Shaking table experiments on seismic response of a shield-enlarge-dig type subway station structure in liquefiable ground
AN Junhai1，2，TAO Lianjin1，2，WANG Huanjie1，2，LI Jidong3
(1. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education，Beijing University of Technology，Beijing 100124，China；2. Center of Cooperative Innovation for Beijing Metropolitan Transportation，Beijing 100124，China；3. China State Construction Technical Center，Beijing 101300，China)
Abstract：A shaking table experiment was conducted on a shield-enlarge-dig type structure in liquefiable ground subjected to the near and far field earthquakes respectively. The lateral deformation，the pore pressure ratio，the earth pressure of soil foundation，the accelerations of soil and structure and the strains of structure of subway station were analyzed. The results showed that liquefiable foundation experienced two physical process in earthquake，the loose sand compacted firstly and then moved upwardly. There were phenomena of sand erupting and water oozing in large area after the high intensity earthquake. The shear deformation occurred in the lateral side of the soil and the peak displacements swing left and right asymmetrically. The acceleration amplification factor of soil foundation increased gradually from the bottom to the surface when the small earthquake(peak acceleration was 0.1 g and 0.2 g) was input while it showed an increasing trend when a moderate or strong earthquake was input from the shaking table. A notable phenomenon of high frequency filtering and low frequency amplification appeared in the process of seismic wave propagation from the bottom to the surface of soil. The pore water pressure experienced mainly two stages，the pore water pressure increased slowly at first， rose sharply then at the second stage. The existence of the underground structure has an inhibitory effect on the growth of the pore water pressure of foundation. The earth pressure increased and the structure itself in the elastic state entered into the plastic state gradually with the increase of input vibration intensity. The difference between the upper and lower ground pressures of the underground structure was the intrinsic factor that caused the model structure to generate an upward movement. The earthquake damage of the underground subway station of shield-enlarge-dig type in liquefiable ground experienced three stages：firstly，a shear failure occurred on the column and a damage on the opening position and spandrel of the tunnel；secondly，the connection parts of the side wall and roof had the tensile damage；finally，the underground structure collapsed.
安军海1，2，陶连金1，2，王焕杰1，2，李积栋3. 可液化场地下盾构扩挖地铁车站结构地震破坏机制振动台试验[J]. 岩石力学与工程学报, 2017, 36(8): 2018-2030.
AN Junhai1，2，TAO Lianjin1，2，WANG Huanjie1，2，LI Jidong3. Shaking table experiments on seismic response of a shield-enlarge-dig type subway station structure in liquefiable ground. , 2017, 36(8): 2018-2030.
[1] 蒋清国. 液化地层下地铁工程抗地震液化措施研究[J]. 震灾防御技术，2015，10(1)：95–106.(JIANG Qingguo. Anti-liquefaction measures for subway engineering in liquefiable soil layers[J]. Technology for Earthquake Disaster Prevention，2015，10(1)：95–106.(in Chinese))
[2] 陈 苏，陈国兴，戚承志，等. 可液化场地上三拱立柱式地铁地下车站结构地震反应特性振动台试验研究[J]. 岩土力学，2015，36(7)：1 989–1 914.(CHEN Su，CHEN Guoxing，QI Chengzhi，et al. A shaking table-based experimental study of seismic response of three-arch type?s underground subway station in liquefiable ground[J]. Rock and Soil Mechanics，2015，36(7)：1 989–1 914.(in Chinese))
[3] LU X，LI P，CHEN B，et al. Computer simulation of the dynamic layered soil pile structure interaction system[J]. Canadian Geotechnical Journal，2005，42(3)：742–751.
[4] 陈卫忠，宋万鹏，赵武胜，等. 地下工程抗震分析方法及性能评价研究进展[J]. 岩石力学与工程学报，2017，36(2)：310–320.(CHEN Weizhong，SONG Wanpeng，ZHAO Wusheng，et al. Research progress of seismic analysis methods and performance evaluation in underground engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(2)：310–320.(in Chinese))
[5] LIU H B，SONG E X. Seismic response of large underground structures in liquefiable soils subjected to horizontal and vertical earthquake excitations[J]. Computers and Geotechnics，2005，32(4)：223–244.
