煤与瓦斯突出过程中地应力、瓦斯压力作用机理探讨  

Explore the mechanism of ground stress and gas pressure in coal-gas outburst

作　　者：朱立凯[1,2] 杨天鸿 徐涛[1] 赵国会[2] 谢正红 ZHU Likai;YANG Tianhong;XU Tao;ZHAO Guohui;XIE Zhenghong(Center for Rock Instability and Induced Seismicity Research,Northeast University,Shenyang,Liaoning 110819,China;Shenyang Research Institute of China Coal Science and Industry Group,Shenyang,Liaoning 110016,China)

机构地区：[1]东北大学岩石破裂与失稳研究中心,辽宁沈阳110819 [2]煤科集团沈阳研究院有限公司,辽宁沈阳110016

出　　处：《采矿与安全工程学报》2018年第5期1038-1044,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51374049);中央高校基本科研业务费项目(N110201001)

摘　　要：基于煤岩破裂损伤理论和气固耦合方法,针对不同地应力和不同瓦斯压力条件,采用RFPA2D-Flow数值计算软件对煤与瓦斯突出发生、发展过程进行数值研究,获得了煤体裂纹孕育、扩展演化规律及突出孔洞变化特征,并结合红阳二矿、西马煤矿突出实例进行验证分析。研究表明:地应力与煤与瓦斯突出发生所需的最小瓦斯压力呈线性反比关系,地应力越高突出所需的瓦斯压力越小;高地应力条件下煤与瓦斯突出的初始阶段,煤体主要在剪-拉应力作用下,形成以"–"型和"I"型裂纹组成的网格型裂纹,宏观破坏呈楔形分布,而较低地应力条件下煤与瓦斯突出的初始阶段,煤体主要在拉应力作用下,形成"I"型裂纹,宏观破坏呈环状分布;突出过程中地应力的作用使煤体破坏以楔形方式发展,瓦斯的作用使煤体破坏以弧形方式发展,突出孔洞的最终形状由地应力和瓦斯共同决定。Based on the coal rock failure damage theories analysis and gas-solid coupling method, the coal and gas outburst development processes under different gas pressures and ground stress conditions are simulated using the RFPA^（2D）-Flow software. The evolution of coal failure such as initial damage, crack propagation, shape of hole and other prominent damage features are obtained by numerical experiments and the results are validated by examples of outburst happened in Hongyang and Xima coal mine. The research shows that the limited gas pressure of outburst is inversely proportional to the ground stress, the greater the ground stress is, the smaller the gas pressure required for an outburst is. When the shapes of ＂–＂ micro cracks and ＂I＂ micro cracks engendered by shear-tensile stress form cross connection cracks, the distribution zone of macro fractures begins to emerge and form the shape of wedge damage area in the initialization phase of outburst under high ground stress conditions, damage area in the initialization phase of outburst under high ground stress conditions, while the ＂I＂ cracks are engendered by tensile stress, the distribution zone of macro fractures begin to emerge and form shape of hemispherical damage area under low ground stress and high gas pressure conditions. The shape of damage area and outburst hole extend towards wedge by the effect of ground stress while extend towards half arc shape by the effect of gas pressure. The final shape of outburst hole is the result of combined effects.

关 键 词：煤与瓦斯突出 瓦斯压力 数值模拟 气固耦合 

分 类 号：TD353[矿业工程—矿井建设]