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目前的强度折减法的实施主要以Mohr-Coulomb线性准则为主,该模型作为广义Hoek-Brown准则的线性近似,在描述岩体非线性力学行为特别是低应力状态影响和强度围压效应时存在不足。尽管一些学者已提出基于广义Hoek-Brown准则强度折减法的实现方法,但仍然存在力学概念模糊或分析效率较低的问题。以更为契合工程需要为目的,以抗剪强度作为指标将基于Hoek-Brown准则强度折减法的力学定义具体化,即系统性阐述了折减后岩体强度的力学表达,并提出用于折减后强度参数标定的非线性拟合方法,最后通过案例比较分析验证了研究成果的合理性。
The current strength reduction method is mainly based on the Mohr-Coulomb linear criterion. As a linear approximation of the generalized Hoek-Brown criterion, the model exists when describing the nonlinear mechanical behavior of rock mass, especially the influence of low stress state and the confining pressure effect insufficient. Although some scholars have proposed the method of strength reduction based on the generalized Hoek-Brown criterion, there still exist some problems that the concepts of mechanics are fuzzy or the analysis efficiency is low. In order to meet the engineering requirements more objectively, the mechanical definition based on the Hoek-Brown criterion strength reduction method is embodied with the shear strength as the index, that is, the mechanical expression of the reduced rock mass strength is systematically elaborated, Then deduct the non-linear fitting method of calibrating the intensity parameters, and finally verify the rationality of the research results through the comparative analysis of cases.