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作为一种非线性经验强度模型,Hoek-Brown(H-B)破坏准则有一定的适用条件。基于H-B破坏准则的基本公式,建议将围压范围0<σ3<0.5σc(σ3为岩石破坏时的最小主应力;σc为单轴抗压强度)作为其适用条件,在该条件下H-B破坏准则能较好地拟合岩石三轴压缩试验数据。进而采用一种新的完整岩石破坏准则与H-B破坏准则对几组岩石三轴压缩试验数据进行拟合,对比发现,在适用条件内,H-B破坏准则可较好地拟合岩石三轴压缩试验数据,然而将拟合延伸到高围压阶段会高估岩石强度,需引起注意;新模型可在较大围压范围内较好地拟合岩石三轴压缩试验数据,有更强的非线性能力和适用性。
As a nonlinear empirical strength model, the Hoek-Brown (H-B) failure criterion has certain conditions. Based on the basic formula of HB failure criterion, we propose that the confining pressure range of 0 <σ3 <0.5σc (σ3 is the minimum principal stress of rock failure; σc is the uniaxial compressive strength) Can well fit the rock triaxial compression test data. Then a new complete rock failure criterion and HB failure criterion are used to fit the triaxial compression test data of several groups of rocks. It is found that under the applicable conditions, the HB failure criterion can well fit the triaxial compression test data However, extending the fitting to the high confining pressure stage will overestimate the rock strength, which needs attention. The new model can better fit the triaxial compression test data in a larger confining pressure range and has stronger nonlinear capability And applicability.