Abstract
Deep coal seam mining often leads to water resource loss due to bedrock water entering the workings of the mine and is discharged adjacent to the mining area. Using the geological conditions of the Maiduoshan coal mine, this paper applied a physical simulation experiment. The specified rock above the coal seam was hydraulically fractured in advance to form a postmining grouted fracture network, followed by grouting to construct a flexible isolation layer that blocked the infiltration of groundwater from the aquifer into the water-conducting fracture zone. Stress sensors, flow sensors and strata displacement monitoring technology were deployed inside the experimental material to study the spatial distribution characteristics and evolution law of the water-conducting fracture zone in the overlying rocks. Analysis of the water-conducting fracture zone development law, stress variation, overburden evolution characteristics, fracturing and grouting sequence of the flexible isolation layer and the effect of postmining grouting on the water barrier was conducted. These experiments verified the feasibility of fracture and grouting of the flexible isolation layer. These research results will provide practical guidance for the transition from the current safe and efficient mining methods to safe and green mining methods of deep coal mining in the western mining areas of China.
Highlights
Deep coal seam mining often leads to water resource loss due to bedrock water entering the workings of the mine and is discharged adjacent to the mining area
Deep coal mining in western mining regions require the protection of water resources and surface ecology, while ensuring safe and efficient mining operations[13]
With the increasing distance of coal seam mining, the roof developed significant subsidence, and the influence range of the bedrock boundary caused by the mining was still in the isolation layer fracturing zone
Summary
Deep coal seam mining often leads to water resource loss due to bedrock water entering the workings of the mine and is discharged adjacent to the mining area. Deep mining disrupts the overburden structure and causes bedrock water to enter the workings of the mine along with water-conducting fractures, resulting in discharge and loss of water resources These processes destroy the groundwater circulation system affecting the surface e cology[9,10]. By constructing a flexible isolation layer, the mining failure zone can be transformed, the influence range of mining fissures can be controlled, and the water environment conditions that satisfy the natural circulation of groundwater and surface ecology will be maintained or rebuilt. Using this method, the groundwater and surface ecology after mining can be maintained or even improved over the original state. This method is direct and convenient and can provide a new and effective method for the protection of shallow water resources in coal seam mining
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