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准确的地应力实测资料是确定地下岩体力学性质,进行工程结构设计施工、围岩安全稳定性分析和科学化决策的必要前提和基础。然而,应力解除法求解地应力无法考虑非理想岩性问题,工程应用中采用的忽略或修正的处理方法必将造成较大的误差。根据有限单元法的原理,针对正交各向异性岩体,分别采用理想模型和正交各向异性模型开展了地应力求解研究。结果表明:岩体弹模会造成应力分量误差最大可达56%,第一主应力大小误差为15%~26%,方位角误差为30%~37%,倾角误差为23%~57%。
Accurate data of in-situ stress measurement is the necessary prerequisite and basis for determining the mechanical properties of underground rock mass, designing and constructing engineering structures, analyzing the safety and stability of surrounding rock and making scientific decisions. However, the stress relieving method can not solve the problem of in-situ stress and can not consider the non-ideal lithology. The neglected or modified processing methods used in engineering applications will certainly cause large errors. According to the principle of finite element method, for the orthotropic rock mass, the ideal stress model and orthogonal anisotropy model are respectively used to study the solution of the geo-stress. The results show that the elastic modulus of rock mass can reach up to 56%, the first principal stress size error is 15% ~ 26%, the azimuth error is 30% ~ 37% and the inclination error is 23% ~ 57%.