Stresses and Shear Fracture Zone of Jinshazhou Tunnel Surrounding Rock in Rich Water Region  

作　　者：郑俊杰 楼晓明 

机构地区：[1]Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology

出　　处：《Journal of Southwest Jiaotong University(English Edition)》2008年第3期233-241,共9页西南交通大学学报（英文版）

基　　金：The Program for New Century Excellent Talents in University ( No. NCET-06-0649);the Natural Science Foundation of Hubei Province (No.2005ABA303)

摘　　要：Field evidence has shown that large-scale and unstable discontinuous planes in the rock mass surrounding tunnels in rich water region are probably generated after excavation. The tunnel surrounding rock was divided into three zones, including elastic zone, plastic damage zone and shear fracture zone for assessing the stability of the tunnel surrounding rock. By local hydrogeology, the stresses of surrounding rock of Jinshazhou circular tunnel was analyzed and the stress solutions on the elastic and plastic damage zones were obtained by applying the theories of fluid-solid coupling and elasto-plastic damage mechanics. The shear fracture zone generated by joints was studied and its range was determined by using Molar-Coulomb strength criterion. Finally, the correctness of the theoretical results was validated by comparing the scopes of shear fracture zones calculated in this paper with those from literature.Field evidence has shown that large-scale and unstable discontinuous planes in the rock mass surrounding tunnels in rich water region are probably generated after excavation. The tunnel surrounding rock was divided into three zones, including elastic zone, plastic damage zone and shear fracture zone for assessing the stability of the tunnel surrounding rock. By local hydrogeology, the stresses of surrounding rock of Jinshazhou circular tunnel was analyzed and the stress solutions on the elastic and plastic damage zones were obtained by applying the theories of fluid-solid coupling and elasto-plastic damage mechanics. The shear fracture zone generated by joints was studied and its range was determined by using Molar-Coulomb strength criterion. Finally, the correctness of the theoretical results was validated by comparing the scopes of shear fracture zones calculated in this paper with those from literature.

关 键 词：JOINTS Pore water pressure Shear fracture zone STRESS Plastic damage zone 

分 类 号：U452.12[建筑科学—桥梁与隧道工程]