快速地铁列车荷载下软土地基沉降数值模拟研究
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摘要
地铁列车荷载作用下软土地基会产生沉降,如工后沉降和不均匀沉降等,影响其使用性能和使用寿命。为研究不同速度地铁列车荷载作用下软土地基的沉降特性,采用有限元软件ABAQUS建立三维动力有限元模型,对比分析了常规时速(80 km/h)和较快时速(120 km/h)下土体的沉降规律,并结合理论经验修改公式预测地铁运营工后沉降量。研究结果表明:列车运行速度越大,隧道下卧土体的波动越大,沉降曲线轮轨分布现象越明显,地表沉降槽的横向影响范围也越大,约为隧道轴线两侧各4.5倍隧道直径,但其工后沉降随地铁行车速度的增大而减小;在快速地铁列车荷载作用下土体竖向沉降的影响范围为3倍隧道直径;线路运营后一年沉降量约为57mm,占累积沉降量的30%,20年后的累计沉降量约为190 mm。
The soft soil foundation will have settlement under the action of subway train load, such as post-construction settlement and uneven settlement, which will affect its service performance and service life. In order to study the settlement characteristics of soft soil foundation under different speed subway train loads, the finite element software ABAQUS is used to establish a three-dimensional dynamic finite element model. The settlement laws of the soil at normal speed(80 km/h) and faster speed(120 km/h) are compared and analyzed, and by combining with the theoretical experience, the formula is modified to predict the post-construction settlement of the subway operation. The results show that, the greater the running speed of the train, the greater the fluctuation of the soil under the tunnel, the more obvious the distribution of the wheel-rail of the settlement curve, and the greater the lateral influence range of the surface settlement trough, which is about 4.5 times the diameter of the tunnel at both sides of the tunnel axis, but its post-construction settlement decreases with the increase of subway speed. The influences of vertical settlement of the soil under the action of fast subway train is 3 times the tunnel diameter. After the operation of the line, the settlement is about 57 mm in one year, accounting for 30% of the accumulated settlement, and the accumulated settlement after 20 years is about 190 mm..
The soft soil foundation will have settlement under the action of subway train load, such as post-construction settlement and uneven settlement, which will affect its service performance and service life. In order to study the settlement characteristics of soft soil foundation under different speed subway train loads, the finite element software ABAQUS is used to establish a three-dimensional dynamic finite element model. The settlement laws of the soil at normal speed(80 km/h) and faster speed(120 km/h) are compared and analyzed, and by combining with the theoretical experience, the formula is modified to predict the post-construction settlement of the subway operation. The results show that, the greater the running speed of the train, the greater the fluctuation of the soil under the tunnel, the more obvious the distribution of the wheel-rail of the settlement curve, and the greater the lateral influence range of the surface settlement trough, which is about 4.5 times the diameter of the tunnel at both sides of the tunnel axis, but its post-construction settlement decreases with the increase of subway speed. The influences of vertical settlement of the soil under the action of fast subway train is 3 times the tunnel diameter. After the operation of the line, the settlement is about 57 mm in one year, accounting for 30% of the accumulated settlement, and the accumulated settlement after 20 years is about 190 mm..
引文
[1]陈德智.广州地铁隧道运营期沉降监测及分析[J].都市快轨交通,2011,24(4):94-98.(CHEN De-zhi.Subsidence monitoring and analysis for guangzhou subway tunnels[J].Urban Rapid Rail Transit,2011,24(4):94-98.(in Chinese))
[2]张冬梅,李钰.地铁荷载引起的盾构隧道及土层长期沉降研究[J].防灾减灾工程学报,2015(5):563-567.(ZHANG Dong-mei,LI Yu.Long-term settlement of shield tunnel in soft clay due to vehicle vibration[J].Journal of Disaster Prevention and Mitigation Engineering,2015(5):563-567.(in Chinese))
[3]KAYNIA A M,MADSHUS C,ZACKRISSON P.Ground vibration from high-speed trains:prediction and countermeasure[J].Journal of Geotechnical and Geoenvironmental Engineering,2000,126(6):531-537.
[4]XIE Wei-ping,LUO Qiang,WANG Guo-bo.Elastic-plastic analysis of Foundation settlement caused by subway load[C]//The First International Symposium on Innovation&Sustainability of Modern Railway.Nanchang,2008:56-62.
[5]CARTER J P,BOOKER J R.Elastic consolidation around a deep circular tunnel[J].International Journal of Solids and Structures,1982,18(12):1059-1074.
[6]张学钢,黄阿岗,郭旺军.列车荷载长期作用下隧道地基固结变形的数值分析[J].铁道工程学报,2011(4):22-26.(ZHANG Xue-gang,HUANG A-gang,GUO Wang-jun.Numerical analysis of consolidation deformation of tunnel foundation under effect of long-term train load[J].Journal of Railway Engineering Society,2011(4):22-26.(in Chinese))
[7]黄茂松,姚兆明.循环荷载下饱和软黏土的累积变形显式模型[J].岩土工程学报,2011,33(3):325-331.(HUANGMao-song,YAO Zhao-ming.Explicit model for saturated clay behavior subjected to cyclic loading[J].Chinese Journal of Geotechnical Engineering,2011,33(3):325-331.(in Chinese))
[8]CHAI J C,MIURA N,ZHU H H,et al.Compression and consolidation characteristics of structured natural clay[J].Canadian Geotechnical Journal,2004,41(6):1250-1258.
