology
Main Line:Engineering Geology and Subgrade
Main Line:Railway and Rail
Main Line:Bridge Engineering
Main Line:Tunnel Engineering
Main Line:Survey and Design
Main Line:Communication Signals
 
       Main Line:Survey and Design
1 The Comprehensive Investigation Technology of "Space-sky-ground-well" for Railway in Difficult Mountainous Areas
XIE Yi, WANG Dong, ZHANG Guangze, XU Zhengxuan, ZHANG Rui, LI Weile, FENG Tao, LI Jiayu
Research purposes: The accuracy of railway survey is restricted by the influence of terrain, climate and complex geological conditions in difficult and dangerous mountainous areas in the western China. The previous research is only a simple combination of sky and earth technology, and the comprehensive application of the method is not discussed enough. Based on the key problems and actual needs of railway survey in western mountainous areas, this research puts forward a four-dimensional survey system integrating the identification of geological body's temporal and spatial evolution process, to provide reference for scientific research and survey work in the field of railway survey in western mountainous areas.
Research conclusions: (1) A set of four-dimensional survey system of "space-sky-ground-well" is constructed, which promotes the traditional current survey to the survey of geological body catastrophe evolution. (2) The technical combination principle of "space-sky-ground-well" under different geological problems is described in detail. (3) The "space-sky-ground-well" integrated survey technology will greatly improve the survey accuracy of lithology, structure, geological hazards and deep geological characteristics in western mountainous areas. This technology will be widely used in railway survey in complex and dangerous mountainous areas.
2022 Vol. 39 (12): 1-5 [Abstract] ( 4501 ) HTML (1 KB)  PDF  (1170 KB)  ( 1865 )
6 Application of Remote Sensing Technology in Karst Railway Engineering Geological Survey
LIU Guiwei, WANG Yanhui, CHANG Tianlong, SUN Qihao, ZHANG Xuanyu
Research purposes: Karst is widely distributed and strongly developed in mountainous areas of South China, which presents complexity and concealing characteristics. It is easy to induce tunnel water inrush and other risks, posing a great threat to railway construction safety. Taking Guangzhou-Qingyuan-Yongzhou Railway as an example, this paper uses three-dimensional remote sensing and GIS spatial analysis technology to find out macro-hydrogeological features such as geological structure and karst landform based on multi-source remote sensing data, and calculates the catchment area of tunnel in karst area, which provides scientific reference for route selection design and karst disaster prevention.
Research conclusions: (1) Most of the fault structures along the line are concentrated in the Lanshan-Lianzhou section, and 138 fault structures and 9 folds are identified by remote sensing interpretation. The fault structures are mainly S-N trending, and the folds are NE-NNE trending. (2) Karst depressions, residual hills and solitary peaks are developed, and several underground river outlets are exposed, most of which show the characteristics of beheaded river. (3) By selecting the influencing factor of water catchment area, generating the minimum gully catchment area, optimizing the water catchment unit and classifying the area with the same karst development degree, the calculated water catchment area of the karst tunnel is 56.83 km2, which provides an important parameter for the calculation of water inflow of the karst tunnel. (4) The research results can be applied to railway engineering geological survey in karst area.
2022 Vol. 39 (12): 6-10 [Abstract] ( 3874 ) HTML (1 KB)  PDF  (1357 KB)  ( 1773 )
11 Research on the Engineering Investigation and Influence of Kilometer Buried Goaf Adjacent to High-speed Railway
SUN Honglin, HU Qingbo, YAN Dong
Research purposes: Railway engineering route selection, construction and normal use are seriously restricted and affected by goaf. The investigation technology and engineering impact evaluation method for the kilometer depth of goaf need further exploration and practice in high-speed railway of China. This paper is based on high-speed railway adjacent to kilometer depth of the Gucheng coal mine goaf. The comprehensive survey technology combined with various methods such as coal mining engineering data collection, surface survey, two deep-source geophysical explorations of controlled source audio magnetotelluric and wide line seismic reflection, and InSAR interpretation, the space position and boundary conditions of ultra-deep buried goaf are identified. The engineering influence of goaf is comprehensively analyzed and evaluated by comprehensive selection of rock movement boundary angle, calculation of influence range, timeliness analysis of surface deformation and deformation monitoring verification. The comprehensive investigation technology and impact analysis method of ultra-deep buried goaf can be improved through the research.
