不良地质区域内隧道围岩失稳及支护处理方法

Tunnel surrounding rock instability and supporttreatment method in bad geological area

不良地质区域内隧道围岩支护稳定是保障安全施工的要点。本文以冻土区域特长隧道建设为工程背景,结合区域水文地质条件,分析了围岩失稳的成因机制及处理方法。分析表明,此工程的围岩稳定性较差,节理裂隙较为发育,岩体较破碎,施工支护不足是围岩失稳的主要影响因素。为解决围岩失稳问题,我们通过改进了支护方式,控制围岩变形,并通过软件模拟计算验证支护效果,结果分析方案可行。本文提出的支护处理方法可为不良地质区域隧道施工提供一定的借鉴。

The stability of tunnel surrounding rock support in bad geological area is the key point to ensure safe construction.Based on the construction of extra-long tunnel in frozen soil region,the paper analyzes the cause mechanism and treatment method of surrounding rock instability in combination with regional hydrogeological conditions.The analysis shows that the stability of surrounding rock is poor,the joints are more developed,the rock is more broken,and the construction support is insufficient,which is the main influencing factor of the instability of surrounding rock.By improving the support mode,controlling the deformation of surrounding rock,and using software simulation calculation,the support effect is verified.Provide certain reference significance for the tunnel construction in bad geology area.