Pressure bearing and deformation of the surrounding rock-support body and control technology on the gangue side in gob side entry retaining #br#
by roof cutting
(1. School of Energy and Mining Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；2. State Key Laboratory of Water Resource Protection and Utilization in Coal Mining，National Institute of Clean and Low Carbon Energy，Beijing 102209，China)
Abstract：Studies show that the stability of gangue side surrounding rock in gob side entry retaining by roof cutting affects the formation effectiveness and reusability of roadways. In this regard，various methods such as on-site investigations，theoretical analysis，and engineering experiments are widely employed to study the pressure bearing and deformation of the gangue side surrounding rock and support body. According to on-site investigations on the test section，the load formed on the gangue side support during the process of gangue collapse can be divided into dynamic load caused by the initial gangue collapse，analogous static load caused by slow compaction of gangue in the middle stage during the formation of roadway，and quasi static load originating from the stability in the later stage during the formation of roadway. A model was established to calculate the lateral pressure of the gangue side. The obtained results revealed that the lateral pressure of the gangue side increases from the roof to the floor. Then a correlation between the lateral pressure of the gangue side with the overlying rock pressure，internal friction angle of the gangue，gangue broken bulk coefficient，roof cutting height，and roof cutting angle was developed. A mechanical model was established to simulate interaction between the roof and floor of the roadway，the gangue side support，and the surrounding rock of the gangue side. The present study focuses on the influencing factors on the deformation of gangue side support and demonstrates that the lateral pressure on gangue side support was the internal cause of instability. Based on the obtained results，the construction of gangue side support was optimized and the linkage coupling support effect of single hydraulic prop and composite U-shaped steel was enhanced. The theoretical results were verified through on-site monitoring. The performance of the gangue side control demonstrated that the proposed optimized scheme effectively controls the surrounding rock deformation.
许旭辉1，何富连1，翟文立1，王德秋1，李晓斌2，宋佳宇1，张亚江1. 切顶留巷矸石帮围岩–支护体承压变形特征及控制技术[J]. 岩石力学与工程学报, 2024, 43(2): 439-453.
XU Xuhui1，HE Fulian1，ZHAI Wenli1，WANG Deqiu1，LI Xiaobin2，SONG Jiayu1，ZHANG Yajiang1. Pressure bearing and deformation of the surrounding rock-support body and control technology on the gangue side in gob side entry retaining #br#
by roof cutting. , 2024, 43(2): 439-453.
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2024, Vol. 43 
