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在提出了等效破裂角概念的基础上,采用正交分析理论,对煤样剪切破坏规律及其主要影响因素进行了分析.结果表明:煤样共有4种破裂形式,随着内摩擦角及围压的减小,易发生破坏的顺序依次为单剪破坏、共轭破裂、张剪破坏、延性破坏;煤样破坏角随着内摩擦角和围压的增大而减小,随着剪胀角的增大而增大;内摩擦角为45°时,均为单剪破坏,内摩擦角为15°时,均为延性破坏.采用峰值强度、等效破坏角、峰值轴向应变、峰值环向应变来反演煤样黏聚力和内摩擦角的方法可以获得单个煤样的力学参数,与实测相吻合,体现了煤样的离散特征.
Based on the concept of equivalent fracture angle, the law of shear failure of coal sample and its main influencing factors were analyzed by using orthogonal analysis theory.The results showed that there were 4 types of fracture in coal sample, with the internal friction angle And the confining pressure are reduced, the order of easy destruction is single shear failure, conjugate rupture, tensile shear failure and ductile failure. The failure angle of coal sample decreases with the increase of internal friction angle and confining pressure. When the internal friction angle is 45 °, it is both single shear failure and the internal friction angle is 15 °, all of them are ductile failure.The peak strength, equivalent failure angle, peak axial strain , Peak circumferential strain to retrieve the cohesion and internal friction angle of coal samples can be obtained by a single coal mechanical parameters, consistent with the measured, reflecting the discrete characteristics of coal samples.