Method of verifying reasonable working resistance of working face hydraulic support

Abstract

A method of verifying reasonable working resistance of a working face hydraulic support includes the steps of measuring and calculating four resistance values p required by verification of working face support reasonable working resistance, and a sum of the values; measuring and calculating working face roof settlement delta hi; dividing working face roof control effects; determining a support reasonable working resistance alternative Ri; counting a ratio A1 of support end resistance ri during working face roof weighting, exceeding the values p and the sum; verifying working face support reasonable working resistance R. The method has the advantages that finished working face support reasonable working resistance and the efficiency of determining the support reasonable working resistance is greatly improved in terms of methodic systemization and parameter quantification.

Description

technical field [0001] The invention belongs to the field of roof control of longwall working faces in coal mining, and in particular relates to a checking method for reasonable working resistance of hydraulic supports on working faces. Background technique [0002] With the popularization of mechanized mining methods in the coal mining face, the extremely wide use of fully mechanized mining hydraulic supports has become inevitable. At present, 50,000 to 60,000 fully mechanized mining hydraulic supports are newly put into use in my country per year. The selection of support type and parameters before mining has become the core issue restricting the safe and efficient production of fully mechanized mining face, among which support working resistance (support strength) is the most basic and important parameter. Affected by mine pressure, the working resistance of the support is low, and the support is easily damaged in a large area or even crushed to death, which cannot guaran...

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Problems solved by technology

[0004] At present, the verification of the reasonable working resistance of the support in the mining face mainly depends on the fuzzy judgment of the use effect of the support on the production site and the appearance of mine pressure. If the roof sinking of the working face is small, it is considered that the working resistance of the support meets the requirements of roof control, etc. In the process of using this method, there is no criterion for judging the reasonable value of the working resistance of the support; However, this method lacks the standard of roof control effect; other studies based on the roof conditions of the mined working face and the law of the measured mine pressure, calculated the roof pressure according to the roof structure and compared it with the rated working resistance of the bracket, and qualitatively evaluated the rationality of the working resistance of the bracket. This method is difficult to popularize because it requires researchers to have relatively systematic expertise, and it also lacks the standard for the control effect of the roof of the working face.

In summary, there is no systematic method for evaluating the rationality of the working resistance of the supports in the mining face at home and abroad, so that the application of the analogy method is in the empirical stage, and there is no reasonable verification and setting method for the working resistance of the supports

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