Study on effect of dip angle on coal wall spalling of working face with great mining height in steeply inclined coal seam

被引：0
|
作者：
Wang H. [1 ,4 ]
Wu Y. [1 ]
Jiao J. [1 ]
Luo S. [2 ]
Liu K. [3 ]
Xie P. [1 ]
Liu M. [1 ]
机构：
[1] Key Laboratory of Western Mine Exploitation and Hazard Prevention, School of Energy Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi
[2] School of Science, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi
[3] Chongqing Energy (Guizhou) Coal Co Ltd, Bijie, 551700, Guizhou
[4] Sichuan Coal Industry Group Limited Liability Company, Chengdu, 610091, Sichuan
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 04期
关键词：
Coal wall spalling; Dip angle change; Great mining height; Horizontal displacement; Steeply inclined coal seam;
D O I：
10.13545/j.cnki.jmse.2019.04.011
中图分类号：
学科分类号：
摘要：
Comprehensive methods including field test, theoretical analysis and numerical simulation were adopted to analyze main control parameters for coal wall spalling of working face with great mining height in 2130 coal mine of Xinjiang coking coal group. The mechanical model of coal wall along tendency was established. Meanwhile, the mechanism of effect of working-face dip angle on coal wall spalling was revealed. Results show that main control parameters for coal wall spalling of working face with great mining height in steeply inclined seam include dip angle, mining height, advancing speed, support resistance, cohesion and internal friction angle of coal mass. Affected by dip angle of working face, the abutment pressure in coal wall is asymmetric along inclination, which leads to asymmetry of coal wall deformation. The largest deformation occurs at location of about 0.66L in upper area of working face. With the increase in dip angle, vertical stress in coal wall increases gradually. The horizontal displacement of coal wall in upper area of working face continuously increases towards the goaf, and moves to inclined upper area. This could increase the coal spalling probability and potential areas. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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