基于FLAC3D的岩体初始高水平构造应力场反演方法

为探讨深部岩体工程初始高水平构造应力场的数值模拟反演方法,采用三维有限差分法FLAC~(3D)分别对位移边界条件、应力边界条件、混合边界条件及基于初始应变能理论的反演方法进行数值试验对比分析。结果表明:在模拟岩体初始高水平构造应力场过程中,位移边界条件、应力边界条件、混合边界条件三种方法均不能满足要求;而基于初始应变能理论的反演方法效果较好,将该方法应用于狮子山矿区地应力场的反演分析,计算表明各测点的地应力反演值与实测值之间误差在允许范围内,进一步验证了该方法模拟计算岩体初始高水平构造应力场具有较好的可靠性,研究成果为深部岩体工程高水平构造应力场的反演计算方法提供了参考。

Inversion Method of Initial High Level Tectonic Stress Field of Rock Mass Based on FLAC3D

In order to study the inversion method of numerical simulation of initial high-level tectonic stress field in rock mass, the displacement boundary condition, stress boundary condition, mixed boundary condition and inversion method based on initial strain energy theory are compared and analyzed by FLAC3D. The results show that the displacement boundary conditions, stress boundary conditions and mixed boundary conditions can not meet the requirements in the process of simulating the initial high-level tectonic stress field of rock mass, while the inversion method based on the initial strain energy theory has a better effect. The method is applied to the inversion of geostress field in Shizishan mining area. The calculation shows that the error between the inversion values of geostress and the measured values is within the allowable range, which verifies that the method has certain reliability in simulating and calculating the initial high-level tectonic stress field of rock mass. The research results provide a certain reference for the inversion of the initial high-level tectonic stress field of rock mass.