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Hard top coal weakening method based on combination of plasma blasting and liquid injection

A combination of plasma and technology, applied in drilling equipment and methods, chemical instruments and methods, earthwork drilling and mining, etc., can solve problems such as weakening, and achieve the effect of avoiding environmental pollution

Pending Publication Date: 2022-04-15
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

However, the water injection effect is closely related to the mineral composition in the top coal, not all top coal is suitable for water injection weakening

Method used

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  • Hard top coal weakening method based on combination of plasma blasting and liquid injection
  • Hard top coal weakening method based on combination of plasma blasting and liquid injection
  • Hard top coal weakening method based on combination of plasma blasting and liquid injection

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Embodiment Construction

[0031] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] A fully mechanized caving face has a length of 200m and a strike length of 950m. The thickness of the coal seam is 8m, the coal seam is a hard coal seam, and the uniaxial compressive strength is 21MPa. The working face adopts comprehensive mechanized top-coal caving mining method, the mining height is 3.8m, and the coal caving height is 4.2m. The top-coal cavitation of other adjacent working faces under similar conditions is poor, which seriously affects the recovery rate of the top-coal in the working face.

[0033] Such as figure 1 As shown, the hard top-coal weakening method based on the combination of plasma blasting and liquid injection in this embodiment is...

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Abstract

The invention discloses a hard top coal weakening method based on combination of plasma blasting and liquid injection, which comprises the following steps: firstly, tunneling a process roadway in top coal in the middle of a working face, constructing a plurality of drill holes in top coal areas on two sides of the process roadway, and performing blasting operation by adopting a plasma blasting method; then the plasma blasting equipment is withdrawn, a liquid injection pipeline is installed, and a polyurethane hole sealing material is adopted for hole sealing; injecting a mixed solution of tetrasodium iminodisuccinate IDS and sodium dodecyl sulfate SDS through a liquid injection pipeline to further weaken the top coal; and finally, the steps are repeated, blasting and liquid injection weakening of all the drill holes in the two sides of the process roadway are completed, working face top coal fracture development and strength reduction are achieved, and the top coal caving rate during working face stoping is increased. On the basis of plasma blasting, the modified solution is adopted for further weakening the top coal, the top coal caving condition can be improved, the air permeability of the top coal is improved, and powerful conditions are provided for gas extraction.

Description

technical field [0001] The invention relates to the technical field of mine safety production, in particular to a method for weakening hard top coal based on the combination of plasma blasting and liquid injection. Background technique [0002] Top-coal caving technology is an important technology to solve the problem of thick coal seam and extra-thick coal seam mining. Top-coal caving mining can realize full thickness mining at one time, so as to reduce material consumption, improve coal recovery rate, effectively solve the problem of spontaneous combustion, and achieve high production and high efficiency Effect. However, there are still many problems in the mining of top-coal caving. For example, it is a long-term research topic to improve the caving performance of top-coal in the mining of top-coal caving in hard and thick coal seams. When mining hard top coal, due to the high strength of the coal body, the top coal can hardly be broken or broken only by mine pressure, s...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21F7/00E21B7/00E21B33/13C09K8/60C09K8/68
Inventor 朱志洁管松松荣海陈蓥韩军宋卫华霍丙杰
Owner LIAONING TECHNICAL UNIVERSITY
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