[6] 刘华北，宋二祥. 饱和可液化土中地下结构在震后固结中的响 应[J]. 岩土力学，2007，28(4)：705–710.(LIU Huabei，SONG Erxiang. Post-earthquake response of underground structures in saturated liquefiable soils[J]. Rock and Soil Mechanics，2007，28(4)：705–710.(in Chinese))
[7] 吕西林，任红梅，李培振. 液化场地自由场体系的数值分析及振动台试验验证[J]. 岩石力学与工程学报，2009，28(增2)：4 046–4 052. (LV Xilin，REN Hongmei，LI Peizhen. Numerical analysis of free field system in liquefiable site and validation of shaking table tests[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.2)：4 046–4 052.(in Chinese))
[8] 张之颖，吕西林，陈跃庆，等. 黏性土覆盖层下土中超孔隙水压力的动力试验研究[J]. 岩石力学与工程学报，2003，22(1)：131–136.(ZHANG Zhiying，LU Xilin，CHEN Yueqing，et al. Experimental study on excess pore water pressure of soils covered by clay layer[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(1)：131–136.(in Chinese))
[9] 何剑平，陈卫忠. 地下结构碎石排水层抗液化措施数值试验[J]. 岩土力学，2011，32(10)：3 177–3 184.(HE Jianping，CHEN Weizhong. Numerical experiment of anti-liquefaction measure with gravel stone drainage layer around underground structure[J]. Rock and Soil Mechanics，2001，32(10)：3 177–3 184.(in Chinese))
[10] CHIAN S C，MADABHUSHI S P G. Effect of buried depth and diameter on uplift of underground structures in liquefied soils[J]. Soil Dynamic sand Earthquake Engineering，2012，41(3)：181–190.
[11] TAMARI Y，TOWHATA I. Seismic soil-structure interaction of cross sections of flexible underground structures subjected to soil liquefaction[J]. Soils and Foundations，2003，43(2)：69–87.
[12] 孙海峰. 地下结构地震破坏机制研究[博士学位论文][D]. 廊坊：中国地震局工程力学研究所，2011.(SUN Haifeng. Study on earthquake damage mechanism of underground structures[Ph. D. Thesis][D]. Langfang：Institute of Engineering Mechanics，China Earthquake Administration China，2011.(in Chinese))
[13] 陈国兴，左 熹，王志华，等. 近远场地震作用下液化地基上地铁车站结构动力损伤特性的振动台试验[J]. 土木工程学报，2010，43(12)：120–126.(CHEN Guoxing，ZUO Xi，WANG Zhihua，et al. Large scale shaking table test study of the dynamic damage behavior of subway station structures in liquefiable foundation under near-fault and far-field ground motions[J]. China Civil Engineering Journal，2010，43(12)：120–126.(in Chinese))
[14] 陈国兴，陈 苏，杜修力，等. 城市地下结构抗震研究进展[J].防灾减灾工程学报，2016，36(1)：1–23.(CHEN Guoxing，CHEN Su，DU Xiuli，et al. Review of seismic damage，model test，available design and analysis methods of urban underground structures：retrospect and prospect[J]. Journal of Disaster Prevention and Mitigation Engineering，2016，36(1)：1–23.(in Chinese))
[15] 陈国兴. 岩土地震工程学[M]. 北京：科学出版社，2007：591–603.(CHEN Guoxing. Geotechnical earthquake engineering[M]. Beijing：Science Press，2007：591–603.(in Chinese))
[16] 何 川，封 坤，方 勇. 盾构法修建地铁隧道的技术现状与展望[J]. 西南交通大学学报，2015，50(1)：97–108.(HE Chuan，FENG Kun，FANG Yong. Review and prospects on constructing technologies of metro tunnels using shield tunneling method[J]. Journal of Southwest Jiaotong University，2015，50(1)：97–108.(in Chinese))
[17] 刘维宁，路美丽，张新金. 盾构法和浅埋暗挖法结合建造地铁车站的模型试验[J]. 岩石力学与工程学报，2009，28(8)：1 629–1 639. (LIU Weining，LU Meili，ZHANG Xinjin. Model test on metro station constructed by combination of shield method and shallow-buried tunneling method[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 629–1 639.(in Chinese))
2017, Vol. 36 
