复杂地质条件下隧道洞口崩塌成因分析及处治措施研究

Cause analysis and treatment measures of tunnel entrance collapse under complex geological conditions

以石门坪1号隧道为工程背景,对隧道洞口崩塌成因及稳定性进行了深入分析,提出了相应的崩塌处治措施,并通过运营情况对崩塌处治效果进行了验证。研究结果表明,石门坪1号隧道洞口崩塌发生的基本条件是复杂的地形条件+特殊的二元岩土结构,诱发因素是不当的施工工序+降雨条件。基于崩塌成因分析并结合坡体稳定性分析,针对性地提出了坡面处治及暗洞加强方案,隧道洞口崩塌处治取得了良好的效果。

Taking Shimenping No.1 tunnel as the engineering background,the cause and stability of tunnel entrance collapse are deeply analyzed,the corresponding collapse treatment measures are put forward,and the effect of collapse treatment is veri-fied by the operation situation.The research results show that the basic conditions for the collapse of Shimenping No.1 tunnel entrance are complex terrain conditions+special dual rock and soil structure,and the induced factors are improper construction procedures+rainfall conditions.Based on the analysis of the cause of collapse and the analysis of slope stability,the slope surface treatment and tunnel strengthening plan are put forward,and the tunnel entrance collapse treatment has achieved good results.