Study on rational width of protective coal pillar for district dip in rock burst mine

被引：0
|
作者：
Liu J. [1 ]
Zheng X. [2 ]
Liu H. [3 ]
Wang Y. [2 ]
Lu X. [3 ]
Wang W. [2 ]
机构：
[1] Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Beijing
[2] Shandong Lilou Coal Industry Co., Ltd., Heze
[3] Shandong Energy Group Co., Ltd., Jinan
来源：
Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2021年 / 49卷 / 02期
关键词：
District dip; Micro-seismic monitoring; Protective coal pillar; Rock burst; Stress monitoring;
D O I：
10.13199/j.cnki.cst.2021.02.007
中图分类号：
学科分类号：
摘要：
The key to prevent roek burst in district dip is to reserve a protective coal pillar with a reasonable width. In order to discuss the determination method oi protective coal pillar width in mining area oi rock burst mine, determining reasonable width oi protective coal pillar lor district dip in Lilou Mine is taken as an engineering background. Movement law oi overlying strata, evolution feature of abutment pressure and mechanism of rock burst in the advancing process of working face to the district dip are investigated by using ground pressure theory. The microseismic monitoring data and stress dynamic monitoring data in the process of working face advancing are analyzed. The influence range of working face in Lilou Mine is determined comprehensively. A comprehensive method to determine the width of protective coal pillar for district dip based on the principle of preventing all kinds of rock burst is put forward, and the engineering verification is earned out. The results show that:(1) With the working face advancing to the district dip and the lessening of protective coal pillar width, the advance abutment pressure of working face and the lateral abutment pressure of district dip, or the advanced abutment pressure of two wing working faces, will be superimposed and concentrated, and the superposition degree of vibration additional stress and lateral abutment pressure of district dip gradually increases. (3)Three types of rock burst may occur in the district dip, including static and dynamic load superposition type, stress superposition type and creep type. (3)The influence distance of advanced and delayed mining is 235 m, and the influence distance of lateral mining is 105. 5 m. (4)From the point of view of preventing three types of rock burst including static and dynamic load superposition type, stress superposition type and creep type, the width of protective coal pillar at one side for district flip in Lilou Mine should not be less than 235 m. The field monitoring results and ending situation in the late mining period preliminarily verified the rationality of 240 m protective coal pillar at one side of district dip in Lilou Mine. © 2021 Meitan Kexun Jishu/Coal Science and Technology (Peking). All rights reserved.
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页码：52 / 60
页数：8
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