隧道围岩优势节理面统计及其块体稳定性分析

摘要

As for tunnels in fractured surrounding rock with developed joints,it is very important to rapidly judge the stability of surrounding rock in light of the joint development on the excavation face.Using the right line of the Chayuanli Tunnel as an example,the dominant joint surfaces were identified based on the specific description and statistical analysis of the joint development characteristics at YK21 +670～YK21+718.A block stability analysis was carried out by the stereographic projection analytical method.The type of rock mass sliding and stress state were obtained and compared with that of numerical calculations.Additionally,the rock blocks with the potential to fail and the consolidated area were determined,ensuring the safety of the tunnel construction.%对于节理发育的破碎围岩隧道工程,根据开挖面的节理发育情况对围岩稳定性作出快速判断是至关重要的.文章以宁波象山港大桥接线段的茶园里隧道右线为例,通过对该隧道右线YK21+670～YK21+718段围岩节理发育特征的精细化描述和统计分析,确定了该段围岩的优势节理面,并在此基础上利用赤平投影解析法进行了围岩块体稳定性分析,得出了围岩块体滑移形式及块体的受力状态,并与数值计算结果相互验证,确定了可能发生失稳的块体,明确了加固区域,对有效保证隧道开挖施工安全有重要意义.