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Abstract In order to prevent roof water from entering the working face, the height of water-conducting fracture zone needs to be estimated during coal seam mining under water body. In this paper, numerical simulation and theoretical analysis were used to study the development height of water-conducting fracture zone in the roof of a thick coal seam fully mechanized caving mining, and the safety feasibility of fully mechanized caving mining in this coal mine was discussed. According to the study, it was estimated that the height of water-conducting fracture zone was 168.1m. Numerical simulation showed that the plastic failure zone of the overlying strata reached to the water-bearing sand layer and even the surface after coal seam excavation. Therefore, the possibility of roof flood in fully mechanized caving mining was high.
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