Types, occurrence mechanisms and prevention techniques of roof disasters in fully-mechanized top coal caving face

被引：0
|
作者：
Xu G. [1 ,2 ,3 ]
Zhang C. [4 ]
Zhang Z. [1 ,2 ,3 ]
Liu X. [1 ,2 ,3 ]
Feng Y. [1 ,2 ,3 ]
Lin X. [1 ,2 ,3 ]
Ma R. [1 ,2 ,3 ]
Liu Q. [1 ,2 ,3 ]
Li Z. [1 ,2 ,3 ]
机构：
[1] Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd., Beijing
[2] CCTEG Coal Mining Research Institute, Beijing
[3] Coal Mining and Designing Branch, China Coal Research Institute, Beijing
[4] Hebei Technological Innovation Center of Disaster Prevention and Mitigation Engineering of Geotechnical and Structural System, Hebei University of Science and Technology, Shijiazhuang
来源：
Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2023年 / 51卷 / 02期
关键词：
fully-mechanized top coal mining; hard roof; roof cutting and supports crushing; roof disaster; soft roof; stope support;
D O I：
10.13199/j.cnki.cst.2022-1634
中图分类号：
学科分类号：
摘要：
The excavation thickness of the coal seam and the corresponding motion space of the overlying strata are so large in the fully-mechanized top coal caving face, that roof accidents are occur easily. In order to understand the mechanism of roof disasters in fully-mechanized caving working face, some cases of roof disasters in fully-mechanized caving working face are statistically analyzed. According to the roof conditions and disaster characteristics, the roof disasters in fully-mechanized caving working face are divided into two types: large-area roof cutting and support crushing for soft roof, large-area roof collapse with roof cutting and support crushing for hard roof. Taking Cuimu Мine and Caojiatan Мine as examples, the characteristics of two types of roof disasters are analyzed, and the corresponding roof disaster mechanism is presented: The roof in soft roof working face is of weak cementation. If the actual support stiffness is insufficient, the roof will break at the coal wall, and is easy to be unstable after breaking. As the same time, the insufficient support strength eventually leads to the leads to cutting and support crushing disaster of roof. The roof in hard roof working face is of good integrity and is not easy to break. When the suspended roof area is enough, the sudden breaking of roof will cause an impact on the support. If the breaking line is at the coal wall, it will easily leads to cutting and support crushing disaster of roof. Combined with engineering practice, prevention and control measures for two types of roof disaster are presented. For the soft roof working face, the measures such as reasonably improving the support stiffness, the supporting efficiency and the advancing speed of the working face, and the early warning and so on are used to prevent the occurrence of large-scale roof cutting and support crushing. For the hard roof working face, in addition to support management and rational mining design, it is necessary to improving roof conditions. For examples, the regional hydraulic fracturing technology is used to weaken the roof and prevent large-area roof collapse and support crushing disasters. © 2023 Coal Science and Technology. All rights reserved.
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页码：44 / 57
页数：13
相关论文
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  • [1] KANG Hongpu, XU Gang, WANG Biaomou, Et al., Forty years development and prospects of underground coal mining and strata control technologies in China, Journal of Мining and Strata Control Engineering, 1, 2, pp. 7-39, (2019)
  • [2] WANG Jiachen, Fully mechanized longwall top coal caving technology in China and discussion on issues of further development, Coal Science and Technology, 33, 1, pp. 14-17, (2005)
  • [3] YAN Shaohong, XU Gang, ZHANG Xueliang, Et al., Reason analyses on large area roof cutting and collapse of hydraulic supports at fully-mechanized top coal caving mining face in ultra thick coal seams, Coal Science and Technology, 43, 6, pp. 14-18, (2015)
  • [4] YANG Junzhe, ZHENG Kaige, WANG Zhenrong, Et al., Technology of weakening and danger-breaking dynamic disasters by hard roof, Journal of China Coal Society, 45, 10, pp. 3371-3379, (2020)
  • [5] YANG Junzhe, ZHENG Kaige, The mechanism of overburden dynamic disasters and its control technology in top-coal caving in the mining of thick coal seams, Journal of Мining & Safety Engineering, 37, 4, pp. 750-758, (2020)
  • [6] HUANG Bingxiang, ZHAO Xinglong, CHEN Shuliang, Et al., Theory and technology of controlling hard roof with hydraulic fracturing in underground mining, Chinese Journal of Rock Мechanics and Engineering, 36, 12, pp. 2954-2970, (2017)
  • [7] NING Jing, XU Gang, ZHANG Chunhui, Et al., Мechanical model and fracturing characteristics of multi-area supporting roof in fully mechanized mining working face, Journal of China Coal Society, 45, 10, pp. 3418-3426, (2020)
  • [8] XU Gang, ZHANG Chunhui, LIN Xingyu, Et al., Predicting ground pressure evolution and support crushing of fully mechanized top coal caving face based on zoning support mechanical model, Journal of China Coal Society, 47, 10, pp. 3622-3633, (2022)
  • [9] YANG Ke, LIU Wenjie, JIAO Biao, Et al., Three-dimensional physical simulation of overburden migration in deep thick hard roof fully-mechanized caving mining, Chinese Journal of Geotechnical Engineering, 43, 1, pp. 85-93, (2021)
  • [10] DU Keke, WU Shuai, Strong ground pressure behavior and prevention technology of fully mechanized caving face in upper thick and hard rock strata, Coal Science and Technology, 49, pp. 25-29, (2021)
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