富水岩溶隧道围岩软化效应分析及整治措施研究  

Study on Softening Effect of Surrounding Rock of Water-rich Karst Tunnel and Regulation Measures

作　　者：田娇[1] 杨洪[1] 苟德明[1] 欧阳淋旭 欧雪峰 张学民[3] 曾晓辉[3] TIAN Jiao;YANG Hong;GOU Deming;OUYANG Linxu;OU Xuefeng;ZHANG Xuemin;ZENG Xiaohui(Guizhou Transportation Planning Survey and Design Academe Co.,Ltd.,Guiyang 550001,China;School of Civil Engineering Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550001 [2]长沙理工大学土木工程学院,长沙410114 [3]中南大学土木工程学院,长沙410075

出　　处：《交通科技》2022年第6期83-87,共5页Transportation Science & Technology

基　　金：国家自然科学基金(51978671);贵州省交通运输厅科技项目(2017-212-029);高压富水特长岩溶隧道渗流场分析及施工控制措施研究项目(CXCLY2022041)资助。

摘　　要：当隧道穿越富水岩溶地层时,易诱发地表塌陷、拱顶掉块等地质灾害,文中采用室内试验方法研究富水岩溶隧道“水-岩”软化效应,探讨干燥、天然、饱和3种含水状态下围岩的强度衰减规律。结果表明,地下水软化效应是导致隧道围岩强度降低,进而诱发大变形地质灾害的主要因素。随着岩石含水量逐渐增加,围岩遇水软化后强度衰减率呈折线形分布。经现场实践证明,采用“超前预注浆+径向防渗注浆”的全帷幕注浆处治技术,可有效封堵岩溶水,达到整治富水岩溶隧道大变形灾害的目的。When the tunnel crosses the water-rich karst stratum,it is easy to induce geological disasters such as surface collapse and vault falling blocks.The softening effect of“water-rock”in water-rich karst tunnels was investigated by using an indoor test method,and the strength decay law of surrounding rocks in three water-bearing states of dry,natural and saturated.The results show that the groundwater softening effect is the main factor leading to the reduction of tunnel envelope strength,which in turn induces large deformation geohazards.As the water content of the rock gradually increases,the strength decay rate of the surrounding rock after water softening is distributed in a polyline pattern.The field practice proves that the full curtain grouting treatment technology of“over-advance pre-grouting+radial impermeable grouting”can effectively seal the karst water and achieve the purpose of rectifying the large deformation disaster of water-rich karst tunnel,which can provide useful reference for the tunnel construction of similar strata.

关 键 词：隧道工程 富水岩溶 软化效应 大变形 控制措施 

分 类 号：U456[建筑科学—桥梁与隧道工程]