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Experimental study on the influence of sandstone gradation on the water storage capacity of a pore-space reservoir in a waste dump of an open-pit coal mine
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Experimental study on the influence of sandstone gradation on the water storage capacity of a pore-space reservoir in a waste dump of an open-pit coal mine
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Journal Article
Experimental study on the influence of sandstone gradation on the water storage capacity of a pore-space reservoir in a waste dump of an open-pit coal mine
2023
Overview
Poor water management can result in water shortages that greatly impact the production capacity of open-pit coal mines in arid and semiarid areas. Additionally, the improper handling of mine pit wastewater can exacerbate the overall loss of water resources. To mitigate the imbalance between the seasonal supply and demand for water resources, and the scarcity and low utilization rate of the water resources associated with open-pit coal mines, underground reservoirs with rock-mass pore space can be established in on-site waste dumps to store water. Here, the Baorixile open-pit coal mine, located in a semiarid area of China, was selected as the research area. Pebbly sandstone material was divided into three grain sizes in order to study these pore-space reservoirs. Considering the water storage characteristics of the aquifers in their original undisturbed state, and with reference to similarity theory, a similarity simulation experiment was set up. The experimental design can facilitate simulation of the influence of overburden pressure on the water storage capacity of underground pore-space reservoirs constructed in different stages, repeated pumping/storage on the reservoir water storage capacity, and underground reservoir establishment on ground surface settlement. It was found that pebbly sandstone with a larger grain size is more suitable for use as a water storage material in underground pore-space reservoirs of open-pit coal mines. This study provides a reliable material grading system for underground reservoir construction in open-pit coal mine waste dumps in arid and semiarid areas, to improve the water resources situation in mining areas.
