高地应力软岩隧道台阶法双层初期支护效果评价

Evaluation of Double-Layer Initial Support Effect of Bench Method in High Stress Soft Rock Tunnel

摘要: 目前，中西部地区存在的高地应力地质条件严重影响了隧道的正常施工，并且由于山岭地区存在围岩强度较低的特点，在实际的隧道施工中常出现软岩大变形现象。本文以某高地应力软岩隧道为工程背景，采用数值模拟的方法，研究了双层初期支护不同厚度组合条件下围岩竖向沉降和水平变化的规律，对比分析得出适用于该高地应力软岩隧道的施工参数，该研究结论可为今后类似工程施工提供参考。

Abstract: At present, the high ground stress geological conditions in the central and western regions seriously affect the normal construction of the tunnel, and due to the low strength of surrounding rock in mountain areas, large deformation of soft rock often occurs in the actual tunnel construction. Taking a high stress soft rock tunnel as the engineering background, this paper studies the law of vertical settlement and horizontal change of surrounding rock under the condition of different thickness combination of double-layer initial support by using the method of numerical simulation, and obtains the construction parameters suitable for the high stress soft rock tunnel by comparative analysis. The research conclusion can provide reference for similar engineering construction in the future.