Prediction and control of surface subsidence in solid filling mining
Li Xinwang 1, 2, Qu Zhengyi 1, Cheng Lichao 1, 2, Guo Xiangyu 1, Li Wengui 1
1. School of Mining Geomatics Engineering, Hebei University of Engineering, Handan 056038, China; 2. Coal Resources Development and Construcyion Application Technology Research Center of Universities in Hebei Province,
Hebei University of Engineering,Handan 056038, China
Abstract： In order to study the prediction and control of surface subsidence in solid backfill mining, based on the probability integral method and the elastic foundation theory, the prediction model of surface subsidence in solid backfill mining was established with Xingtai Mine as the background, and the theoretical solution of surface subsidence value was obtained. The numerical simulation and similar simulation were combined to simulate the initial filling rates of 80 %, 85 %, 90 % and 95 %, and the surface subsidence value and subsidence coefficient under different initial filling rates, as well as the migration law of grazing rock and surface subsidence basin in different advancing stages were studied and analyzed. The results show that the subsidence prediction model based on probability integration method and elastic foundation theory is feasible to predict the surface subsidence, which provides a theoretical basis for the surface subsidence control of solid backfill mining. Compared with caving method, the surface subsidence coefficient of solid filling mining is reduced by 93. 18 % ~ 93. 33 % on average, the initial filling rate is improved, and the under-topped amount of filling body is reduced, which can effectively control the surface subsidence. The migration law of working face rock and surface subsidence basin in different advancing stages is revealed, which provides a reference for the protection of surface structures.
