Abstract
To study the evolution law of the discharge pathway for the old goaf water in the Datong mining area, a new fluid-solid coupling similar material was developed based on the fluid-solid coupling similarity theory. In the developed similar material, sand and barite powder were used as aggregate, polyurethane and white portland cement as binder, and water and silicone oil as regulator. The effects of different proportions on mechanical properties and water physical properties of materials were obtained through the experiments. The results show that the strength of the developed material is mainly controlled by cement and polyurethane, the hydrophilicity is affected by silicone oil, and the permeability coefficient is mainly affected by cement and polyurethane. For grouting agent, cement can realize the overall control function, and polyurethane can realize the local control in a certain range. As an ideal fluid-solid coupling similar simulation material, the developed material can simulate rock mass with different permeability and different strength. Besides, this material has been successfully applied to an experimental study on the mechanism of old goaf water discharge in an extra-thick coal seam in the Datong mining area, and the development and evolution characteristics of the old goaf water discharge pathway is obtained. This new kind of fluid-solid coupling similar material is developed based on the fluid-solid coupling similarity theory, which is suitable for revealing the evolution law of discharge pathway for the old golf water in the Datong mining area.
Highlights
As a large coal mining country, China has rich coal resources with a vast geographical distribution
Water inrush in the old goaf has the characteristics of large water volume, short time, and strong destructiveness
When the cement content is less than 6%, the tensile and compressive strengths of the material increase rapidly with the increase of polyurethane
Summary
As a large coal mining country, China has rich coal resources with a vast geographical distribution. Geofluids et al [14] used Vaseline and paraffin as the grouting agent and sand and talc as the aggregate and developed the fluidsolid coupling similar simulation material This material can be applied in a tunnel water inrush model test to simulate low and medium strength rock materials with different permeability. Sun et al [15] and Chen et al [16] used paraffin and Vaseline as the grouting agent, river sand and calcium carbonate as the aggregate, and hydraulic oil as the regulator, developed a new type of fluid-solid coupling similar material for the deep water-resisting layer. According to the fluid-solid coupling similarity theory, through the proportioning test, a new type of similar material for the fluidsolid coupling test is successfully developed and applied in the old goaf water discharge experiment in the Datong mining area
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