Instability Control of Roadway Surrounding Rock in Close-Distance Coal Seam Groups under Repeated Mining

被引:19
|
作者
Xiong, Yu [1 ]
Kong, Dezhong [1 ,2 ]
Cheng, Zhanbo [3 ]
Wen, Zhijie [2 ,4 ]
Ma, Zhenqian [1 ]
Wu, Guiyi [1 ]
Liu, Yong [1 ]
机构
[1] Guizhou Univ, Coll Min, Guiyang 550025, Peoples R China
[2] Key Lab Min Disaster Prevent & Control, Qingdao 266590, Peoples R China
[3] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England
[4] Shandong Univ Sci & Technol, Coll Energy & Min Engn, Qingdao 266590, Peoples R China
基金
中国国家自然科学基金;
关键词
close-distance coal seam groups; roadway surrounding rock; stability control; physical similarity simulation; digital image correlation; numerical simulation; ROOF; DEFORMATION; STABILITY; LAWS;
D O I
10.3390/en14165193
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In order to solve the problems of roadway stability and easy instability under repeated mining of close-distance coal seam groups, the mechanism and control technology of surrounding rock instability under repeated mining were studied via indoor testing, field testing, physical similarity simulation experiment, and numerical simulation. The results show that the surrounding rock of roadway has low strength, low bearing capacity, and poor self-stabilization ability, and it is vulnerable to engineering disturbances and fragmentation. Affected by the disturbance under repeated mining, the roadway surrounding rock cracks are developed and the sensitivity is strong, and it is prone to large-scale loose and destroyed. The location of the roadway is unreasonable, and the maximum principal stress of the roadway is 3.1 times of the minimum principal stress, which is quite different. Thus, under a large horizontal stress, the surrounding rock undergoes long-range expansion deformation. On the basis of this research, the direction and emphasis of stability control of roadway surrounding rock under repeated mining of coal seam groups in close-distance are shown. A repair scheme (i.e., long bolt + high-strength anchor cable + U-shaped steel + grouting) is proposed, and reduces the risk of roadway instability.
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页数:19
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