Comparison of treatment schemes for coal mine subsidence areas and analysis of surface stability
In response to the difficulty in selecting effective solutions for the current treatment of coal mine subsidence areas,a coal mining subsidence area in a certain area of North China was taken as the research object.Based on previous exploration data,a three-di-mensional simulation analysis model was first established for this subsidence area.Based on this model,the FLAC3D numerical simula-tion analysis method was applied to determine that the subsidence problem in this subsidence area was mainly caused by cavities,and the risk was further increasing.Therefore,the filling method should be used for treatment.Secondly,based on the analytic hierarchy process(AHP),a treatment scheme for the collapsed area of the coal mine was constructed,and the main technical parameters in the filling treatment scheme were selected using the orthogonal experimental method.The reasonable combination of schemes was deter-mined as follows:filling the goaf with waste rock;during the filling process,two isolation walls were added and a 270-290 m mid sec-tion isolation board was installed.Finally,the technical solution was put into practice and the application effect was evaluated on site.The results showed that the economic and ecological benefits of the optimized coal mine collapse area treatment scheme were more prominent,proving that the scheme has certain practical significance.
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