Research conclusions: (1) The goaf boundaries obtained by the methods of mining engineering data collection, field investigation, deep source geophysical exploration, and InSAR interpretation have good consistency and conformity. (2) The boundary angle of rock movement of kilometer-level buried coal mine goaf should be reasonably selected by various methods, such as field measurement method, the specification method, engineering analogy method and probability integration inversion method. (3) The space-time effect analysis and monitoring results show that the goaf has been in a stable stage and hasn't basically affected the safety and stability of railway engineering. (4) The research conclusions can provide reference for engineering investigation and influence evaluation of ultra-deep buried goaf.
2022 Vol. 39 (12): 11-16 [Abstract] ( 3851 ) HTML (1 KB)  PDF  (1717 KB)  ( 1873 )
17 Research on the Route Selection and Prevention Measures for Railways Passing through Solution Mining Goafs
LI Weidong
Research purposes: The salt mine with a depth of 500 m underground was mined by water solution method in Central-south China, and the deformation of the surface in the goaf area is serious. The outer line of the railway hub was designed to pass through the mining area with great engineering risks. Based on the measured deformation data of the surface, this paper studied the law of ground deformation induced by water mining, analyzed the risk of ground collapse with the dome of natural equilibrium and geophysical methods, determined a reasonable line channel, and proposed the comprehensive prevention measures for the railway crossing the deep buried water-soluble goaf.
Research conclusions: (1) There were two subsidence centers with cumulative subsidence of 927 mm and 843 mm on the surface. The subsidence center was located on the ore pillar, and the goaf area had been connected. (2) The risk of the overlying rock collapsing to the ground was high in the south passage. However, only parts of the shafts in the north passage were broken and lost, and the engineering geological conditions were relatively good. And the north passage was selected as the final railway passage. (3) It was predicted that the duration of ground surface movement after the mining stop was shorter than the construction period, and comprehensive treatment measures such as mining stoppage, well closure, and roadbed subsidence widening in the mining area were proposed. The ground deformation tracking monitoring showed that the comprehensive treatment effect was excellent. (4) The maximum post-construction settlement of the line predicted by the Poisson function was 4.1 cm, which met the conditions for opening to traffic. The railway line was officially opened to traffic in August 2020. (5) The research results can provide reference for railway route selection and treatment in similar complex goafs.
2022 Vol. 39 (12): 17-23 [Abstract] ( 3822 ) HTML (1 KB)  PDF  (1705 KB)  ( 1778 )
       Main Line:Engineering Geology and Subgrade
24 Analysis and Study of the Key Technologies of Prefabricated Greening Retaining Wall for Railway Cutting
SI Wenming, ZHANG Xinsheng, TANG Yuanli, JIANG Chusheng, ZHAO Xiaoyan
Research purposes: Based on the construction site of the prefabricated greening retaining wall for the cutting slope of Luzhou Station of the South Sichuan intercity railway, this paper analyzes and studies the stress characteristics, displacement and deformation of the retaining wall structure by simulation, so as to determine the key technical parameters that are technically reasonable and economically feasible.
Research conclusions: (1) The prefabricated greening cutting retaining wall shall be assembled and constructed close to the excavated slope, and toe slabs and tenons shall be set if necessary. (2) When the toe slab width is 1 m, the wall displacement is significantly lower than that without toe slab. It is recommended that the toe slab width be set at 1~1.5 m. (3) The setting of anchor rod will significantly improve the stress and displacement of the prefabricated retaining wall. When the retaining wall is provided with anchor rods, the spacing of anchor rods has a great impact on the deformation and stability of the prefabricated cutting retaining wall. For the cutting slope of weathered mudstone, it is recommended that the vertical spacing of anchor rods be no more than 2.1 m. (4) The main performance of the wall is that the rib column is compressed, and significant stress concentration occurs at the connection between the rib column and the foundation slab. Therefore, the structural column reinforcement should be carried out reasonably, and the reinforcement design of the rib column at the foundation slab should be strengthened. (5) The research results have guiding significance in the popularization and application of cutting retaining engineering.
