非一致性地震作用下穿越破碎带长大隧道衬砌结构动力变形分析  

Analysis of Lining Structure Dynamic Deformation of Long Tunnel Passing through Fracture Zone under Non-Uniform Seismic Action

作　　者：付晓东[1,2] 丁海锋 袁维 王宏超[4] 周永强 盛谦[1,2] FU Xiaodong;DING Haifeng;YUAN Wei;WANG Hongchao;ZHOU Yongqiang;SHENG Qian(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Roads and Railway Engineering Safety Control,Shijiazhuang Tiedao University,Ministry of Education,Shijiazhuang Hebei 050043,China;No.1 Civil Architecture Design and Research Institute,China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,湖北武汉430071 [2]中国科学院大学工程科学学院,北京100049 [3]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点试验室,河北石家庄050043 [4]中铁二院工程集团有限公司土木建筑设计研究一院,四川成都610031

出　　处：《中国铁道科学》2023年第5期116-126,共11页China Railway Science

基　　金：国家自然科学基金资助项目(52179117);道路与铁道工程安全保障省部共建教育部重点实验室(石家庄铁道大学)开放课题(STDTKF202103);中国科学院青年创新促进会资助项目(2021325)。

摘　　要：为探讨非一致性地震作用下穿越破碎带长大隧道衬砌结构的变形机制,基于随机地震动理论,生成能体现长大隧道行波效应和衰减效应等局部地场效应的地震加速度时程曲线;通过建立不同的不利地质结构形式的多方案隧道有限元计算模型,采用仰拱分区域垂直入射地震波的方式,分析不同倾角、厚度以及岩体等级的破碎带对隧道衬砌轴向和横向变形的影响,揭示非一致性地震作用下长大隧道衬砌结构变形特征。结果表明:非一致性地震作用下长大隧道衬砌结构变形具有明显的空间非一致性;沿隧道轴向方向,破碎带的存在限制了衬砌轴向拉压变形,但加剧了衬砌的轴向剪切变形,当破碎带与隧道夹角为45°时衬砌的轴向拉压和剪切变形最大,而衬砌整体轴向变形受破碎带厚度和岩体等级的影响较小;沿隧道横断面方向,衬砌纵向剪切变形主要集中于拱腰位置,而径向剪切变形集中于拱顶和仰拱位置,衬砌的最大纵向和径向剪切变形均出现在破碎带倾角为45°时,且当破碎带厚度过大时,衬砌横断面的剪切变形也较大,但不同岩体等级对衬砌横断面的剪切变形影响不大。In order to investigate the deformation mechanism of lining structures in long tunnels passing through fracture zones under non-uniform seismic action,time-history curves of seismic acceleration were generated based on the theory of random seismic motion,which can reflect local site effects such as wave propagation and attenuation effects in the vicinity of the long tunnel.Multi-scheme finite element models of tunnels with different adverse geological structures were established,considering the vertical incidence of seismic waves in the arch section.The influence of fracture zones with different dip angles,thicknesses,and rock mass grades on the axial and transverse deformations of the tunnel lining was analyzed to reveal the deformation characteristics of the lining structure in the presence of non-uniform seismic action.The results indicate that the deformation of the lining structure in the long tunnel under non-uniform seismic action exhibits significant spatial non-uniformity.Along the tunnel axis,the presence of the fracture zone restricts the axial tensile and compressive deformations of the lining,but enhances the axial shear deformation.The maximum axial tensile and shear deformations of the lining occur when the fracture zone and the tunnel form a 45°angle;while the overall axial deformation of the lining is less affected by the thickness of the fracture zone and the rock mass grade.In the direction of the tunnel′s transverse section,the longitudinal shear deformation of the lining mainly concentrates at the crown position,while the radial shear deformation concentrates at the arch crown and the inverted arch.The longitudinal shear deformation and radial shear deformations of the lining occur when the fracture zone has a dip angle of 45°.Moreover,when the thickness of the fracture zone is excessive,the transverse shear deformation of the lining in the cross-sectional plane also becomes significant.However,the different rock mass grades have a minor influence on the transverse shear deformation of th

关 键 词：隧道工程 衬砌变形 数值分析 不良地质 地震作用 非一致性 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]