突出过程中煤层瓦斯压力与温度演化规律研究  

Study of evolution law of gas pressure and temperature in coal seam during outburst

作　　者：许江[1] 杨孝波 周斌[1] 彭守建[1] 程亮[1] 闫发志 XU Jiang;YANG Xiaobo;ZHOU Bin;PENG Shoujian;CHENG Liang;YAN Fazhi(State KeyLaboratoryof Coal Mine Disaster Dynamics and Control,ChongqingUniversity,Chongqing400044,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室

出　　处：《中国矿业大学学报》2019年第6期1177-1187,共11页Journal of China University of Mining & Technology

基　　金：国家科技重大专项项目(2016ZX05044-002);国家自然科学基金项目(51874055);中国博士后科学基金项目(2018M633317)

摘　　要：为进一步认识煤与瓦斯突出发生机理,开展了气-固耦合条件下的煤与瓦斯突出物理模拟试验,并监测了突出过程中煤层瓦斯压力与温度.结果表明:突出过程中煤层压降区近似以突出口为中心的圆弧型向煤层深部扩展;突出口附近煤体在地应力作用下受到拉伸破坏,瓦斯的存在加速了该破坏过程,同时使煤体内瓦斯压力下降速度最快,达1.5 MPa/s;突出过程中煤体温度下降是由瓦斯膨胀做功和解吸造成的,观察期内,煤体温度最大下降量达8.29 K;突出过程是一个热力多变过程,突出过程中瓦斯膨胀做功随着煤体内温度变化量的增加而增大,参与膨胀做功的瓦斯气体量也随之增加.To further understand the mechanism of coal and gas outburst, the physical simulation test of coal and gas outburst under gas-solid coupling was carried out.And the gas pressure and temperature of coal seam during the outburst were monitored. The results show that the pressure drop zone of coal seam in outburst process is similar to the arc-shaped, meanwhile,it extends from the center of the outburst orifice to the deep coal seam. The coal mass near the outburst orifice is subjected to tensile failure under the action of ground stress, and the existence of gas accelerates the destruction process. The decline of gas pressure in the coal seam to be the largest, reach to 1.5 MPa/s. The decline of temperature during the outburst is caused by gas expansion and desorption. During the observation period, the maximum decrease of temperature reach 8.29 K. The outburst process is a polytropic process, in which, the gas expansion work increases with the increase of the temperature change in the coal seam, and moreover, the amount of gas involved in the expansion work also increases.

关 键 词：煤与瓦斯突出 瓦斯压力 煤体温度 膨胀做功 多变过程 

分 类 号：TD324[矿业工程—矿井建设]