南山煤矿大倾角煤层群开采覆岩移动破坏规律  

Movement and failure law of overlying rock during mining of large dip coal seam group in Nanshan Coal Mine

作　　者：王正帅 Wang Zhengshuai(CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《能源与环保》2023年第12期275-279,288,共6页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：新疆维吾尔自治区自然科学基金面上项目(2022D01C38)。

摘　　要：为了掌握南山煤矿大倾角煤层群开采时基本顶破断规律、下部煤层开采覆岩移动破坏规律及其对上覆煤层的影响,理论计算了基本顶破断步距,采用理论计算、数值模拟和相似模拟实验研究了下部B4煤层开采覆岩破坏规律及其对上覆B8煤层的影响。研究表明,将弹性双向板简化为固支梁和悬臂梁计算B4工作面基本顶初次断裂步距为46.4 m,周期破断步距为18.9 m,与相似模拟实验结果相近;B4煤层覆岩破坏范围受倾角影响呈现不对称特性,工作面上端部覆岩破坏高度明显大于下端部;B4煤层开采会影响B8煤层,但影响程度不同,在最小层间距时影响最大,此时B8煤层工作面上端部区域会处于B4煤层覆岩裂隙带上部;B4煤层回采时采场来压强度属于明显—强烈,动载系数为1.28~1.53。In order to master the basic roof breaking law,the movement and failure law of overlying rock in the mining of the lower coal seam and its impact on the overlying coal seam when mining the large dip coal seam group,the basic roof breaking step was calculated in theory,and the overlying rock failure law in the mining of the lower B4 coal seam and its impact on the overlying B8 coal seam were studied by theoretical calculation,numerical simulation and similar simulation experiments.Research showed that simplifying the elastic bi-directional plate into a fixed supported beam and a cantilever beam results in a B4 working face with an initial fracture step distance of 46.4 m and a periodic fracture step distance of 18.9 m,which was similar to similar simulation experimental results.The overlying rock failure range of B4 coal seam was asymmetric affected by the dip angle.The overlying rock failure height at the upper end of the working face was significantly higher than that at the lower end.The mining of B4 coal seam affects B8 coal seam,but the degree of impact was different.The impact was greatest at the minimum interlayer spacing,and at this time,the upper end area of the working face of B8 coal seam was located in the upper part of the overlying rock fracture zone of B4 coal seam.During the recovery of B4 coal seam,the pressure intensity in the mining area was obvious to strong,with a dynamic load coefficient of 1.28~1.53.At this time,the upper area of the working face of B8 coal seam was located in the upper part of the overburden fissure belt of B4 coal seam.When B4 coal seam was mined,the stope pressure intensity was obvious to strong,and the dynamic load coefficient was 1.28~1.53.

关 键 词：大倾角煤层群 覆岩移动规律 破断步距 采场来压 动载系数 

分 类 号：TD323[矿业工程—矿井建设]