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运用区间理论确定基于地质强度指标GSI的岩体抗剪强度的方法是近年来岩土界研究的新成果,因其合理性与可操作性被广泛应用。该文在此基础上,根据岩块体积Vb、节理表面系数Jc和地质强度指标GSI的定量关系,建立了按区间理论和贝叶斯网联合确定GSI区间概率的方法。根据Hoek-Brown与Mohr-Coulomb准则间的等效关系,采用区间理论确定基于GSI的岩体抗剪强度参数区间,进一步采用贝叶斯网对岩体抗剪强度参数区间分布进行概率分析。研究表明,该方法不仅可以确定出区间的上下限,而且可以得到各小区间的概率分布,为岩体抗剪强度的不确定性分析提供了一条新途径。
The method of applying interval theory to determine the shear strength of rock mass based on GSI is a new achievement in rock and soil research in recent years. It is widely used due to its rationality and operability. Based on the quantitative relationship between rock mass volume Vb, joint surface coefficient Jc and geological intensity index GSI, a method to determine the GSI interval probability by the combination of interval theory and Bayesian network is established. According to the equivalent relationship between Hoek-Brown and Mohr-Coulomb criterion, the interval theory is used to determine the shear strength parameters interval of rock mass based on GSI, and the Bayesian network is used to further analyze the probability distribution of shear strength parameters of rock mass. The research shows that this method can not only determine the upper and lower bounds of the interval, but also obtain the probability distribution among all the cells, which provides a new way for the analysis of the uncertainty of rock shear strength.