Coal Engineering ›› 2025, Vol. 57 ›› Issue (8): 138-145.doi: 10. 11799/ ce202508019

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  • Received:2024-09-09 Revised:2025-01-10 Online:2025-08-11 Published:2025-09-11

Abstract:

Aiming at the problems of complex deformation and failure of surface in fully mechanized top coal caving mining of shallow buried extra-thick coal seam, and lack of measured research on surface subsidence law in Xialiyuan Mining area, the research methods that combined field measurements and theoretical analysis were used in 40201 working face, then the surface movement destruction forms and regional spatio-temporal characteristics were analyzed, and the surface subsidence rule under was summarized, moreover the prediction method of surface movement and deformation in shallow buried extra-thick coal seam mining was optimized. The results showed that the surface movement deformation was severe in the mining of shallow-buried extra-thick coal seam, and the surface subsidence basin was formed rapidly. And the subsidence basin could be divided into the dense area of step cracks in the middle of goaf, the tensile fracture area on both sides of the boundary, and the outer continuous deformation area, and along the advancing direction of the working face, the step fracture boundary would lag behind the working face by about 28m, while the pull fracture boundary would precede the working face by 5.7~18.4m. And the deformation was severe, the duration was short in the active period of surface movement, and the subsidence accounted for 89%~94% of the total subsidence. The zonal probability integral method could be used to predict the surface movement and deformation of shallow buried extra-thick coal seam, and this method had good applicability.

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