Comprehensive mechanized coal mining face withdraw channel anchor rod and anchor cable supporting determining method

Abstract

The invention discloses a comprehensive mechanized coal mining face withdraw channel anchor rod and anchor cable supporting determining method. The method comprises the following steps that firstly, the radius of a top plate breaking zone and the radius of a plastic zone are calculated; secondly, parameters of top plate anchor rods are calculated, wherein the parameters of the top plate anchor rods include the length of the top plate anchor rods, the row distance between the top plate anchor rods and the prestress of top plate anchor ropes; and fourthly, parameters of side anchor rods are calculated, wherein the parameters of the side anchor rods include the length of the side anchor rods, the row distance between the side anchor rods and the prestress of the side anchor rods. By means ofthe determining method, it can be ensured that a working face support in coal mine production can be withdrawn in a safe state; and furthermore, the production cost of a coal mine can be reduced, theproduction efficiency can be improved, and theoretical reference is provided for the design and study of coal mine withdraw road supports in future.

Description

technical field [0001] The invention belongs to the technical field of mine mining, and in particular relates to a method for determining bolt and cable support for a retraction channel of a fully mechanized mining face. Background technique [0002] The withdrawal process of fully mechanized mining face equipment directly affects coal mine production efficiency, and safety, efficiency and economy are three important indicators. The stability of the surrounding rock of the withdrawal channel is the premise to ensure the safety and rapid withdrawal of the equipment, which is directly related to the production efficiency and economic benefits of the coal mine. Coal mining enterprises and industry experts attach great importance to such issues. [0003] After years of experience and theoretical research, a lot of support concepts for retraction roadways have been produced, and the support forms have been continuously improved. Under the influence of excavation and mining, the ...

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Problems solved by technology

Due to the lack of information to determine the effective thickness of composite beam theory, the determination factors of bolt support are affected; in addition, composite beam theory does not consider the effect of horizontal stress on composite beam strength, stability and bolt load

In the reinforcement arch theory commonly used in weak coal seams, there are many influencing factors to determine the thickness of the reinforcement arch, which is difficult to estimate accurately; and the reinforcement arch theory is not only related to the strength of the reinforcement arch when the thickness of the reinforcement arch is much smaller than the span of the roadway. Depends on insufficient consideration of the stability of the reinforced arch

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