Sensitivity analyses of random cave groups on karst tunnel stability based on water–rock interaction using a novel contact dynamic method  

作　　者：Chengzhi Xia Zhenming Shi Huanjia Kou Shaoqiang Meng Maomao Liu 

机构地区：[1]College of Civil Engineering,Tongji University,Shanghai 200092,China [2]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China

出　　处：《Underground Space》2024年第5期162-186,共25页地下空间（英文）

基　　金：financial support provided by the National Key Research and Development Program of China(Grant Nos.2019YFC1509702 and 2023YFC3008300);the National Natural Science Foundation of China(Grant No.42172296).

摘　　要：This paper concentrates on the sensitivity and dynamic simulation of randomly distributed karst cave groups on tunnel stability and connectivity extended ratio based on water–rock interaction using a novel contact dynamic method(CDM).The concept of karst cave group connectivity extended ratio during tunneling and water inrush is proposed.The effects of cave shape and spatial distribution on Qiyueshan tunnel are investigated.Tunnel deformation and damage index,and connectivity extended ratio with uniform random karst cave groups are evaluated.The results demonstrate that the connectivity extended ratio is verified as a crucial judgment in predicting the safe distance and assessing the stability of the tunnel with the karst cave group.CDM model captures the fracture propagation and contact behavior of rock mass,surface flow,as well as the bidirectional water–rock interaction during the water inrush of Qiyueshan tunnel with multiple caves.A larger cave radius and smaller minimum distance between the cave and tunnel increase the deformation and damage index of the surrounding rock.When the cave radius and cave area ratio increase,the failure pattern shifts from overall to local failure.These findings potentially have broad applications in various surface and subsurface scenarios involving water–rock interactions.

关 键 词：Karst tunnel stability Contact dynamic method Connectivity extended ratio Karst cave groups Qiyueshan tunnel Water-rock interaction 

分 类 号：P64[天文地球—地质矿产勘探]