Lateral displacement and uplift of the subway station near the free face in liquefiable soils
HU Jilei1,2, ZHANG Zhen2, YANY Bing2
1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University), Ministry of Education, Yichang 443002, Hubei, China; 2. College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, Hubei, China
Abstract: To study the effects of different heights of the free face, seismic intensity, subway station burial depth, and horizontal distance from the station to the free face on the subway station in liquefied soil under bidirectional earthquake action, the finite element-finite difference coupled numerical method was used to analyze the seismic response characteristics and laws of the station structure near the free face in liquefiable soils. The results showed that: the existence of the free facewould cause the horizontal displacement and rotation of the subway station, and the accumulation and dissipation of the excess pore water pressure would make the subway station float up first and then settle down; the horizontal displacement, inter-story displacement angle, and settlement after pore pressure dissipation of the structure gradually increased with the increase of seismic intensity and free face height but decreased with the increase of horizontal distance between the station and the free face and the buried depth of the structure; the existence of the free face would reduce the floating of the subway station at the end of the earthquake, and the degree of reduction increased with the increase of the free face height but decreased with the increase of the horizontal distance between the station and the free face;the internal force of the wall near the free face of the structure was smaller than that of the non-free side wall, and the internal force difference increased with the increase of the free face height; increasing the buried depth of the subway station and the horizontal distance from the free face could effectively reduce the adverse effects of the free face on the structure.
胡记磊, 张缜, 杨兵. 临空液化场地中地铁车站侧移及上浮规律[J]. 隧道与地下工程灾害防治, 2023, 5(3): 52-62.
HU Jilei, ZHANG Zhen, YANY Bing. Lateral displacement and uplift of the subway station near the free face in liquefiable soils. Hazard Control in Tunnelling and Underground Engineering, 2023, 5(3): 52-62.
[1] 安军海, 闫宏锦, 赵志杰, 等. 地铁车站结构上穿可液化土层地震响应分析[J]. 科学技术与工程, 2022, 22(17):7080-7088. AN Junhai, YAN Hongjin, ZHAO Zhijie, et al. Seismic response analysis of liquefiable soil layer on subway station structure[J]. Science Technology and Engineering, 2022, 22(17):7080-7088. [2] 李洋, 许成顺, 杜修力. 阪神地震中大开地铁车站和区间隧道破坏差异成因研究[J]. 防灾减灾工程学报, 2020, 40(3):326-336. LI Yang, XU Chengshun, DU Xiuli. Causal analyses of different degree of earthquake damage occurred on Daikai Subway Station and its running tunnels during Kobe Earthquake[J]. Journal of Disaster Prevention and Mitigation Engineering, 2020, 40(3):326-336. [3] 禹海涛, 王祺, 刘涛. 均质地层长隧道纵向地震响应解析解[J]. 隧道与地下工程灾害防治, 2020, 2(1):34-41. YU Haitao, WANG Qi, LIU Tao. Analytical solution of longitudinal seismic response of long tunnels in homogeneous stratum[J]. Hazard Control in Tunnelling and Underground Engineering, 2020, 2(1):34-41. [4] 赵密, 李旭东, 高志懂,等. 地震作用下土-深埋地下结构相互作用的高效时程分析方法[J]. 防灾减灾工程学报, 2021, 41(1):39-45. ZHAO Mi, LI Xudong, GAO Zhiqiao, et al. Efficient analysis for seismic soil-structure interaction with deep burial depth[J]. Journal of Disaster Prevention and Mitigation Engineering, 2021, 41(1):39-45. [5] 于仲洋, 张鸿儒, 邱滟佳,等. 地震作用下相邻地下结构与土相互作用特性研究[J]. 