2022 Vol. 39 (12): 24-29 [Abstract] ( 3869 ) HTML (1 KB)  PDF  (1059 KB)  ( 1815 )
30 Characteristic Law of Filler after 100 Years of Cyclic Load
LI Fei
Research purposes: The characteristics of filler under long-term railway load are analyzed from three aspects: atmospheric influence depth, dynamic stress influence depth and settlement influence depth. The indoor model test of static and dynamic bearing capacity of typical subgrade bed filler is established, and the deformation characteristics of filler under cyclic load are analyzed. Through a large number of on-site light dynamic penetration, heavy dynamic penetration, drilling, excavation and other means, the characteristic law of the filler after 110 years of cyclic load is verified, and the state of the existing line foundation filler without obvious diseases is analyzed and evaluated.
Research conclusions: (1) After long-term load, the upper part of the subgrade forms a hard shell layer whose compactness is significantly higher than that of the lower soil. (2) The thickness of hard shell layer is the subgrade thickness corresponding to the attenuation of plastic strain along the depth of 20%. (3) The bearing capacity of hard shell increases with time. (4) The better the filler, the higher the bearing capacity of the hard shell layer. (5) The average bearing capacity of the hard shell layer is generally 1.1～1.3 times that of the underlying layer, and the lower the bearing capacity of the underlying layer, the greater the ratio of the bearing capacity of the hard shell layer to the underlying layer, and vice versa. (6) The research results can provide theoretical basis and data support for speed increase and reconstruction of existing lines.
2022 Vol. 39 (12): 30-34 [Abstract] ( 3855 ) HTML (1 KB)  PDF  (1459 KB)  ( 1759 )
       Main Line:Railway and Rail
35 Alignment Design of a South Asian Circular Railway Based on Analytic Hierarchy Process
WANG Dengpan, HUANG Boqing
Research purposes: In order to do an objective and reasonable design of the alignment selection of a circular railway in a country in South Asia, and provide a scientific basis for the owner's decision-making, the analytic hierarchy process was adopted, combined with the actual situation of the project site, from the four aspects of engineering, operation, social impact, and environment impact, 16 evaluation indicators such as main project cost and land acquisition were analyzed and identified, and a hierarchical structure model of railway alignment selection suitable for this country was established.
Research conclusions: (1) The hierarchical structure model is used to evaluate the various options of the circular railway, and the optimal scheme is selected by scoring and evaluating. (2) In the comparison of the alignment options, the demonstration result of the AHP is consistent with the plan finally adopted by the owner, which proves the effectiveness of the decision-making. (3) Using AHP to carry out railway alignment selection, according to the decomposition, comparative judgment, comprehensive way of thinking for decision-making, is an effective method to solve the multi-objective decision-making problem.(4) This paper can provide reference for the route selection of similar railway projects in South Asia.
2022 Vol. 39 (12): 35-40 [Abstract] ( 3850 ) HTML (1 KB)  PDF  (858 KB)  ( 1753 )
41 Research on the Influence of Pre-camber Setting of Large Span Cable-stayed Bridge for High-speed Railway on Ballastless Track Alignment Control
WANG Jundong
Research purposes: To address the problem that the vertical deformation of large span ballastless track cable-stayed bridges of 350 km/h high-speed railway is easy to exceed the limit, setting a reasonable pre-camber is one of the effective solutions. This paper uses 60 m chord measurement method and train behavior dynamic evaluation method to evaluate and analyze the alignment of the Baihe Yujiang Main Bridge of Nanning-Yulin High Speed Railway under different load combination deformation, and explores the influence of various pre-camber schemes on the alignment of large span ballastless rail cable-stayed bridge.
