The “relative movement" deformation mechanism and control technique of gob-side entry retaining in top-coal caving mining

被引：0
|
作者：
Yang H. [1 ,2 ]
Ju W. [1 ,2 ]
Wang D. [1 ,2 ]
Su C. [1 ,2 ]
机构：
[1] Coal Mining Branch, China Coal Research Institute, Beijing
[2] CCTEG Coal Mining Research Institute, Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2023年 / 40卷 / 02期
关键词：
deformation control; gob-side entry retaining in top-coal caving mining; support and pressure relief; surrounding rock damage;
D O I：
10.13545/j.cnki.jmse.2022.0561
中图分类号：
学科分类号：
摘要：
In order to solve the problems such as strong mining pressure and large deformation of the surrounding rock or large amount of repair work in thick coal seam gob-side entry retaining, this research takes Tang'an coal mine in the Jincheng mining area as the engineering background, analyzes the defor-mation and damage characteristics of gob-side entry retaining, and proposes the control measures and corresponding technical solutions, by the method of underground observation, theoretical analysis and engineering test. Finally, the control measures are verified in the field. The research results show that the deformation of gob-side entry retaining is mainly manifested as the sinking of top coal, the splitting and skewing of roadside support, and the deformation of coal side and floor heave. The deformation and damage of the surrounding rock at different position shows an overall correlation. The deformation of the surrounding rock shows an overall “dislocation" mechanism. The deformation is mainly controlled by roof rotation and outward lateral movement, the inward deflection of the floor under horizontal stress. Under the combined action of the roof, floor, coal side, and roadside support, a “dislocation" deformation pattern towards the mining area is formed. Based on the “dislocation" deformation characteristics of the gob-side entry retaining, the following control measures are proposed, which mainly include thin and high strength concrete roadside support with pre-set angle, roof and coal side reinforcement support, the reinforcement support of retaining roadway “roof cutting control", regional hydraulic pre-cracking to pressure relief at the advance roof of the working face. Field tests and monitoring of the control measures show that the roof in the goaf is broken in time, the stress environment of the gob-side entry retaining is obviously improved, the roadside support is intact, and the effect of deformation control is remarkable. © 2023 China University of Mining and Technology. All rights reserved.
引用
收藏
页码：224 / 231
页数：7
相关论文
共 23 条
  • [1] pp. 1-20, (1982)
  • [2] pp. 16-36, (1993)
  • [3] KANG Hongpu, ZHANG Xiao, WANG Dongpan, Et al., Strata control technology and applications of non-pillar coal mining, Journal of China Coal Society, 47, 1, pp. 16-44, (2022)
  • [4] HUA Xinzhu, Development status and improved proposals on gob-side entry retaining support technology in China, Coal Science and Technology, 34, 12, pp. 78-81, (2006)
  • [5] WANG Wenyong, GAO Mingzhong, WANG Man, Et al., Study on characteristics of deformation and stress distribution of gob-side entry retaining in the ultra-deep mine, Chinese Journal of Rock Mechanics and Engineering, 38, 1, pp. 2955-2963, (2019)
  • [6] HAN Changliang, ZHANG Nong, LI Guichen, Et al., Bed separation mechanism under sequential roof collapse condition in a gob-side entry retaining, Journal of China University of Mining & Technology, 41, 6, pp. 893-899, (2012)
  • [7] HAN C L, ZHANG N, RAN Z, Et al., Superposed disturbance mechanism of sequential overlying strata collapse for gob-side entry retaining and corresponding control strategies [ J ], Journal of Central South University, 25, 9, pp. 2258-2271, (2018)
  • [8] WANG Kai, YANG Baogui, WANG Pengyu, Et al., Study on deformation and failure characteristics of gob-side entry retaining in soft and thick coal seam and the control technology, Rock and Soil Mechanics, 43, 7, pp. 1913-1924, (2022)
  • [9] FENG Guorui, REN Yuqi, WANG Pengfei, Et al., Stress distribution and deformation characteristics of roadside backfill body for gob-side entry of fully-mechanized caving in thick coal seam, Journal of Mining & Safety Engineering, 36, 6, pp. 1109-1119, (2019)
  • [10] YUAN Ruifu, LIU Yinxian, LI Chunjie, Gob-side entry retaining method of avoid mining abutment pressure and its application in fully mechanized caving with three soft coal seam, Journal of Henan Polytechnic University (Natural Science), 35, 5, pp. 612-619, (2016)
123