[9]杨兵明.软土地层盾构隧道长期沉降规律及预测研究[J].铁道工程学报,2015,32(11):87-92.(YANG Bing-ming.Research on law and prediction of long-term settlement of shield tunnel in soft soil stratum[J].Journal of Railway Engineering Society,2015,32(11):87-92.(in Chinese))
[10]唐益群,栾长青,张曦,等.地铁振动荷载作用下隧道土体变形数值模拟[J].地下空间与工程学报,2008,4(1):105-110.(TANG Yi-qun,LUAN Chang-qing,ZHANG Xi,et al.Numerical simulation of saturated soft clay’s deformation around tunnel under subway vibrational loading[J].Chinese Journal of Underground Space and Engineering,2008,4(1):105-110.(in Chinese))
[11]FANG Y S,LIN J S,SU C S.An estimation of ground settlement due to shield tunneling by the Peck-Fujita method[J].Canadian Geotechnical Journal,1994,31(3):431-443.
[12]JIANG Zhou,GAO Guang-yun,ZHAO Hong,et al.Long-term settlement of tunnels induced by subway moving load in soft soil districts[J].Journal of Geotechnical Engineering,2013(35):301-307.
[13]高广运,徐大为,张先林,等.地铁循环荷载作用下上海软土路基的长期沉降计算[J].桂林理工大学学报,2012,32(3):370-374.(GAO Guang-yun,XU Da-wei,ZHANG Xian-lin,et al.Long-term settlement calculation of Shanghai metro soft soil foundation under cyclic loading[J].Journal of Guilin University of Technology,2012,32(3):370-374.(in Chinese))
[2]张冬梅,李钰.地铁荷载引起的盾构隧道及土层长期沉降研究[J].防灾减灾工程学报,2015(5):563-567.(ZHANG Dong-mei,LI Yu.Long-term settlement of shield tunnel in soft clay due to vehicle vibration[J].Journal of Disaster Prevention and Mitigation Engineering,2015(5):563-567.(in Chinese))
[3]KAYNIA A M,MADSHUS C,ZACKRISSON P.Ground vibration from high-speed trains:prediction and countermeasure[J].Journal of Geotechnical and Geoenvironmental Engineering,2000,126(6):531-537.
[4]XIE Wei-ping,LUO Qiang,WANG Guo-bo.Elastic-plastic analysis of Foundation settlement caused by subway load[C]//The First International Symposium on Innovation&Sustainability of Modern Railway.Nanchang,2008:56-62.
[5]CARTER J P,BOOKER J R.Elastic consolidation around a deep circular tunnel[J].International Journal of Solids and Structures,1982,18(12):1059-1074.
[6]张学钢,黄阿岗,郭旺军.列车荷载长期作用下隧道地基固结变形的数值分析[J].铁道工程学报,2011(4):22-26.(ZHANG Xue-gang,HUANG A-gang,GUO Wang-jun.Numerical analysis of consolidation deformation of tunnel foundation under effect of long-term train load[J].Journal of Railway Engineering Society,2011(4):22-26.(in Chinese))
[7]黄茂松,姚兆明.循环荷载下饱和软黏土的累积变形显式模型[J].岩土工程学报,2011,33(3):325-331.(HUANGMao-song,YAO Zhao-ming.Explicit model for saturated clay behavior subjected to cyclic loading[J].Chinese Journal of Geotechnical Engineering,2011,33(3):325-331.(in Chinese))
[8]CHAI J C,MIURA N,ZHU H H,et al.Compression and consolidation characteristics of structured natural clay[J].Canadian Geotechnical Journal,2004,41(6):1250-1258.
[9]杨兵明.软土地层盾构隧道长期沉降规律及预测研究[J].铁道工程学报,2015,32(11):87-92.(YANG Bing-ming.Research on law and prediction of long-term settlement of shield tunnel in soft soil stratum[J].Journal of Railway Engineering Society,2015,32(11):87-92.(in Chinese))
[10]唐益群,栾长青,张曦,等.地铁振动荷载作用下隧道土体变形数值模拟[J].地下空间与工程学报,2008,4(1):105-110.(TANG Yi-qun,LUAN Chang-qing,ZHANG Xi,et al.Numerical simulation of saturated soft clay’s deformation around tunnel under subway vibrational loading[J].Chinese Journal of Underground Space and Engineering,2008,4(1):105-110.(in Chinese))
[11]FANG Y S,LIN J S,SU C S.An estimation of ground settlement due to shield tunneling by the Peck-Fujita method[J].Canadian Geotechnical Journal,1994,31(3):431-443.
[12]JIANG Zhou,GAO Guang-yun,ZHAO Hong,et al.Long-term settlement of tunnels induced by subway moving load in soft soil districts[J].Journal of Geotechnical Engineering,2013(35):301-307.
[13]高广运,徐大为,张先林,等.地铁循环荷载作用下上海软土路基的长期沉降计算[J].桂林理工大学学报,2012,32(3):370-374.(GAO Guang-yun,XU Da-wei,ZHANG Xian-lin,et al.Long-term settlement calculation of Shanghai metro soft soil foundation under cyclic loading[J].Journal of Guilin University of Technology,2012,32(3):370-374.(in Chinese))