High development characteristics of water flowing fractured zone in fully-mechanized top-caving mining of extremely thick coal seam under water

被引：0
|
作者：
Li X. [1 ,2 ,3 ]
Huang Q. [1 ,3 ]
机构：
[1] School of Energy Engineering, Xi'an University of Science and Technology, Xi'an
[2] Shaanxi Railway Institute, Weinan
[3] Key Laboratory of Western Mine and Hazard Prevention, Ministry of Education, Xi'an
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2022年 / 39卷 / 01期
关键词：
Deformation analysis method; Extremely thick coal seam; Full-mechanized top-caving mining; Key stratum; Numerical simulation; Water flowing fractured zone;
D O I：
10.13545/j.cnki.jmse.2020.0442
中图分类号：
学科分类号：
摘要：
With fully-mechanized top-caving mining under Beirui River in working face 3203 of Chenjiagou Coal Mine as research object, the height of water flowing fractured zone in the working face was studied through deformation analysis and numerical simulation. Research results have shown that maximum height (124 m) of water flowing fractured zone with full-mechanized top-caving mining of working face 3203 appears on the side of open-off cut with fracture mining ratio of 11.7; final shape of water flowing fractured zone is a deviated "saddle". The structure of overlying rock has a significant impact on characteristics of water flowing fractured zone, and development height of water flowing fractured zone increases stepwise with periodic breakage of key stratum in overlying strata. When water flowing fractured zone develops to a certain level, the soft rock of certain thickness in the overlying strata is the key rock layer (inhibition layer) that inhibits continuous upward development of water flowing fractured zone. Therefore, according to structural characteristics of overlying strata, it is more practical to determine the height of water flowing fractured zone by partition area. Based on the predicted result of aquifer fracture zone height, the original mining plan of working face 3203 was revised, and a plan for total top coal release was proposed, which improves the resource recovery rate. © 2022, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：54 / 61
页数：7
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