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针对大坪山隧道埋深大、断层带穿越、围岩局部较破碎、整体稳定性差等特点,采用三维有限元法反演隧址区初始地应力场并建立三维地质模型,模拟在自重、水平方向挤压和剪切等4种工况下的构造应力场;用最小二乘法求解回归系数及实测点的计算值,与实测值应力分量对比,给出隧道洞轴线主应力等值线图,探讨隧址区初始地应力场的分布规律及影响因素,结果表明:地应力测试方法、回归公式的相关性和模型的精度、地形和地质构造、边界条件的施加方式及测点岩体质量等均会影响地应力场的反演结果。
According to the characteristics of large buried depth of Daping Mountain tunnel, fault zone crossing, partial fragmentation of surrounding rock and poor overall stability, the three-dimensional finite element method is used to inverse the initial geostress field of the tunnel site and establish a three-dimensional geological model to simulate the tunnel in the deadweight, horizontal direction Squeezing and shearing. The least squares method is used to solve the regression coefficient and the calculated value of measured point, and compared with the measured stress component to get the contour map of principal stress of tunnel tunnel. The results show that the correlations between the test methods of ground stress, the regression formula and the accuracy of the model, the topography and geological structure, the way of application of boundary conditions and the mass of measured rock mass Will affect the in-situ stress field inversion results.