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A Determination Method for Bolt and Cable Support of Retraction Passage in Fully Mechanized Mining Face

A fully-mechanized mining face and retraction channel technology, which is applied to the determination field of bolt and cable support of the fully-mechanized mining face retraction channel, can solve the effect and influence of composite beam strength, stability and bolt load. Determining factors and many influencing factors of bolt support

Active Publication Date: 2020-11-20
XIAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A Determination Method for Bolt and Cable Support of Retraction Passage in Fully Mechanized Mining Face
  • A Determination Method for Bolt and Cable Support of Retraction Passage in Fully Mechanized Mining Face
  • A Determination Method for Bolt and Cable Support of Retraction Passage in Fully Mechanized Mining Face

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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 method for determining the anchor bolt and cable support of a retraction channel of a fully mechanized mining face, comprising the following steps: step 1, calculating the radius of the roof rupture zone and the radius of the plastic zone; step 2, calculating the parameters of the roof bolt, The parameters of the roof anchor rod include the length of the roof anchor rod, the row spacing between the roof anchor rods and the prestress of the roof anchor rod; step 3, calculate the parameters of the roof anchor cable, and the parameters of the roof anchor cable include the length of the roof anchor cable, the roof anchor rod and the roof anchor rod. The row spacing between the anchor cables and the prestressing of the roof anchor cables; step 4, calculating the parameters of the anchor bolts, the parameters of the anchor bolts include the length of the anchor bolts, the row spacing between the anchor bolts and the anchor bolts prestressed. The determination method of the invention can not only ensure that the working face support is withdrawn in a safe state during the production of the coal mine, but also can reduce the production cost of the coal mine, improve the production efficiency, and provide a theoretical reference for the support design and support research of the coal mine retraction roadway in the 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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Patent Type & Authority Patents(China)
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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