煤岩组合体力学模型及细观损伤过程的颗粒流分析
Mechanical Model of Coal and Rock Mass and Particle Flow Analysis of Mesoscopic Damage Process
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摘要: 为了研究煤岩组合体变形破坏的问题，在工程体与地质体两体力学模型的基础上，总结分析了煤岩两体接触面的力学特性及煤岩两体力学模型的变形破坏过程；利用颗粒离散元程序PFC建立了煤岩组合体平行黏结数值模型，对单轴压缩过程中，组合体内部细观裂纹的生成和扩展过程进行了分析探讨。结果表明：由于煤岩交界面对煤体变形破坏的抑制作用，煤岩体的变形破坏过程是煤体先损伤破坏，岩体再损伤破裂，直至整体失稳破坏的渐进式破坏过程。Abstract: To research the deformation and failure of coal-rock combined body, based on the engineering and geological model, the mechanical properties of contact surface of coal-rock combined body were analyzed and summarized in this paper. Parallel bond numerical model of coal-rock combined body was established based on particle discrete element program, and generation and propagation process of mesoscopic cracks are analyzed under the uniaxial compression. Results showed that the deformation and failure process of coal and rock mass is the progressive failure process of coal body damage first, rock body damage and fracture until the overall instability due to the restraining effect of coal-rock interface on the deformation and failure of coal body.
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