Study on Deformation Characteristics of Coal Roof Overlapping Mining under the Coverage of Magmatic Rocks with DEM Simulation
It is more complex in roof rock damage of many coal seams by overlapping mining under the coverage of magmatic rocks than that of the single coal seam. The paper simulates the deformation-failure of roof on caving of overlapping face using DEM method to obtain deformation-failure development law. The correlation of cover rock construction feature and directional distribution of bed-separated fissures in caving is researched, and the distribution features of stress on overburden rock and deformation-failure development law of many coal seams by overlapping mining under the coverage of hard rocks are summarized. Stress concentration occurs obviously in upper part of Magmatic rocks above coal7 after coal7 mining, during the course of coal8 mining. Overlapping mining leads to increasing the height of coal seam roof destruction obviously. The results are the reasons why the possibility of conducting the upper aquifers and the water-inrush accident are increased. This research result is supposed to improve the level of water hazard prevention under aquifers. At the same time, the theory of deformation and failure of overlying rock has been enriched in coal seam mining.
The coverage of magmatic rocks DEM method overlapping mining bed-separated fissures roof deformation
LIU Qi-meng LI Wen-ping LI Xiao-qin HU Ge
College of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221008, Chi Shandong Institute and Laboratory of Geological Sciences, Jinan 250013,China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
48-53
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）