地震工程学报, 2020, 42(2):481-489. YU Zhongyang, ZHANG Hongru, QIU Yanjia, et al. Neighboring underground structure-soil interaction characteristics under seismic action[J]. China Earthquake Engineering Journal, 2020, 42(2):481-489. [6] 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):95-107. JIANG Qingguo. Anti-liquefaction measures for subway engineering in liquefiable soil layers[J]. Technology for Earthquake Disaster Prevention, 2015, 10(1):95-107. [7] 王胜平, 阎高翔. 南京地铁一号线许府巷-南京站盾构区间地震液化分析[J]. 现代隧道技术, 2001, 38(2):19-23. WANG Shengping, YAN Gaoxiang. Analysis on earthquake-caused ground liquefying in shield-driven tunnel section from Xufuxiang Station to Nanjing Station, Nanjing metro[J]. Modern Tunnelling Technology, 2001, 38(2):19-23. [8] 刘春晓. 可液化土层分布对土-地铁地下结构地震响应影响的振动台试验研究[J]. 中国铁道科学, 2021, 42(5):30-40. LIU Chunxiao. Shaking table test on influence of liquefiable soil distribution on seismic response of soil and subway underground structures[J]. China Railway Science, 2021, 42(5):30-40. [9] YASUDA S, NAGASE H, KIKU H, et al. The mechanism and a simplified procedure for the analysis of permanent ground displacement due to liquefaction[J]. Soils and Foundations, 1992, 32(1):149-160. [10] 胡记磊, 唐小微, 白旭, 等. 含倾斜砂土夹层的人工岛地震液化灾害分析[J]. 大连理工大学学报, 2015, 55(5):504-510. HU Jilei, TANG Xiaowei, BAI Xu, et al. Analyses of seismic liquefaction induced disaster in artificial island with sloping sand layer[J]. Journal of Dalian University of Technology, 2015, 55(5):504-510. [11] ZHUANG Haiyang, WANG Xu, MIAO Yu, et al. Seismic responses of a subway station and tunnel in a slightly inclined liquefiable ground through shaking table test[J]. Soil Dynamics and Earthquake Engineering, 2019, 116:371-385. [12] 庄海洋, 付继赛, 陈苏, 等. 微倾斜场地中地铁地下结构周围地基液化与变形特性振动台模型试验研究[J]. 岩土力学, 2019, 40(4):1263-1272. ZHUANG Haiyang, FU Jisai, CHEN Su, et al. Liquefaction and deformation of the soil foundation around a subway underground structure with a slight inclined ground surface by the shaking table test[J]. Rock and Soil Mechanics, 2019, 40(4):1263-1272. [13] LITTLE M, RATHJE E. Key trends regarding the effects of site geometry on lateral spreading displacements[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2021, 147(12):04021142-04021154. [14] OKA F, YASHIMA A, SHIBATA T, et al. FEM-FDM coupled liquefaction analysis of a porous soil using an elasto-plastic model[J]. Applied Scientific Research, 1994, 52(3):209-245. [15] AKAI K, TAMURA T. Numerical analysis of multi-dimensional consolidation accompanied with elastic-plastic constitutive equation[J]. Proceedings of the Japan Society of Civil Engineers, 1978(269):95-104. [16] NEWMARK N M. A method of computation for structural dynamics[J]. Journal of the Engineering Mechanics Division, 1959, 85(3):67-94. [17] LU Chih-wei, GUI Meen-wah, LAI Shing-Cheng. A numerical study on soil-group-pile-bridge-pier interaction under the effect of earthquake loading[J]. Journal of Earthquake and Tsunami, 2014, 8(1):1350037-1-1350037-35. [18] HU Jilei, CHEN Qihua, LIU Huabei. Relationship between earthquake-induced uplift of rectangular underground structures and the excess pore water pressure ratio in saturated sandy soils[J]. Tunnelling and Underground Space Technology, 2018, 79:35-51. [19] HU Jilei, LIU Huabei. The uplift behavior of a subway station during different degrees of soil liquefaction[J]. Procedia Engineering, 2017, 189:18-24. [20] 邵琪.饱和砂土地震液化的网格自适应数值方法研究[D].大连:大连理工大学,2014. SHAO Qi. Study on adaptive remeshing numerical methods in seismic liquefaction of saturated sand[D]. Dalian:Dalian University of Technology, 2014. [21] 白旭, 唐小微, 胡记磊. 浅埋地铁车站的抗液化上浮改进措施数值分析[J]. 防灾减灾工程学报, 2019, 39(5):778-786. BAI Xu, TANG Xiaowei, HU Jilei. Numerical analysis of anti-liquefaction uplift of a shallow buried subway station in improved countermeasures[J]. Journal of Disaster Prevention and Mitigation Engineering, 2019, 39(5):778-786.