Overburden separation bed grouting subsidence reducing process in coal mine strip mining

Abstract

The invention relates to an overburden separation bed grouting subsidence reducing process in coal mine strip mining. The process comprises the following steps of a, dividing coal mine strips; b, obtaining the separation distance and the number of coal pillars of each coal mine strip, and maintaining the positions of the coal pillars of each coal mine strip constancy so as to maintain the separation bed generating positions in the coal mine producing process constancy; c, detecting the positions of separation beds generated above the coal mine by the coal mine strip in the mining process to avoid the separation bed closing; d, drilling holes above the separation beds, and performing grouting operation until the separation beds are completely filled by grouting; e, continuously drilling holes until the holes are communicated with the separation beds of the next coal mine strip, and performing grouting operation on the ground toward the separation beds through the holes until the separation beds are completely filled by grouting; and f, repeating the step e until the production of the coal mine is completed. A strip mining method is combined with a separation bed grouting subsidence reducing technology is combined; the resource waste due to single strip mining can be reduced; the mining rate is improved; and meanwhile, the grouting subsidence reducing effect of the single overburden separation bed is improved.

Description

technical field [0001] The invention relates to the field of subsidence reduction in mining areas, in particular to a technology for grouting subsidence reduction in overlying rock separation layers in strip mining of coal mines. Background technique [0002] Coal pressing under buildings is one of the major technical problems plaguing my country's coal mines, especially in eastern mining areas. Taking Huaibei Mining Group in the East China mining area as an example, there are more than 300 coal pressing villages, and the coal pressing in villages accounts for the total reserves. 47% of mines, and up to 80% in some mines, and the annual relocation cost is as high as 800-100 million yuan. In recent years, the development of filling coal mining technology has alleviated this problem to a certain extent, and various goaf filling mining technologies such as solid, paste, and high-water materials have been formed. [0003] However, the subsidence reduction effect of simple layer-...

AI Technical Summary

Problems solved by technology

[0003] However, the subsidence reduction effect of simple layer-separated grouting technology is limited, and the subsidence reduction effect is not enough to control the impact and damage of coal seam mining on the surface.