盾构隧道施工扰动对隧道与车站地震响应的影响分析  

Impact of shield tunnel construction on the seismic responses of tunnels and stations

作　　者：加瑞[1,2] 杨岗 郑刚 李青茁[1,2] 许敬明 JIA Rui;YANG Gang;ZHENG Gang;LI Qingzhuo;XU Jingming(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300350

出　　处：《地震工程学报》2025年第1期69-81,共13页China Earthquake Engineering Journal

基　　金：天津市科技计划项目(21JCYBJC00380);国家自然科学基金项目(52378362)。

摘　　要：盾构隧道施工扰动会改变隧道周围土体的应力状态和力学性质,从而影响隧道与车站后期的地震响应。通过数值模拟,分析不同程度的应力状态改变和剪切模量衰减对地震时隧道周围土体、管片结构以及车站结构地震响应的影响。结果表明:(1)应力状态改变程度越大(地层应力释放率越大),隧道周围土体的初始剪应力越大,隧道底部土体的剪应变越大,超静孔隙水压力越大;同时,地震引起的管片弯矩和轴力越大(应力释放率30%时地震引起的左拱肩峰值管片弯矩和轴力增量分别是应力释放率10%时的165%和527%),车站侧墙和柱的相对水平位移越大。(2)剪切模量衰减程度越大,隧道周围土体的剪切模量越小,隧道周围土体越软,隧道底部土体的剪应变越大,超静孔隙水压力越大;同时,地震引起的管片弯矩和轴力越小(模量衰减大时地震引起的左拱肩峰值管片弯矩和轴力增量分别是模量无衰减时的67%和40%),车站侧墙和柱的相对水平位移越小。因此,盾构隧道的施工扰动程度对后期隧道与车站的地震响应有明显影响,在隧道与车站的抗震设计时应考虑盾构隧道前期施工对周围土体应力状态及力学性质改变的影响。Disturbances caused by shield tunnel construction alter the stress state and mechanical properties of the surrounding soil,thereby affecting the seismic responses of the tunnel and station.Numerical simulations were conducted to analyze the effects of different degrees of stress state changes and shear modulus degradation on the seismic responses of the soil around the tunnel,as well as the segment and station structures,during an earthquake.Results indicate that:(1)As the degree of stress state change(stress release rate)increases,the initial shear stress of the soil around the tunnel,shear strain at the tunnel bottom,and excess pore-water pressure also increase.In addition,the bending moment and axial force in the tunnel segment,as well as the relative horizontal displacement between the side wall and column of the station,increase.For example,the peak bending moment and peak axial force at the left arch shoulder of the segment caused by the earthquake with a 30%stress release rate are 165%and 527%higher than those with a 10%stress release rate,respectively.(2)As shear modulus degradation increases,the shear modulus of the soil around the tunnel decreases,leading to higher shear strain and excess pore-water pressure at the tunnel bottom.At the same time,the bending moment and axial force in the segment caused by the earthquake and the relative horizontal displacement between the side wall and the column of the station decreases.The larger the shear modulus degradation was,the smaller the bending moment and axial force of the segment caused by the earthquake,the smaller the relative horizontal displacements between the side wall and the column of the station.For example,the peak bending moment and axial force at the left arch shoulder of the segment caused by the earthquake with considerable modulus degradation were only 67%and 40%,respectively,of those without any modulus degradation.Therefore,the disturbance degree from shield tunnel construction evidently influences the subsequent seismic responses of the tun

关 键 词：盾构隧道 施工扰动 应力状态 模量衰减 地震响应 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]