东部高潜水位矿区离层注浆减沉可行性分析.

The environmental geological problems such as ground subsidence are serious in Panxie mining area due to repeated mining of multiple coal seams. It is beneficial to release coal resources and reduce the harm of ground subsidence to study the technology of reducing subsidence by separated layer grouting, which is of great significance to the green and low-carbon development of high-diving mining area. 8 pairs of production mines in Panxie mining area were taken as the research object, and the selection principle of grouting face under special conditions was established according to the conditions of coal mine hydrogeology, mining technology and excavation engineering. Using 3DEC software, the grouting effect of 13-1 coal in 1616(3) face was predicted under the conditions of no grouting and different injection-production ratio after mining. Finally, the feasibility of reducing subsidence by separated layer grouting in Huainan mining area under special conditions was analyzed. The results show these as follow. The selection results of 110 working faces in the study area show that 6 working faces meet the grouting conditions, and the separated layer grouting technology is feasible in Panxie mining area. The results of model prediction show that the subsidence curve is symmetrical in the center, and the maximum value of surface subsidence is located in the middle of goaf. With the advance of the working face, the surface subsidence increases, and the position of the maximum value of the subsidence curve moves towards the advancing direction of the working face. ③When the injection-production ratio is more than 60%, the maximum surface settlement decreases from 2 000 mm to less than 400 mm, and more than 80%, indicating that grouting can effectively alleviate surface settlement. [ABSTRACT FROM AUTHOR]