Research conclusions: (1) Concrete shrinkage and creep is the main factor affecting ballastless track alignment standard control, and sufficient observation period of settlement deformation should be ensured before construction of ballastless tracks. (2) Under the effect of all temperature load and creep, the pre-arch scheme of "taking the negative value of the vertical deformation caused by a train operating on the bridge" has the most significant effect on alignment standard control. (3) Setting the pre-camber can effectively increase the equivalent radius of curvature and reduce the centrifugal acceleration. (4) The most unfavorable position of the large-span cable-stayed bridge is at the tower and the middle of the main span, which needs to strengthen the construction quality control and observation and maintenance during the operation period. (5) The research results can provide reference for the design and construction of large span cable-stayed bridge.
2022 Vol. 39 (12): 41-48 [Abstract] ( 3857 ) HTML (1 KB)  PDF  (1079 KB)  ( 1817 )
49 Intelligent Fine Adjustment System for Track Slab Based on Wireless Data Interaction Mobile Terminal
LI Qiuyi, LI Luyao
Research purposes: At present high-speed railway ballastless track construction mainly uses artificial operation means in China, and it is difficult to meet the needs of intelligence and high quality development. The traditional track slab fine adjustment is realized based on industrial notebook computer, which is lack of portability and endurance, and the construction operation is not flexible. In order to realize the digitization and informatization of the track slab fine adjustment operation and improve the construction efficiency and laying accuracy of ballastless track, the track slab fine adjustment system is developed based on mobile terminal and wireless transmission mode.
Research conclusions: (1) The system is developed based on the mobile terminal and Android platform, uses GeoCom communication technology to open up the control interface with the measuring robot, and realizes wireless communication and automatic control with the measuring robot. (2) The data interface with construction board software is opened, realizes the automatic calculation of fine adjustment deviation, and completes the wireless upload of fine adjustment results to the track slab fine adjustment information platform. (3) The software realizes the fine adjustment of track slab under wireless control mode, effectively improves the measurement efficiency and ensures the fine adjustment quality of ballastless track slab. (4) The research results can provide digital equipment for the construction of ballastless track of high-speed railway, and provide technical support for the construction of intelligent railway.
2022 Vol. 39 (12): 49-53 [Abstract] ( 3938 ) HTML (1 KB)  PDF  (1061 KB)  ( 1785 )
       Main Line:Bridge Engineering
54 Research on the Durability Improvement Technology in the Negative Moment Regions of Steel-concrete Composite Continuous Beam
SUN Zonglei, AI Zongliang, ZHANG Yuhan
Research purposes: In order to further improve the structural durability, considering large dead load and live load of railway, taking 4×40 m railway steel-concrete composite continuous beam as an example, based on finite element analysis software Midas Civil, the feasibility and force behavior of uplift restricted-slip free studs of railway are studied.
Research conclusions: (1) After the use of uplift restricted-slip free studs in the negative moment regions, the deflection of structure, beam-end rotation angle and natural frequency are little variable compared with the conventional shear studs, which has only little impact on the overall performance of steel beam. (2) It is recommended to use uplift restricted-slip free studs at the range of 0.15L (L is the beam span) at both sides of the middle fulcrum. (3) The transition regions on both sides are actually constraint-strengthening regions, and it's necessary to pay special attention to the studs setting in this area, ensuring that the first row of studs of transition regions meet the requirements of strength and fatigue performance. (4) The arrangement of studs on the narrow flange of I section is limited, and it has poor adaptability to the transitional strengthening area which shall be set for the uplift restricted-slip free studs. (5) The research results can provide references for the durability improvement in the negative moment regions of steel-concrete continuous beam bridge of passenger and freight railway.
