Control method for coal impact disasters in coal mining

A technology for coal mass and disasters, which is applied in mining equipment, mining equipment, earth-moving drilling, etc., can solve the problems of insufficient prevention and control methods, single pressure relief measures, and insufficient effect, so as to eliminate coal mass slippage, instability or other problems. The effect of crushing impact

Inactive Publication Date: 2016-03-23
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The traditional methods to prevent coal impact mainly include large-diameter coal drilling for pressure relief, water injection for coal body pressure relief, coal pressure relief blasting, and pre-pressure relief for hard roof blasting. The

Method used

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  • Control method for coal impact disasters in coal mining
  • Control method for coal impact disasters in coal mining
  • Control method for coal impact disasters in coal mining

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Experimental program
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Effect test

Embodiment Construction

[0020] The present invention will be further described below.

[0021] Such as Figure 1 to Figure 4 Shown, concrete steps of the present invention are:

[0022] A. Determining the coefficient of frictional resistance: collect the coal body sample 8 and the top and bottom slate sample 9 from the mining site of the mine, and determine the friction coefficient of the coal body sample 8 and the top and bottom slate sample 9 through laboratory stick-slip experiments and proportional calculations; specifically The coal rock sample is combined with the roof-bottom-coal seam to carry out the shear slip experiment in the laboratory. An axial force N is set, and a horizontal force F is applied to the coal sample 8 until the coal sample 8 slips. According to Shear stress and vertical stress calculate frictional resistance coefficient:

[0023] μ=F / N

[0024] B. Determine the relevant parameters for on-site implementation: before the underground mining of the coal mine, drill holes 12...

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Abstract

The invention discloses a control method for coal impact disasters in coal mining. The method includes the specific steps of A, determining the friction resistance coefficient, wherein the friction coefficient of a coal sample and a top and bottom plate rock sample is determined through the laboratory attaching and sliding experiments and ratio calculation; B, determining the field implementation related parameter, wherein the drilling size, depth and the amount of water required to be injected and fine-grained coal rock powder or the amount of other lubricating materials are determined, and therefore the friction coefficient mu detected in a laboratory is decreased; C, conducting field implementation, wherein implementation is conducted in two tunnels before coal recovery according to the experiments and calculation conditions; D, conducting effect tests, wherein the slide increasing effect is determined, and related parameters for implementing slide increasing means again are determined according to the monitor effect. When pressure is exerted on top and bottom plates, coal can be made to slide relative to the top and bottom plate rock layers, the elastic performance accumulation in the coal is reduced, and therefore the probability that coal slides to lose stability or is broken and smashed is effectively lowered or eliminated.

Description

technical field [0001] The invention relates to a method for preventing and controlling coal body impact disasters in coal mining, and belongs to the technical field of preventing and controlling rock bursts. Background technique [0002] The coal industry is the basic industry of our country, and its healthy, stable and sustainable development is a major issue related to the national energy security. Under the coal mine, the roof and floor strata have a huge mutual extrusion effect on the coal seam, especially the oblique force generated by the long-arm beam and masonry beam on the recovered coal body and the impact of the broken roof in the upper section goaf on the section coal pillar. If the friction coefficient between the coal and rock layers is large, the relative sliding of the coal seam will be blocked, and a large amount of elastic energy will be accumulated in the coal seam. When the thrust in the horizontal direction is greater than the frictional resistance or ...

Claims

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Application Information

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IPC IPC(8): E21F17/00
CPCE21F17/00
Inventor 陆菜平刘洋王洪宇刘鹏飞温思浩
Owner CHINA UNIV OF MINING & TECH
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