穿越多断层公路隧道初始地应力场反演分析

Inverse Analysis of the Initial Ground Stress Field of a Highway Tunnel through Multiple Faults

本文以大丰华高速公路鸿图嶂隧道为依托,建立ANSYS三维数值计算模型,通过现场水压致裂法测得的数据,进行多断层下隧道周边区域初始地应力场反演计算分析;研究结果表明:隧道工程区地应力场的分布基本以构造应力为主,最大水平主应力和垂直应力有随隧道埋深的增大而增大的趋势,且在断层处出现应力释放现象。研究结果为后续设计和施工阶段提供基础数据。

Based on HongTuZhang Tunnel of DaFengHua Expressway, this paper establishes the ANSYS 3D numerical calculation model and performs the inversion analysis of the initial ground stress field in the tunnel surrounding area under multiple faults through the data measured by hydro-fracturing ground stress measurement;the research results show that: the distribution of the ground stress field in the tunnel engineering area is basically dominated by tectonic stress, and the maximum horizontal principal stress and vertical stress have a tendency to increase with the increase of tunnel burial depth. The maximum horizontal principal stress and vertical stress have a tendency to increase with the increase of tunnel depth, and the stress release phenomenon appears at the fault. The results of the study provide basic data for the subsequent design and construction stages.