岩溶区运营公路隧道衬砌受力特性模型试验分析  

Experimental Study on the Model of Lining Stress Characteristics of Highway Tunnel in Karst Area

作　　者：李晓刚 支华龙 彭帆 徐亦鑫 杨晓晖 LI Xiao-gang;ZHI Hua-long;PENG fan;XU Yi-xin;YANG Xiao-hui(CCFEB Civil Engineering Co. Ltd. , Changsha 410000, China;School of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China)

机构地区：[1]中建五局土木工程有限公司,长沙市410000 [2]湘潭大学土木工程与力学学院,湘潭市411105

出　　处：《公路》2018年第5期296-302,共7页Highway

基　　金：湖南省教育厅青年基金项目,项目编号16B255

摘　　要：岩溶区隧道的修建改变了原有地下水平衡,溶洞的存在会使水压力集中作用在隧道衬砌上产生集中应力,严重威胁到隧道的正常运营与安全。以广东省岩溶地区运营公路隧道为工程依托,基于室内隧道模型试验,研究岩溶区运营公路隧道在不同溶洞空间分布形态大小特征、不同节理倾角、强降雨条件下衬砌的受力特性,以隧道衬砌表面应变、孔压、土压力和衬砌周边围岩位移的试验测试数据为分析依据,得出结论：沿经过隧道衬砌中心位置走向为45°和135°的溶洞对隧道衬砌不良作用大;溶洞的直径对于隧道衬砌受力特性影响最小,其作用主要是通过与围岩节理面倾角和溶隧间距（溶洞与隧道）的组合来体现;溶洞与隧道距离约在该距离为1.5倍隧道直径时,隧道衬砌的安全性最差;围岩的节理面倾角对隧道衬砌安全性的影响较为复杂,主要表现为以围岩沿节理面方向运动发生的附加应力作用和地下水沿节理面渗流所发生的孔压调节作用。The construction of tunnel in karst area changes the existing groundwater balance,and the existence of karst cave could make the water pressure concentrated in the tunnel lining and produce concentration stress,which will result in severe threat to the normal operation and safety of the tunnel.The paper takes a highway tunnel under operation in karst area of Guangdong Province as the study project,based on the indoor tunnel model test,the stress characteristics of the lining of highway tunnel under operation in karst area in different karst cave,different inclination angle of the surrounding rock,different rainfall intensities and loading conditions are studied,and the monitoring data of the tunnel lining surface strain,pore pressure,soil pressure and surrounding rock displacement of lining are analyzed.Following conclusions are drawn：（1）karst with 45° and 135° angle to the center of lining has unfavorable impact on lining of tunnel;（2）the diameter of karst cave has the least influence on the characteristics of tunnel lining,and its function is mainly embodied by combining the inclination of the surrounding rock joints and the distance between karst cave and tunnel;（3）when the distance between karst and tunnel is around 1.5 times of the tunnel diameter,the safety of lining is worst;and（4）the inclination of the surrounding rock joints has a complicated influence on the safety of tunnel lining,mainly manifested as the effect of the additional stress and the pore pressure regulating action of groundwater along the joints of the surrounding rock in the direction of joints.

关 键 词：岩溶区 公路隧道 衬砌 模型试验 分析 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]