考虑上下土柱作用的隧道抗震计算方法研究  

Calculation Method of Tunnel Seismic Resistance Considering the Action of the Height of Upper and Lower Soil Columns

作　　者：高峰[1] 彭孟竹 付明 冯思远 卢妙丹 刘云[2] GAO Feng;PENG Mengzhu;FU Ming;FENG Siyuan;LU Miaodan;LIU Yun(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,P.R.China;Chongqing Industry Polytechnic College,Chongqing 401120,P.R.China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆工业职业技术学院,重庆401120

出　　处：《重庆交通大学学报（自然科学版）》2019年第8期39-44,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(51778095; 51408222);重庆市教委科学技术研究项目(KJ1730413);重庆市基础科学与前沿技术研究专项资助项目(cstc2017jcyjAX0078)

摘　　要：目前隧道抗震采用的惯性力法,仅考虑了隧道上部土柱的地震力作用,未考虑下部土柱的地震力作用,从而造成计算结果与实际情况有偏离,有必要对此进行研究。利用ANSYS有限元软件,采用时程分析法计算出不同隧道埋深、跨径和围岩等级等条件下地下结构的地震响应,并与惯性力法进行对比,分析了两种计算结果的差异。根据应力路径法计算出隧道周边围岩中的压力拱高度,即隧道周围介质的影响范围,从而确定了上下土柱的地震力作用范围,然后将其应用在惯性力法中,提出了考虑上下土柱作用的计算地震力的修正公式,即修正惯性力法。结果表明:修正惯性力法具有较好的精度。研究结果对隧道抗震设计具有参考价值。At present,the inertial force method used in tunnel seismic resistance only considers the seismic force of the upper soil column of the tunnel,and doesn t consider the seismic force of the lower soil column.As a result,the calculation results deviate from the actual situation,which is necessary to study.Using ANSYS finite element software,the seismic response of underground structures under different tunnel depth,span and surrounding rock level was calculated through time-history analysis method.And it was compared with inertial force method;the difference between the results of two methods was analyzed.According to the stress path method,the height of the pressure arch in the surrounding rock of the tunnel,i.e.the influence range of the surrounding medium of the tunnel,was calculated,and the seismic action range of the upper and lower soil columns was determined.Then it was applied to the inertial force method,and a modified formula for calculating seismic force considering the action of upper and lower soil columns,i.e.the modified inertial force method,was proposed.The results show that the modified inertial force method has good accuracy.The conclusions obtained have reference value for seismic design of tunnels.

关 键 词：隧道工程 应力路径法 上下土柱高度 时程分析法 惯性力法 

分 类 号：U458.3[建筑科学—桥梁与隧道工程]