2022 Vol. 39 (12): 54-59 [Abstract] ( 3853 ) HTML (1 KB)  PDF  (1128 KB)  ( 1842 )
60 Overall Design of Yellow River Highway-railway Combined Super Large Bridge of Ji′nan-Binzhou Railway
FENG Yacheng,ZHANG Xiaokun,CHEN Yingtao,SUN Hongbin, LIU Hongxu,WU Wenhua
Research purposes: The construction environment of Ji'nan-Binzhou Railway Yellow River higway-railway combined super large bridge is complex. It crosses the Yellow River about 7 km away from Jinan Yaoqiang airport, and the downstream is only 2 km away from the existing Jiyang Yellow River highway bridge, the Yellow River is under great pressure to prevent ice and flood. At the same time, the river channel in this section is a class IV channel, and the layout of spans should meet the requirements of flood control and navigation, the maximum height of the bridge structure above the rail surface shall not exceed 52 m, so the choice of bridge types are very limited. Combined with the construction environment, bridge type selection, span layout, main bridge design and other achievements of the Yellow River highway-railway combined super large bridge of Ji'nan-Binzhou Railway, this paper focuses on the determination of the bridge span scheme and the design of the main bridge and approach bridge under complex boundary conditions.
Research conclusions: (1) (84+144+228+240+300+120+60) m asymmetric low pylon cable-stayed stiffening steel truss girder with four towers and three main spans is in line with the construction environment of the bridge site and meets the needs of flood control, navigation, highway and railway departments. (2) The unequal height bridge tower is well matched with the unequal span main span, which not only meets the requirements of aviation height limit, but also combines with the structural stress. (3) The 34.9 m super wide double main truss design and the structural treatment method of hollowing out on both sides of the railway bridge deck system ensure smooth force transmission and save project investment. (4) For the long-span, highway and railway heavy-duty bridge structure, the damper inclined layout design is adopted, which can solve the seismic problems in both vertical and horizontal directions at the same time. (5) The research results can provide reference for the design and construction of large-scale river crossing bridges under complex boundary conditions.
2022 Vol. 39 (12): 60-65 [Abstract] ( 3868 ) HTML (1 KB)  PDF  (1713 KB)  ( 1853 )
66 Algorithm and Control of Influence of Large Elevated Station Bridge on Settlement of Adjacent High-speed Railway
MENG Fanzeng
Research purposes: The modified fine layering summation method is used to predict the influence of construction of a large elevated station on the settlement of adjacent piers of high-speed railway in Beijing area, realizing the rapid prediction of settlement influence in construction process. First, based on the Saint Venant's Principle, the vertical load of the elevated station bridge pile foundation was simulated as a rectangle load with different positions and depths, and additional stress value was calculated using the Mindlin solution. Then, the soil hardening model is used to simulate the compressive stiffness of the soil and fit the compressive modulus. The equivalent pier method is further used to calculate the settlement effect. The calculated thickness of soil layer is 0.1~1.0 m. After verifying the algorithm with finite element method and field measured data, the settlement influence of subsequent construction was predicted, and balanced casting method and stack-load balancing method are proposed to control the influence of uneven settlement on the existing bridge.
Research conclusions: (1) The proposed algorithm required 1/14 of the calculation time of a finite element model of the same scale, and the maximum absolute error is 0.94 mm with the measured data, and the relative error is 12%, which meets the engineering requirements. (2) The construction control measures proposed are reasonable and effective, and have strong practicability, which can provide a reference for similar projects.
2022 Vol. 39 (12): 66-72 [Abstract] ( 3864 ) HTML (1 KB)  PDF  (1205 KB)  ( 1802 )
       Main Line:Tunnel Engineering
73 Dynamic Response Analysis of the Deep-buried and Heavy-haul Railway Tunnel Base with High Ground Stress
HAN Jiang
Research purposes: Under the long-term vibration of heavy-duty trains, the tunnel base structure is prone to cracking and damage. Such diseases are more serious in the base structure of deep-buried tunnels, and may even lead to the uplift and damage of the whole base, which seriously affects the safety of train operation. In order to reveal the dynamic response characteristics of the deep-buried railway tunnel base under the vibration of the heavy-duty train, a dynamic analysis model of the heavy-duty deep-buried railway tunnel was established by means of numerical simulation, and the stress and disease characteristics of the tunnel base structure in this environment were verified. Further combined with the actual project, the disease treatment measures and effects were proposed.
