Fracture characteristics of the roof in gob-side entry retaining withroof cutting and pressure release

被引：0
|
作者：
Yang J. [1 ]
Wang H. [1 ,2 ]
Wang Y. [1 ,3 ]
Gao Y. [1 ]
Wang J. [4 ]
Liu H. [4 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing
[2] School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing
[3] College of Civil Engineering, Tongji University, Shanghai
[4] ShenmuNingtiaota Coal Mining Company Ltd, Shaanxi Coal and Chemical Industry Group Company Ltd, Yulin, 719300, Shaanxi
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 06期
关键词：
Gob-side entry retaining; Key blocks; Pressure release by roof cutting; Roof cutting; Roof fracture;
D O I：
10.13545/j.cnki.jmse.2019.06.009
中图分类号：
学科分类号：
摘要：
In order to study the influence of different fracture positions in the main roof on the deformation of roadway under the conditions of the gob-side entry retaining with roof cutting and pressure release, the movement characteristics of roof rock strata has been analyzed, and the mechanical models of different main roof fracture positions have been established. In addition, the calculation formula of the temporary support strength of the main roof at different fracture locations has been derived, and the critical value of the temporary support strength in the roadway has been obtained. The discrete element numerical software UDEC has been used to simulate the movement of rock under different fracture positions. The results have shown that the main roof fractures on the solid coal side and the goaf side, and the deformation of the roadway is small, whereas the serious deformation and damage occurs when the fracture is above the roadway. The deformation of the lower roof is controlled by adjusting the support force of the roof-cutting support, so that the main roof tends to fracture in a favorable position. The deformation of the roadway can be effectively controlled by the technique of roof-cutting support, constantresistance and large deformation anchor cable support, and it is successfully applied in theworking face S1201-II of Ningtiaota coal mine. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：1137 / 1144
页数：7
相关论文
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