三轴压缩下岩石强度与破坏面角度的双剪理论分析

应用双剪理论对岩石在三轴压缩载荷下的强度和破坏特性进行了理论分析，并将分析结果与已有实验作了对比。研究表明，在岩石的强度特性方面，双剪理论所得分析结果与实验结果较吻合。而在岩石的破坏面角度方面，分析与实验尚需作进一步研究。这可能是由于岩石的破坏特性较之强度特性对其微观结构构造和实验面的条件更敏感所致。然而，作为一种宏观强度理论，双剪理论除了能很好地表述岩石的复杂强度特性外，还具有数学表达简明、便于工程应用等特点，是分析岩石在复杂应力条件下力学特性的有效工具。

CHARACTERISTICS OF ROCK STRENGTH AND FAILURE UNDER TRIAXIAL COMPRESSION ANALYZED BY TWIN SHEAR THEORY

The characteristics of the rock strength and failure under triaxial compressions are theoretically analyzed in detail with the twin shear theory and the results are compared with experimental data. The research work shows that on the aspect of rock strength, the analytical results match the experimental data very well, but on the aspect of fracture orientations, there are some differences between analytical results and experimental data. The main reason may be that the fracture orientations are more sensitive to the inner micro-structures of rock and the condition of testing surface than the strength. However, as one kind of macro-strength theories, the twin shear theory is still an effective tool in analyzing the rock failure and strength under multi-axial stress condition, and it also has many other profits such as simplicity in formulae and convenience for use in practice.