Research conclusions: (1) The base structure of the deep-buried tunnel bears much more than the principal stress value of the shallow-buried tunnel, and it is more likely to suffer from cracks, damage, uplift and other diseases under the cyclic load of the heavy-duty train. (2) Under the action of the heavy-duty train load, the dynamic displacement and dynamic stress of the tunnel base structure gradually decrease with the increase of the thickness of the bottom and the thickness of the invert. (3) Compared with the thickness of the bottom, the increase of the thickness of the invert is more conducive to the control of vertical displacement and stress of the support structure of heavy-haul railway tunnels under the action of cyclic loads, which are less prone to problems such as fatigue cracking. (4) The research results can be applied to the field of the design and disease treatment in deep-buried and heavy-haul railway tunnel.
2022 Vol. 39 (12): 73-78 [Abstract] ( 3974 ) HTML (1 KB)  PDF  (1098 KB)  ( 1778 )
79 Mechanical Characteristics of Prefabricated Inverted Arch during Hoisting in Mining Method Tunnel
WANG Fei
Research purposes: Prefabricated assembly structure has outstanding advantages of fast construction, high mechanization, easy quality control, etc. Although there are still some problems with full assembly lining in mining method tunnels, there are already tunnels using assembly lining in the inverted arch part to try. When using the integral inverted arch assembly lining, the volume and weight of individual inverted arch blocks are large, and the mechanical characteristics during prefabrication and hoisting should be studied. Taking single-line railway tunnel as the engineering background, the mechanical characteristics of prefabricated inverted arch blocks in the process of maintenance and hoisting were studied by full-scale test and numerical simulation.
Research conclusions: (1) The temperature inside the inverted arch block reaches the highest value after casting 12~24 h, due to the influence of hydration heat, and the maximum change value is 32.5 ℃. (2) The stress change of reinforcement and concrete during the maintenance period is mainly affected by the temperature change inside the inverted arch block, and the tensile stress of the roof plate concrete is generally greater than the tensile stress of the inverted arch concrete. (3) The concrete of the inverted arch block should take appropriate measures to reduce the hydration heat to avoid the excessive tensile stress of the inverted arch block during the maintenance period, resulting in surface cracking. (4) The stresses change of concrete and reinforcement is smaller during hoisting process, and the inverted arch block will not be damaged. (5) Maximum changes of the concrete compressive stress are on the upper side of the midpoint of the roof plate during hoisting, and maximum changes of the concrete tensile stress are underside of the midpoint of the inverted arch, and the concrete stress changes of the web and hoisting hole are smaller, and all changes values of measured basically match with the simulated. (6) The research results can provide reference for the design and prefabrication of inverted arch block and the determination of hoisting technology.
2022 Vol. 39 (12): 79-85 [Abstract] ( 3813 ) HTML (1 KB)  PDF  (1530 KB)  ( 1783 )
86 Analysis of Harmful Gas Characteristics in Tunnels in Southern Dabashan Area
ZHANG Yingxu, CHEN Minghao, SU Peidong, LI Yougui, TANG Tao
Research purposes: The geological conditions of southern Dabashan area are complex and the harmful gas develops in the strata. The harmful gas enriched seriously threatens the construction and operation of tunnel engineering. Based on the comprehensive utilization of regional structural data, stratigraphic data and oil and gas geological data, this paper studies the geological characteristics and harmful gas characteristics of southern Dabashan area. Combined with the exploration and gas testing results of Xi'an-Chongqing high speed railway, the distribution characteristics of different types of harmful gases in tunnels in southern Dabashan area are defined. This research has guiding significance for ensuring the smooth construction of southern Dabashan area tunnel of Xi'an-Chongqing high speed railway and similar cases in future projects.
