Surrounding rock structural characteristics and anchor-cable strengthened support technology of the gob-side entry retaining with roof cutting and pressure releasing
WANG Fangtian1，2，SHANG Junjian1，2，ZHAO Bin3，CAO Qinghua4
(1. School of Mines，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；2. State Key Laboratory of Coal Resources and Mine Safety，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；3. Department for Foreign Cooperation and Development，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；
4. Juji Coal Mine of Henan Longyu Energy Co.，Ltd.，Yongcheng，Henan 476600，China)
Abstract：In order to solve the serious deformation and difficult support problems for the gob-side entry retaining in the working face front section，taking the transport entry in LW2901 working face of Juji coal mine as the field project，the surrounding rock stability control of the gob-side entry retaining in the front section of the working face by anchor-cable strengthened technology was investigated through theoretical analysis，numerical simulation and field measurement. By establishing the mechanical structure models for the gob-side entry retaining roof with the consideration of roof cutting or not，the equations of the support strength and the subsidence of the roof were derived. The results show that，compared to the roof without cutting，the subsidence and the support strength of the cutting roof reduce 46.4% and 40.4% respectively，which proves that gob-side entry retaining is an effective entry surrounding rock control way. The surrounding rock damage characteristics under different strengthened support schemes were simulated by the software of FLAC3D，and the reasonable design scheme was determined as “4– 3–3–3–4”cyclic arrangement of reinforcing anchor cables along the direction of the entry. With increasing the number of the strengthened anchors，the stress and deformation of the surrounding rock gradually decrease and the decrease rate shows a decreasing trend. The in-site monitoring results show that the maximum values of the roof subsidence，the floor heaving and the coal wall deformation are 451 mm，550 mm and 507 mm，respectively. The successful practice of the anchor-cable strengthened support technology of the gob-side entry retaining with roof cutting and pressure releasing in the front section of the working face provides a useful reference for the surrounding rock control under similar conditions.
王方田1，2，尚俊剑1，2，赵 宾3，曹庆华4. 切顶卸压沿空留巷围岩结构特征及锚索强化支护技术[J]. 岩石力学与工程学报, 2021, 40(11): 2296-2305.
WANG Fangtian1，2，SHANG Junjian1，2，ZHAO Bin3，CAO Qinghua4. Surrounding rock structural characteristics and anchor-cable strengthened support technology of the gob-side entry retaining with roof cutting and pressure releasing. , 2021, 40(11): 2296-2305.
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2021, Vol. 40 
