A method for alleviating stope pressure based on the principle of key layer reconstruction

A key layer and rock pressure technology, applied in ground mining, mining equipment, underground mining, etc., can solve the problems of frequent mine pressure accidents in the stope, achieve the effect of slowing down the degree of appearance, reasonable design, and strong operability

Active Publication Date: 2022-07-08
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] In order to solve the problem of frequent mine pressure accidents in the stope under the condition of no key layer stratum, the patent proposes a method for slowing down the mine pressure in the stope by rebuilding the key layer in view of the stratum condition where the key layer cannot be formed in the upper rock layer of the coal seam

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  • A method for alleviating stope pressure based on the principle of key layer reconstruction
  • A method for alleviating stope pressure based on the principle of key layer reconstruction
  • A method for alleviating stope pressure based on the principle of key layer reconstruction

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Embodiment 1

[0122] The first step on-site research and laboratory experiments

[0123] like Figure 4 As shown in the on-site investigation, the 1101 working face of a mine in the west is mainly mining 3# coal seam, with an average thickness of 4m, the overlying rock layer is a soft rock layer with a thickness of 35m, the size of the working face is 150m×100m, and the fracture angle of the rock layer is 10°; The rock formation rotation angle θ is taken as 20°; the fracture length a of the key layer to be reconstructed is taken as 14m; the grouting loss coefficient λ is taken as 1.1; the slurry filling rate ε is taken as 0.75; the slurry solidification rate m is taken as 0.85; , take 1500m 3 / h; Influence coefficient Δ of grouting pipe diameter, take 1.2 to 1.5.

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Abstract

The invention discloses a method for alleviating the mine pressure of stope based on the principle of key layer reconstruction. First, the geometric dimensions of the key layers to be reconstructed are determined through theoretical calculations, including four parameters, including dip length, strike length, thickness, and distance from the mined coal seam, fully considering the differences in coal seam thickness and lithology; the quantitative mutual feedback between strength and thickness of key layers is established. From the perspective of ensuring that the key layer does not slip and become unstable, a method for determining the strength and thickness of the key layer is proposed, and the quantitative design of the key layer reconstruction scheme is realized. Secondly, the key layer reconstruction site plan is determined, the cross-step bottom reverse grouting plan is proposed, and parameters such as drilling arrangement, drilling diameter, grouting material, grouting time and other parameters are designed. The design is reasonable and operable Finally, determine the key layer reconstruction construction process, including grouting time, procedures, labor organization, etc.

Description

technical field [0001] The invention relates to the field of mine pressure and rock formation control, in particular to a method for reducing stope mine pressure based on the principle of key layer reconstruction. Background technique [0002] Coal mining is the activity of mining and transporting coal in a certain depth below the surface. The coal seam is covered with layered rock layers of tens of meters or even nearly a thousand meters. The lithology, thickness, strength and chemical composition of the layered strata all show great differences. According to the theory of mine pressure and rock formation control in mining disciplines, it can be known that the distribution characteristics of rock formations and their breaking laws are important factors affecting the safety of coal mining, and there are two situations as follows: [0003] (1) When there is one to several layers of hard rock layers with large thickness and high strength in the upper layer of the coal seam, a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21D11/10G06F17/10
CPCE21C41/18E21D11/10G06F17/10
Inventor 张广超陶广哲李友左昊
Owner SHANDONG UNIV OF SCI & TECH
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