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针对岩石Hoek-Brown(HB)强度准则无法考虑中间主应力对强度的影响的问题,借鉴混凝土Ottsosen强度准则表达式,提出一个简便三维HB准则。详细推导所提出准则的3种不同表达式,并对其强度破坏面图像外凸性和光滑性进行证明。涉及的待定参数采用多元非线性拟合模型确定,采用8种不同的岩石真三轴试验验证模型的合理性。同时比较新强度准则3种不同表达式得到的确定系数,进一步与其他3个三维HB准则进行了比较。结果表明准则不但简便,具有较高的精度,且便于进一步形成弹塑性本构。
According to Hoek-Brown (HB) strength criterion, the influence of intermediate principal stress on strength can not be considered. Based on concrete Ottsosen strength criterion expression, a simple three-dimensional HB criterion is proposed. Three different expressions of the proposed criterion are deduced in detail, and the convexity and smoothness of the image of the strength failure surface are proved. The involved parameters to be determined are determined by the multivariate nonlinear fitting model. Eight different true triaxial tests of rock are used to verify the rationality of the model. At the same time, the deterministic coefficients obtained from the three different expressions of the new intensity criterion are compared and further compared with the other three three-dimensional HB criteria. The results show that the criterion is not only simple, with high precision, and easy to further form elastoplastic constitutive.