Abstract
Aiming at the problem of the safety mining problems of longwall paste filling working face under buildings on high confined water in the Daizhuang Coal Mine, the paste filling mining method was used. A series of theoretical analyses, numerical simulations, and field measurements were applied. The results showed that when the filling interval of the working face increases from 1.2 m to 3.6 m, no significant change is found in the depth of the perforated plastic zone of the floor strata. According to the types of water-conducting cracks in the floor strata of the working face 11607, the floor strata are divided into the floor intact area, the structure developed area, and the floor weak area. Based on that, the measures for preventing and controlling the floor failure in the paste filling working face are proposed. Furthermore, the failure depth of the floor of the test working face was detected by the on-site water injection method, and the results showed that the maximum failure depth of the floor of the test working face was about 3 m.
Highlights
Researchers in many countries have conducted a lot of theoretical research and practical applications on the prevention and treatment of coal mining under confined water by the backfill mining method [1–6]
The probability of fracture and water inrush of the underlying coal seam increases with the increase of coal mining depth
Daizhuang Coal Mine is located in Jining City, Shandong Province (Figure 1). It belongs to the conditions of coal mining under typical buildings and close-distance high-pressure water
Summary
Researchers in many countries have conducted a lot of theoretical research and practical applications on the prevention and treatment of coal mining under confined water by the backfill mining method [1–6]. Aiming at the safe mining of the No 16 coal seam in Daizhuang Coal Mine under buildings and high confined water conditions, the paste is used to fill the goaf area so that the filling body and the top and bottom of the goaf form a supporting system of the top plate-filling body-bottom plate. This technology can control the depth of the bottom plate damage and can play a better role in groundwater resources [27–30]. The use of mine solid waste as a filling material can greatly improve the ecological environment of the mining area
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