论文部分内容阅读
为了实现瓦斯的高效抽放,解决煤与瓦斯的安全共采问题,采用相似模拟试验和岩石破裂分析系统(RFPA2D)数值计算方法,研究受采动影响的上覆岩层裂隙发育规律和瓦斯渗流规律。结果表明,随着开采工作面推进,顶板出现周期性垮落,老顶垮落步距约为12m,其顶板破断角度约为50°,工作面和切眼上方裂隙发育基本对称,覆岩下沉曲线整体呈左右对称碗状;在卸压带内,煤体膨胀变形生成的大量次生裂隙,增加了煤体的渗透性,覆岩横向离层裂隙和竖向破断裂隙的动态发育变化,为实现煤与瓦斯的共采创造条件。为进一步理解采动影响下煤与瓦斯共采提供了理论基础和科学依据。
In order to realize the efficient gas drainage and solve the problem of total coal and gas safety, a similar simulation test and numerical analysis method of rock fracture analysis (RFPA2D) are used to study the law of fracture development and the law of gas seepage . The results show that with the advancing of mining face, the roof appears periodic collapse, the roof collapse step is about 12m, the roof breaking angle is about 50 °, and the fracture development is basically symmetrical on the working face and undercut. The whole curve of the curve is symmetrical bowl; in the pressure relief zone, a large number of secondary cracks generated by the expansion and deformation of coal increase the permeability of coal, the dynamic development of lateral fissure and vertical fracture of overburden, To achieve a total of coal and gas mining conditions. This study provides a theoretical basis and a scientific basis for further understanding of coal mining and methane co-mining under the influence of mining.