三轴压缩煤样破坏规律及剪切强度参数的反演

发布时间：2018-09-12 10:02

【摘要】：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.
[Abstract]:Based on the concept of equivalent fracture angle, the shear failure law of coal sample and its main influencing factors are analyzed by orthogonal analysis theory. The results show that there are four types of fracture in coal samples. With the decrease of internal friction angle and confining pressure, the order of failure is single shear failure, conjugate fracture, tensile shear failure and ductile failure. The failure angle of coal samples decreases with the increase of the internal friction angle and confining pressure, and increases with the increase of the shear expansion angle, and is ductile when the internal friction angle is 45 掳and the internal friction angle is 15 掳. By using the methods of peak strength, equivalent failure angle, peak axial strain and peak circumferential strain to invert the cohesion and internal friction angle of coal sample, the mechanical parameters of a single coal sample can be obtained, which is consistent with the measured data and reflects the discrete characteristics of coal sample.
【作者单位】：中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;辽宁工程技术大学辽宁省煤炭资源安全开采与洁净利用工程研究中心;中国矿业大学(北京)资源与安全工程学院;安徽理工大学;煤炭开采国家工程技术研究院;中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家“十二五”科技支撑计划项目(2013BAB02B01) 国家自然科学基金项目(41272347) 北京市自然科学基金项目(8174072) 辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金项目(LNTU16KF08) 煤炭资源与安全开采国家重点实验室开放基金项目(SKLCRSM16KFB07) 国家重点研发计划项目(2016YFC0801401)
【分类号】：TD315

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