十白高速公路泰山沟隧道进口边坡稳定性及其破坏概率分析

Stability and Failure Probability Analysis of the Entrance Slope in Taishangou Tunnel

十堰至白河高速公路泰山沟隧道进口边坡的稳定性对公路建设和运营的安全尤为重要。本文在分析泰山沟隧道进口边坡的工程地质特征及其破坏模式的基础上,采用概率分析方法对泰山沟隧道进口边坡的稳定性及其破坏概率进行了计算与分析。结果表明:边坡稳定性计算显示泰山沟隧道进口边坡在正常工况下处于稳定状态,具有一定的安全储备,但在非正常工况Ⅰ条件下处于基本稳定性状态,在极不利工况条件下处于极限平衡状态;边坡破坏概率计算显示秦山沟隧道进口边坡在正常工况条件下存在低危险性,在非正常工况Ⅰ条件下存在中等危险性,在极不利工况条件下存在高危险性;两种分析结果一致,同时说明泰山沟进口边坡在非正常工况Ⅰ条件下的安全储备不高,需要对其进行加固处理,以为公路安全运营提供保障。

The stability of the entrance slope in Taishangou Tunnel,which is in the road between Shiyan and Baihe,is an inevitable issue and it is important to carry out the stability evaluation of the slope. Based on the engineering geology characteristics and failure mode of the slope, this paper calculates the stability and failure probability of the slope by comprehensive analysis methods. The results show that the slope is stable under normal operating conditions,it is in a basically stable state under abnormal operating condition I ,and it is in a critical state under extremely adverse operating conditions. Meanwhile the calculation re- sults show that the slope is in a low-risk state under normal operating conditions,it is in a medium-risk state under abnormal operating condition I ,and it is in a high-risk state under extremely adverse operating conditions. The two analytical results are consistent and they indicate that it is important to reinforce the slope under abnormal operating condition I so as to provide guarantee for highway safety operation.