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

A fully-mechanized mining face and retraction channel technology, which is applied to the determination field of bolt and cable support for the retracted channel of fully-mechanized mining face, can solve problems such as difficult accurate estimation, factors affecting the determination of bolt support, and lack of

Active Publication Date: 2020-02-21
XIAN UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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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 influen

Method used

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

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Embodiment Construction

[0121] In the method for determining the bolt and cable support of the withdrawal channel of the fully mechanized mining face in this embodiment, the fully mechanized mining face is Ningtiaota Coal Mine 1 -2 Fully mechanized coal mining face.

[0122] The safety factors mentioned below are the preset parameter values ​​in order to prevent the consequences caused by factors such as material defects, working deviation, and sudden increase of external force during civil and mechanical engineering design. The force that engineering mechanics can bear in theory must be Greater than the force it actually bears, the safety factor is the ratio of the ultimate stress to the allowable stress.

[0123] According to the drill hole data and the underground measured data, the thickness of the coal seam within the excavation range of the N1114 working face is 0.6-1.92m, the average thickness is 1.75m, the dip angle of the coal seam is 0°41'-1°55', and the local undulation; the buried depth o...

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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 ...

Claims

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Application Information

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IPC IPC(8): E21D20/00E21D21/00E21F17/00E21F17/18G06Q50/02
CPCE21D20/00E21D21/0026E21F17/00E21F17/18G06Q50/02
Inventor 李金华陈文晓赵松巍
Owner XIAN UNIV OF SCI & TECH
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