摘要
以朝东岩隧道为背景,运用二维弹塑性分析研究了隧道侧面45°和正侧面不同大小、不同距离的溶洞分布对隧道围岩稳定性的影响。研究结果表明:隧道侧面溶洞随距离的增大,围岩稳定性增强,距离与隧道开挖引起的释放位移之间存在明显的相关关系,影响的分界线大约在溶洞尺寸的2～3倍;在拱顶附近的周边释放位移比底部的释放位移大。同时隧道侧面的溶洞容易引起隧道开挖过程中的偏压现象,隧道整体向溶洞一侧发生释放位移。
Based on the excavation of Chaodongyan Tunnel, a numerical analysis concerning the influence of Karst caves beside the tunnel on stability of its surrounding rock mass is carried out, using the ANSYS software system, the yield initiation is assumed to occur following Druck-Prager failure criterion. The results of numerical modeling show that the deformation of surrounding rock mass of the tunnel reduces with increase of the distance between the Karst cave and the tunnel. There is a good relationship between the deformation of the surrounding rock mass and the distance from the karst cave to the tunnel. The limited distance between the karst cave and the tunnel is about 2～3 times of the diameter of Karst cave. There is a deviation pressure occurred during excavation because of the karst caves beside the tunnel.
出处
《重庆建筑大学学报》
CSCD
2003年第1期6-11,共6页
Journal of Chongqing Jianzhu University
基金
重庆市重点科技攻关项目(2001-25-03)
湖北省恩施州318国道朝东岩隧道项目部资助项目
关键词
稳定性
隧道围岩
数值分析
岩溶
二维弹塑性
Karst cave
the surrounding rock mass of tunnel
numerical analysis
