陕西何家梁隧道地应力测量及围岩稳定性评价

基于何家梁软岩隧道的工程地质条件与三维水压致裂地应力测试方法,测量并分析了工程区地应力分布规律,并采用FLAC3D数值分析软件对隧道开挖稳定性进行了评价。结果表明:自重应力是该地应力场中的主要影响因素,测区应力场为高应力水平,隧道开挖后,边墙中上部及拱顶有不同程度的下沉,周边位移相对值仍在规范允许范围之内。测试及数值分析结果可为工程区隧道开挖的稳定性分析及安全支护提供参考,可对类似软岩隧道的地应力测试及分析提供借鉴。

In-situ stress measurement and stability assessment of surrounding rock mass in Hejiangliang tunnel of Shaanxi Province

Based on the engineering geological conditions of Hejialiang tunnel in soft rock mass and the 3D hydro-fracturing test,the distribution law of in-situ stress in the engineering area was measured and analyzed,and the stability assessment on the surrounding rock mass after excavation was also carried out by FLAC3D.The results show that: gravity stress is the main influential factor of the in-situ stress field;the stress field of the test area is at high stress level;after tunnel excavated,the central and upper part of the side wall and the vault have different degrees of settlement,and the relative displacement of the surrounding area is still within the scope of the specification.The results of test and numerical analysis provide reference for stability analysis and safety support of tunnel excavation in the engineering area,as well as the in-situ stress measurement and analysis of similar soft rock tunnel.