Research conclusions: (1) The harmful gas types in southern Dabashan area are mainly coal seam gas and non coal harmful gas, and the main component of the gas is methane(CH4). (2) From the northeast to the southwest of southern Dabashan area, the harmfulness of harmful gas to the tunnel is gradually increasing. (3) The research results can provide reference for the study of tunnel harmful gas in similar strata and structural areas at the edge of Sichuan Basin.
2022 Vol. 39 (12): 86-90 [Abstract] ( 4234 ) HTML (1 KB)  PDF  (1168 KB)  ( 1782 )
       Main Line:Communication Signals
91 Exploration on the Future Trend of Signaling System for Heavy Haul Railway
WANG Haizhong
Research purposes: The current signaling system can not meet the increasing transportation demand of heavy haul railway, the paper proposes the development trend and key technology of signaling system of heavy haul railway after analyzing the technical achievements abstracted from domestic and abroad typical signaling system, which can be taken as reference for signaling equipment development and technical solution selection.
Research conclusions: (1) The signaling system technology in foreign countries has made a big breakthrough, i.e., ETCS-2+ATO train control system applied in AutoHaul project in Australia has achieved GoA4 class automatic driving of heavy-haul railway. (2) The future trends of signaling system for heavy haul railway include: trackside equipment shall be as less as possible and onboard equipment shall integrate multiple functions; moving block and ATO shall be applied; intelligent and efficient traffic dispatching and maintenance shall be achieved. (3) The research results can provide reference for signaling equipment development and technical solution selection.
2022 Vol. 39 (12): 91-96 [Abstract] ( 3883 ) HTML (1 KB)  PDF  (955 KB)  ( 1842 )
       Information Technology
97 Research on the Integrated Digital Delivery of Railway BIM Design Results
ZHAO Feifei, SU Lin, QU Jiantao, YANG Xukun
Research purposes: Significant progress has been made in the digital modeling technology of railway, but the ecosystem of digital design and delivery of railway has not yet formed. Railway engineering including many domains, the existing BIM software has low integration efficiency for large-scale and multi-disciplinary models, and it is not easy to exchange data with other software. Therefore, it is urgent to research on the integrated digital delivery technology.
Research conclusions: (1) GIS can support large scene and multi-source data. Based on this, the integration of BIM and GIS was implemented and an integration system was developed using B/S mode reducing the hardware requirements for end users. (2) The system can visualize BIM design results from an overall perspective to realize integrated digital delivery combining micro and macro, and effectively solve the problem of railway engineering information transfer. (3) The system was used to integrate, check and optimize the design of Guangzhou-Zhanjiang high speed railway with 22 issues being found and the quality was improved.
2022 Vol. 39 (12): 97-103 [Abstract] ( 3925 ) HTML (1 KB)  PDF  (1727 KB)  ( 1892 )
104 Application of Real 3D Image Fusion in Completion Acceptance of High-speed Railway
WANG Kai
Research purposes: At present, the completion acceptance of high-speed railway mainly adopts manual on-site inspection, which has problems such as low efficiency, non intuitive acceptance archive data and difficulty in tracing. In view of the above problems, it is proposed to use high-precision 3D real scene to carry out the application of completion acceptance. The research mainly solves the bottleneck problem that a single real scene model cannot be directly applied to the project completion acceptance. Through data acquisition, 3D modeling, image fusion algorithm construction, visual software development and demonstration application of completion acceptance, the whole process of completion acceptance application of real scene 3D image fusion technology has been opened up.
Research conclusions: (1) The research shows that the UAV original image projection and dynamic fusion in high-precision 3D scene can be achieved by using the model and image fusion algorithm with accurate internal and external orientation elements as the data source. (2) The image fusion method based on the real scene model can meet the needs of preliminary appearance, quantitative geometric measurement and analysis, special renovation investigation and application in the railway completion acceptance under the virtual three-dimensional environment. (3) In addition to the application of high-speed railway completion acceptance, the model image fusion method can be applied to the disease detection, flood control and external environment troubleshooting of the operation line during the skylight period.
2022 Vol. 39 (12): 104-109 [Abstract] ( 4082 ) HTML (1 KB)  PDF  (1241 KB)  ( 1857 )
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