衬砌背后富水溶洞对铁路隧道结构影响研究——以渝怀铁路涪秀二线新圆梁山隧道为例  

Research on the Influence of Water-rich Cave behind the Lining on Railway Tunnel Structure a Case Study on Xinyuanliangshan Tunnel on the Second Line of Fuxiu in Chongqing-Huaihua Railway

作　　者：姜波 王成林 黄明利[2] 管强 JIANG Bo;WANG Chenglin;HUANG Mingli;GUAN Qiang(Chongqing Survey,Design and Research Institute Co.,Ltd.of CREEC,Chongqing 400023,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;The 5th Engineering Co.,Ltd.of China Railway 11th Bureau Group,Chongqing 400037,China)

机构地区：[1]中铁二院重庆勘察设计研究院有限责任公司,重庆400023 [2]北京交通大学土木建筑工程学院,北京100044 [3]中铁十一局集团第五工程有限公司,重庆400037

出　　处：《铁道标准设计》2021年第8期117-123,共7页Railway Standard Design

基　　金：重庆市科研项目-技术创新与应用示范(社会民生类重点研发)(cstc2018jscx-mszdX0029)。

摘　　要：为研究衬砌背后存在富水溶洞时产生的非均匀荷载对运营期间衬砌结构受力和安全性的影响,以渝怀铁路涪秀二线新圆梁山隧道毛坝向斜高压富水段为例,对衬砌背后存在富水溶洞时衬砌结构内力和安全性进行研究。通过数值模拟,探讨衬砌背后富水溶洞不同位置、不同分布范围及不同水压力下的衬砌内力,并对各种工况下结构安全系数进行分析。研究结果表明:衬砌整体轴力和弯矩与水压力大致呈线性正相关;轴力随空洞范围的增大而增大,但弯矩随着空洞范围的增大,会逐渐增加并最终趋于平稳;富水溶洞附近衬砌安全系数下降幅度最大。分析可知,衬砌结构安全性与结构形式和溶洞位置息息相关,部分衬砌单元破坏,其他单元仍有较大安全储备;衬砌结构设计应与注浆设计相结合,提高衬砌整体安全性。In order to study the impact of the non-uniform load generated by the water-rich caves behind the lining on the force and safety of the lining structure during operation,this paper studies the internal force and safety of the lining in case of water-rich karst caves behind the lining,with reference to the high-pressure and water-rich section of the Maoba Syncline of the Xinyuanliangshan Tunnel on Chongqing Fuling-Xiushan Second Line.Through numerical simulation,the internal forces of the linings at different positions,in different distribution ranges,and under different water pressures of water-rich caves behind the lining are discussed,and the safety factors under various working conditions are analyzed.The research results show that the axial force and bending moment of the lining as a whole are roughly,linearly and positively correlated with the water pressure;the axial force increases with the increase of the cavity range,but the bending moment gradually increases with the increase of the cavity range and eventually tend to stable;the safety factor of the lining near the water-rich cave decreases the most.The analysis indicates that the safety of lining is closely related to the type of lining structure and the location of karst caves;some lining units are damaged,while others remain quite safe;and the structural design and the grouting design should be combined to improve the overall safety of lining.

关 键 词：铁路隧道 溶洞 水压力 衬砌内力 安全系数 

分 类 号：U45[建筑科学—桥梁与隧道工程] U452.11[交通运输工程—道路与铁道工程]