暴雨、地震作用下堰沟隧道洞口边坡稳定性分析

Stability analysis of Yangou tunnel entrance slope under the action of heavy rain and earthquake

堰沟隧道麻柳湾端洞口边坡地处岩堆体地段,地质条件复杂,岩堆的存在严重弱化了边坡的稳定性。文章通过数值模拟计算分析了堰沟隧道麻柳湾端洞口边坡在自然状态、暴雨及地震状态下的稳定性,研究了锚杆抗滑桩加固作用下的加固效应。研究结果表明:暴雨、地震对洞口边坡的影响很大,地震的影响尤甚,在没有加固措施的情况下,洞口边坡的稳定性很差;通过增加锚杆抗滑桩加固后,锚杆轴力在暴雨、地震状态下急剧增加,加固效果显著。计算结果对堰沟隧道的设计和施工具有指导作用。

Yangou tunnel entrance slope is located in Maliuwan where the place passes through rock heap area with a complicated geological condition,and the existence of the rock heap seriously weakens the stability of the slope.In this paper,the stability of Yangou tunnel entrance slope under natural state,rainstorm and earthquake condition was analyzed respectively and the reinforcement effect of anchor anti-slide pile was studied by numerical simulation.The research results show that the impact of heavy rain and earthquake on the slope of the tunnel is very large,especially the earthquake.In the absence of reinforcement measures,the stability of the slope is very poor.However,after reinforcing the slope by adding anchor anti-slide piles,the axial force of the anchor increases rapidly under the action of heavy rain or earthquake and the reinforcement effect is obvious.The research results can provide guidance for the design and construction of the Yangou tunnel.