Method for calculating working resistance of hydraulic support and method for selecting hydraulic support

Abstract

The invention provides a method for calculating the working resistance of a hydraulic support and a method for selecting the hydraulic support, and the method for calculating the working resistance of the hydraulic support comprises the following steps: if a high-stage top coal caving coal mining method is adopted to mine a steeply-inclined super-thick coal seam of 35-55 degrees or 80-90 degrees, the working resistance of the hydraulic support is calculated; if yes, the first hydraulic support load is calculated when the working face is normally propelled and the top protection coal is not broken yet, and the first hydraulic support load comprises the self weight of a coal body and the additional load applied by a top protection coal cantilever beam; calculating a second hydraulic support load when the working face cycle operation is stopped and top coal caving is started, wherein the second hydraulic support load comprises the self weight of the coal body and the impact load of the large coal body on the support; and comparing the first hydraulic support load with the second hydraulic support load, and taking the larger load as the working resistance of the hydraulic support. The method solves the problems that in the prior art, according to the general top coal caving support type selection theory, in the actual production process, the support is frequently crushed, toppled over, sideslipped, bitten and the like.

Description

technical field [0001] The invention relates to the field of coal, in particular to a method for calculating the working resistance of a hydraulic support and a method for selecting a hydraulic support. Background technique [0002] Most of the steeply inclined and extra-thick coal seams adopt the high-stage top-coal caving mining method, and the mining-caving ratio reaches 1:7, while the mining-caving ratio of the general top-coal caving process is only 1:3. In the high-stage top coal caving process, since the maximum coal caving height reaches 22m, there are some coal or rock masses with large lumps, which fall to the top of the hydraulic support through free fall motion, which will impose a large dynamic load on the hydraulic support. Impact, when the working resistance of some hydraulic supports is small or the coal and rock mass is large, it will cause the hydraulic support of the fully mechanized caving surface to be crushed, damaged, overturned, overturned and other a...

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Problems solved by technology

[0003] Based on the above problems, the present invention proposes a method for calculating the working resistance of the hydraulic support and a method for selecting the hydraulic support. Collapsing, toppling, sideslipping, biting, etc., and the recovery rate of the top coal is low, seriously affecting the normal operation and production of the working face, seriously reducing the work efficiency, resulting in high maintenance and labor costs, short support life, and increased unit costs. technical problem

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