跨走滑断层隧道失稳演化过程及稳定性分析  

Stability Analysis and Instability Evolution Process of Tunnel Crossing Strike-slip Fault

作　　者：王道远[1] 布亚芳[1] 张亚琴 王朝红[1] 田小路 杨杰 袁金秀[1] WANG Daoyuan;BU Yafang;ZHANG Yaqin;WANG Zhaohong;TIAN Xiaolu;YANG Jie;YUAN Jinxiu(Hebei Jiaotong Vocational and Technical College,Shijiazhuang,Hebei 050091,China;China Railway 16th Bureau Group Fourth Engineering Co.Ltd,Beijing 101400,China;Hebei Construction Group Corporation Limited,Baoding,Hebei 572000,China)

机构地区：[1]河北交通职业技术学院,石家庄050091 [2]中铁十六局集团第四工程有限公司,北京101400 [3]河北建设集团股份有限公司,保定572000

出　　处：《铁道工程学报》2023年第9期62-71,共10页Journal of Railway Engineering Society

基　　金：河北省自然科学基金资助项目(E2021419001)。

摘　　要：研究目的:为评判跨走滑断层隧道的稳定性,首先视跨断层隧道为一含剪切带的“围岩-断层-围岩”复合岩体系统,揭示其失稳演化机制;其次基于含断层带复合剪切梁理论,推导跨走滑断层隧道失稳临界损伤长度、临界损伤荷载和极限位移计算表达式;最后对影响隧道稳定性的主要参数进行敏感性分析。研究结论:(1)跨走滑断层隧道失稳演化过程主要经历3个典型阶段,即含剪切带的“围岩-断层-围岩”系统变形协调促使强度降低、断层剪切带两侧围岩受拉而呈现拉裂损伤区、“围岩-复合剪切带-围岩”系统达到新的平衡状态;(2)当断层宽度、动摩擦系数、峰值剪应力、剪切梁剪切模量越小,隧道埋深、剪切梁宽度、塑性软化剪切模量越大,跨走滑断层隧道稳定性越差;(3)跨走滑断层隧道稳定性影响因素的敏感性为:断层宽度t>剪切梁剪切模量G>隧道埋深H>滑动摩擦系数μf>断层塑性软化剪切模量Gfs>断层峰值剪应力τfc;(4)本研究结论可为跨走滑断层隧道设计提供一定的理论依据。Research purposes:In order to evaluate the stability of tunnel crossing strike-slip fault,the tunnel crossing fault was regarded as a"surrounding rock-fault-surrounding rock"composite rock mass system with shear zone,and its instability evolution mechanism was revealed.Based on the theory of composite shear beam with fault zone,the calculation expressions of critical damage length,critical damage load and ultimate displacement were derived.Finally,the sensitivity analysis of main parameters affecting the stability of tunnel was carried out.Research conclusions:(1)The instability evolution process of tunnel crossing strike-slip fault has experienced three typical stages,including:the deformation coordination of the"surrounding rock-fault-surrounding rock"system with shear zone causes the strength to decrease,the surrounding rock on both sides of the fault shear zone is stretched and presents a strain crack damage zone,and the"surrounding rock-composite shear zone-surrounding rock"system reaches a new equilibrium state.(2)When the fault width,dynamic friction coefficient,peak shear stress and shear modulus of shear beam are smaller,the tunnel buried depth,shear beam width and plastic softening shear modulus are larger,and the tunnel construction process crossing strike slip fault is more prone to instability.(3)The sensitivity of factors affecting the stability of tunnel construction crossing strike slip fault is as follows:fault width t>shear modulus of shear beam G>buried depth of tunnel H>sliding friction coefficientμf>plastic softening shear modulus of fault Gfs>peak shear stress of faultτfc.(4)The research conclusion can provide a certain theoretical basis for the design of tunnels crossing strike slip faults.

关 键 词：隧道工程 走滑断层 失稳机制 剪切梁理论 敏感性分析 

分 类 号：U45[建筑科学—桥梁与隧道工程]