地裂缝场地地铁车站振动台试验和数值模拟研究  

SHAKING TABLE TEST AND NUMERICAL SIMULATION ON SUBWAY STATION IN GROUND FISSURE AREA

作　　者：陈轩[1,2,3] 熊仲明 陈帜[1,2,3] CHEN Xuan;XIONG Zhong-ming;CHEN Zhi(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an,Shaanxi 710055,China;Shaanxi Key Lab of Geotechnical and Underground Space Engineering(XAUAT),Xi’an,Shaanxi 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]陕西省岩土与地下空间工程重点实验室,陕西西安710055

出　　处：《工程力学》2023年第7期228-238,共11页Engineering Mechanics

基　　金：国家自然科学基金项目(52108473);中国博士后科学基金项目(2021M693876);陕西省自然科学基金重点项目(2022JZ-23)。

摘　　要：地裂缝场地动力效应和上、下盘错动严重影响地下结构的安全。以处于地裂缝环境的西安康复路地铁车站为研究对象,开展了水平和竖向地震共同作用下地裂缝场地地铁车站振动台试验,分析了模型土与车站的加速度反应规律及模型车站应变分布特征。同时,采用有限元软件ABAQUS建立有无地裂缝场地条件下车站的三维数值模型,研究了2类场地条件下地铁车站层间位移角和地震损伤分布规律。结果表明:水平和竖向地震共同作用时,地裂缝场地上、下盘动力差异响应和车站加速度反应较单向水平地震作用时明显增大。相较于无地裂缝场地车站,地裂缝场地车站的层间位移角明显增大,其构件损伤发展更加剧烈。这是由于地裂缝场地土与车站之间易出现脱空区,造成车站振动反应增强;同时,竖向地震引起的地裂缝场地上下盘错动会产生对车站附加的剪切作用,使其中柱更易发生严重损伤而导致结构整体破坏。The dynamic effect and the dislocation of hanging-wall and footwall in ground fissure area seriously affect the safety of underground structures.Xi’an Kangfulu station was investigated,which was located in ground fissure area.A shaking table test on subway station in ground fissure area subjected to coupled horizontal-vertical(bidirectional)earthquake excitations was carried out,in which the acceleration response of the model soil,the acceleration response of model station,and the strain distribution characteristics of model station were analyzed.The three-dimensional models of stations in fissured and non-fissured ground were established using Abaqus,respectively.The inter-story drift ratios and seismic damage distribution-rules of subway station under two kinds of area conditions were studied.The results indicated that the dynamic differential response of the hanging-wall and footwall and dislocation between the hanging-wall and footwall in ground fissure area under the coupled horizontal-vertical earthquake excitations were more significant than those under the horizontal earthquake excitations.Compared with the station in the non-fissured ground,inter-story drift ratios of the station in fissured ground increased obviously,and the damage of structural members was more severe.The reason could be that the void area was easy to develop between the soil with ground cracks and the station,resulting in the enhanced vibration response of the station.Meanwhile,the dislocation between the hanging-wall and footwall would produce an additional shear effect on the station,which was mainly caused by the vertical earthquake.Consequently,the pillar was more prone to severe damage,resulting in the overall failure of the station.

关 键 词：地裂缝 地铁车站 振动台试验 动力反应 地震损伤 

分 类 号：TU435[建筑科学—岩土工程]