基底空洞条件下重载铁路隧道铺底结构动力响应分析  

Dynamic Response Analysis of Heavy Haul Railway Tunnel Bedding Structure Under the Condition of Base Cavity

作　　者：卢小永 刘聪[2,3] 雷明锋 冯涛[5] 赵晨阳 LU Xiaoyong;LIU Cong;LEI Mingfeng;FENG Tao;ZHAO Chenyang(Science and Technology Research Institute,Daqin Railway Co.Ltd.,Taiyuan 030013,China;School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil and architectural Engineering,East China University of Technology,Nanchang 330013,China;MOE Key Laboratory of Engineering Structures of Heavy Haul Railway(Central South University),Changsha 410075,China;Maintenance Department,China Railway Taiyuan Group Co.Ltd.,Taiyuan 030013,China)

机构地区：[1]大秦铁路股份有限公司科学技术研究所,太原030013 [2]中南大学土木工程学院,长沙410075 [3]东华理工大学土木与建筑工程学院,南昌330013 [4]重载铁路工程结构教育部重点实验室(中南大学),长沙410075 [5]中国铁路太原局集团有限公司工务部,太原030013

出　　处：《铁道建筑》2021年第3期46-50,共5页Railway Engineering

基　　金：大秦铁路股份有限公司重载技术升级专项计划(A2019G04)。

摘　　要：为分析基底空洞条件下重载铁路隧道铺底结构的动力响应特性,确定其潜在易损部位,依托大秦铁路摩天岭隧道工程,采用有限元软件ABAQUS建立列车-隧道-围岩一体化三维数值模型,分析列车荷载单独作用和围岩压力与列车荷载共同作用两种工况下基底空洞对铺底结构的影响。结果表明:基底空洞会明显增加隧道铺底结构的动力响应,列车荷载单独作用下有空洞时铺底结构底面的最大主应力比无空洞时增加约1.25倍,围岩压力与列车荷载共同作用下有空洞时铺底结构顶面的最大主应力比无空洞时增大31%;围岩压力会对列车动力响应造成较大影响,在围岩压力和列车荷载共同作用下无空洞时铺底结构底面测点的最大主应力时程曲线振幅为130 kPa,比列车荷载单独作用时增大21%;靠近隧道中心线侧的轨道正下方和侧沟处为隧道铺底结构的潜在易损部位。In order to analyze the dynamic response characteristics of heavy haul railway tunnel bedding structure under the condition of base cavity and determine its potential vulnerable parts,the integration three-dimensional numerical model of train-tunnel-surrounding rock was established by using the finite element software ABAQUS,and the influence of base cavity on the bedding structure under two working conditions of single train load action and the combined action of surrounding rock pressure and train load was analyzed by relying on the Motianling tunnel project of Datong-Qinhuangdao Railway.The results show that the dynamic response of the tunnel bedding structure is significantly increased by the base cavity,and the maximum principal stress on the bottom surface of the bedding structure with cavity is about 1.25 times the maximum principal stress without cavity under single train load action.Under the combined action of surrounding rock pressure and train load,the maximum principal stress on the top of the bedding structure with cavity is 31%more than that without cavity.The surrounding rock pressure has a great influence on the dynamic response of the train.Under the combined action of surrounding rock pressure and train load,the amplitude of the time history curve of the maximum principal stress at the bottom measuring point of the bedding structure without cavity is 130 kPa,which is 21%more than that under the single action of train load.The positions under the track and side ditch near the center line of the tunnel are the potential vulnerable parts of the tunnel bedding structure.

关 键 词：重载铁路隧道 动力响应 数值模拟 铺底结构 基底空洞 围岩压力 列车荷载 主应力 

分 类 号：U45[建筑科学—桥梁与隧道工程]