基于颗粒离散元模型的煤岩组合体损伤演化规律研究  

Research on Damage Evolution Laws of Rock-coal-rock Combination Based on Particle Discrete Element Model

作　　者：何涛[1] 王丽[2] HE Tao;WANG Li(Tianjin Vocational Institute,Tianjin 300410,China;1nstitute of Engineering and Technology,Hulunbuir College,Hulunbuir 021008,China)

机构地区：[1]天津职业大学,天津300410 [2]呼伦贝尔学院工程技术学院,内蒙古呼伦贝尔021008

出　　处：《煤矿安全》2018年第7期205-208,共4页Safety in Coal Mines

摘　　要：基于颗粒离散元程序建立了"岩体-煤体-岩体"平行黏结数值模型,通过改变中间煤体部分的厚度,探讨了不同煤体厚度对组合体力学特性和破坏特征的影响,并从损伤裂纹扩展演化的过程和不同介质相互作用的力学角度2方面进一步分析了组合体变形破坏过程的一般规律。研究结果表明:煤岩组合体的破坏主要集中于中间煤体部分,尤其煤岩交界面处的破坏最为剧烈;煤岩组合体的破坏以45°~60°角的剪切破坏为主,并且随着中间煤体厚度的减小,组合体的单轴抗压强度和弹性模量呈逐渐增大的趋势;煤岩组合体的变形破坏过程可分为整体线性变形、煤体非线性变形、煤体峰值破坏及煤岩整体失稳破坏4个阶段。The＂rock-coal-rock＂parallel bond numerical model is established based on the particle flow code（PFC）. By changing the thickness of the middle part of coal, this paper discusses the influence of different coal thickness on the mechanical characteristics and failure characteristics of combination and further analyzes the general law of combination deformation and failure process from the propagation evolution of crack extension. The results show that the failure of coal-rock combination mainly concentrates on the middle part of coal, especially at the interface between coal and rock; combination of coal and rock damage at the angle range of 45 ° to 60 ° is shear failure, and with the decrease of coal thickness, the uniaxial compressive strength and elastic modulus of combination is increased gradually; the failure process of coal-rock combination is a progressive failure process.

关 键 词：煤岩组合体 力学特性 破坏形态 颗粒流 损伤演化 

分 类 号：TD315[矿业工程—矿井建设]