In order to make rational use of overburden water resources in deep buried, the law of overburden water movement during the mining of thick alluvium with deep buried thin bedrock was studied by means of similar simulation and numerical simulation. The results show that the change of overburden rock integrity and connectivity leads to the change of overburden water seepage channel; in the process of coal seam excavation, the plastic zone of thin bedrock is trapezoidal distribution, and the vertical fracture distribution is more and dispersed, which is the main channel for the rapid infiltration of the first aquifer water. The alluvial layer forms an arched separation fracture zone with good connectivity and wide, which is the main path of the second aquifer water infiltration. With the increase of mining distance, the development and expansion of plastic zone and bed separation fracture zone jointly affect the movement of overburden water, resulting in a rapid decrease of overburden water pressure and an increase of flow velocity and flow rate. After the formation of the fracture channel near the side of the working face, the seepage velocity is fast, and volume is large, which was prone to water inrush. The research conclutions provide a reference for studying the propagation law of overburden water in complex rock.
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