Isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions

Abstract

The invention provides an isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions. The method comprises the following steps: according to the geological information of a mine and geographical position of a village, determining distance between the boundary line of a protective coal pillar at the cut side of a working face and a cut, determining sufficient mining distance in the direction of the working face, and comparing the distance with the sufficient mining distance so as to determine an isolated grouting-filling control area for the overburden rock; drilling a plurality of inlet wells in the control area towards a coal bed direction, wherein the final hole depth of the inlet wells is 15 to 40 times higher than the coal bed mining height above the coal bed; and when the coal face is mined to 10 to 30 m away from the inlet wells, injecting coal ash slurry in abscission zones in the rock strata above the coal face through the inlet wells until the grouting-filling control area is mined in the coal face, and completing grouting-filling coal-mining at the cut side. The method is applicable to mining of cut-side local pressed coal and can reduce loss of cut-side pressed coal and improve a mining rate; and compared with a full-working face isolated grouting-filling mining method for overburden rock, the method provided by the invention has the advantages of a small filling amount, low filling cost, good control effect on surface subsidence, and capacity of realizing coal mining without village migration under cut-side pressed-coal conditions.

Description

technical field [0001] The invention relates to a method for controlling subsidence in coal mine mining, in particular to a mining method suitable for local coal-pressing and overlying rock isolation grouting filling on the cutting eye side of a building under a building without moving the village. Background technique [0002] Most of the coal mines in my country have the problem of building coal pressing to varying degrees. The mining of coal pressing under buildings has always been a major problem that plagues coal mining enterprises in my country, especially the mining of coal pressing under villages. Solving the problem of coal mining under buildings is not only an economic issue, but also a social issue, involving coal mining and agricultural production, farmers' lives, industrial-peasant relations, and other issues of social stability. In recent years, in the coal mining industry, methods such as goaf filling mining (such as gangue filling, paste filling, high-water m...

AI Technical Summary

Problems solved by technology

For this kind of partial coal mining area on the cutting side, according to the technology disclosed in patent ZL201210164929.9, it is still necessary to implement overlying rock isolation grouting filling for the entire mining area. Obviously, the filling range and filling volume are more important than actual subsidence control and The demand for building protection is far too large, which increases the cost of filling

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