摘要
为获知单侧采空工作面煤层底板采动破坏规律,分别采用数值模拟和微震监测技术研究某矿81307工作面底板采动破坏特征。研究结果表明:81307工作面采空区侧底板潜在损伤区范围大于实体煤侧,两侧底板潜在破坏深度分别为45,25 m,工作面煤壁前方底板应力场扰动范围约50 m,扰动深度约22 m。底板微震事件集中在81307工作面采空区侧,并向工作面中部延伸90 m左右,最大破坏深度约32 m。工作面宽度方向,底板破坏区近似为1个倾斜矩形面,与+X方向夹角16.5°。数值模拟、微震监测结果在81307工作面两侧底板差异化破坏深度、方向及工作面煤壁前方底板破坏趋势等方面吻合程度高。研究结果可为相关矿井底板防治水提供现场指导作用。
To study the mining-induced failure law of coal seam floor in the unilateral mined-out face,the numerical simulation and microseismic monitoring technology were applied respectively to study the floor mining-induced failure characteristics of No.81307 working face in a mine.The results showed that the potential damage area of the floor on the side adjacent to goaf at No.81307 working face was significantly larger than that on the side adjacent to solid coal.The potential damage depth of the floor on the above two sides were 45 m and 25 m,respectively.The disturbance range of the floor stress field in front of the coal wall of working face was about 50 m,and the disturbance depth was about 22 m.The floor microseismic events were mainly distributed on the side adjacent to goaf at No.81307 working face,then extended about 90 m to the middle of working face,and the maximum failure depth was about 32 m.In the width direction of working face,the floor failure zone was approximately an inclined rectangular surface,and the angle with the+X direction was 16.5°.The numerical simulation and the microseismic monitoring results agreed well with each other in terms of the differential failure depth and failure direction of floor on both sides of working face and the failure trend of floor in front of coal wall of the working face.The results can provide field guidance for floor water prevention and control in similar coal mines.
作者
吴雪菲
李红霞
朱梦博
WU Xuefei;LI Hongxia;ZHU Mengbo(School of Energy Engineering,Xi’an University of Science and Technology,Xi’an Shaanxi 710054,China;CCTEG Xi’an Research Institute(Group)Co.,Ltd.,China Coal Technology&Engineering Group,Xi’an Shaanxi 710077,China;School of Management,Xi’an University of Science and Technology,Xi’an Shaanxi 710054,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2023年第4期78-85,共8页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(U1904210)
山西省科技厅重点研发项目(2021SF-479)。
关键词
微震监测
数值模拟
煤层底板
奥灰水
破坏深度
microseismic monitoring
numerical simulation
coal seam floor
Ordovician limestone water
damage depth
