隧道充填岩溶管道滑移失稳突水机制  

Water inrush mechanism for slip instability of filled karst conduit in tunnels

作　　者：黄震[1,2,3] 李仕杰 赵奎 吴锐[1] 钟文[1] HUANG Zhen;LI Shijie;ZHAO Kui;WU Rui;ZHONG Wen(School of Resources and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Sate Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]南京大学地球科学与工程学院,江苏南京210023 [3]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《中南大学学报（自然科学版）》2019年第5期1119-1126,共8页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展规划(973计划)项目(2013CB036001);国家自然科学基金资助项目(41702326,41602294);博士后创新人才支持计划项目(BX201700113);国家博士后科学基金资助项目(2017M620205);江西省自然科学基金资助项目(20171BAB206022);中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1703);江西省教育厅科学技术研究资助项目(GJJ160675)~~

摘　　要：为探究隧道充填岩溶管道滑移失稳突水机制,将岩溶管道视为“塞子”,建立岩溶管道滑移失稳突水的地质模型和力学传递模型,推导出充填岩溶管道失稳判据及安全系数计算公式,并通过算例分析岩溶管道倾角和含水体水位对岩溶管道安全性的影响。研究结果表明:弱透水或不透水的充填岩溶管道在突水过程中的作用类似“塞子”,具有较强阻水性能,此时突水模式为岩溶管道的充填物滑移失稳突水;隧道开挖过程中,作用在岩溶管道的下滑力和抗滑力达到临界条件时,管道发生滑移失稳,最终导致突水的发生;充填岩溶管道的安全系数随着含水体水位增大而不断降低,管道倾角对安全系数的影响比水位的影响小;地下水对岩溶管道安全性的影响很大,其中渗透压力、静水压力和扬压力对管道安全性的影响较大,是触发管道发生滑移失稳、引发突水的关键因素。In order to investigate the water inrush mechanism for slip instability of filled karst conduit in tunnels,a fundamental geological model and the mechanical transitive model of the conduit slip were established by assuming the karst conduit as a plug.The instability criteria for the karst conduit and an equation to calculate the safety factor of the karst conduit were deduced.Influences of the conduit inclination and the water level of the aquifer on the safety of karst conduit were investigated.The results show that the karst conduit of low permeability or impermeable plays a role as a plug that has strong water blocking effects,and it leads to water inrush induced by the conduit slip.Conduit slip and then water inrush occur when the sliding force exceeds anti-sliding force.The safety factor of the karst conduit decreases with the increase of water level of the aquifer.The influence of conduit inclination on safety factor is less significant than that of the water level.The safety of karst conduit is strongly related to groundwater.Seepage pressure,hydrostatic pressure and uplift pressure are the key factors to cause conduit slip and water inrush.

关 键 词：隧道工程 突水机制 力学模型 岩溶管道 滑移失稳 

分 类 号：U451[建筑科学—桥梁与隧道工程]