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Freezing Shimen Uncovering Coal Method Based on Hydraulic Slit

A technology of hydraulic slitting and coal removal in Shimen, which is applied in hydraulic mining, earthwork drilling, gas discharge, etc., can solve the problems of reduced coal strength in the area where coal is removed, limited diffusion radius of cement slurry, and inability to achieve regional reinforcement. Achieve the effect of reducing the number of gas drainage drilling holes, eliminating the risk of outburst, and reducing the risk of outburst

Active Publication Date: 2016-03-30
CHINA UNIV OF MINING & TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

These measures have achieved certain results in the work of uncovering coal and preventing outbursts in Shimen, but there are also great limitations. Measures such as hydraulic cutting can effectively relieve ground stress and gas pressure, but at the same time destroy the integrity of the coal body and expose The strength of the coal body in the coal area is reduced; grouting reinforcement can effectively improve the strength of the coal body, but the cement mortar can only permeate and diffuse in the cracks. Due to the small opening of the coal body cracks and the limited diffusion radius of the cement slurry, the coal can only be uncovered in a small range Regional coal strength, unable to achieve regional reinforcement

Method used

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  • Freezing Shimen Uncovering Coal Method Based on Hydraulic Slit
  • Freezing Shimen Uncovering Coal Method Based on Hydraulic Slit
  • Freezing Shimen Uncovering Coal Method Based on Hydraulic Slit

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Embodiment Construction

[0021] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0022] The method for uncovering coal in the freezing type stone gate based on hydraulic cutting of the present invention has the following steps:

[0023] a. At the position where the minimum normal distance between the working face 2 and the coal seam 1 of the rock roadway 3 is greater than or equal to 7m, pass through the protective rock pillar 4 and construct multiple water injection holes 5 at intervals in the direction of the coal seam 1, completely penetrating the target coal seam 1 , aperture 75 ~ 130mm;

[0024] b. Use the drill rig 19 to drive the through-hole drill pipe 20 with high-pressure seal to the set position of the slotted hole 5, start the drill rig 19 and the high-pressure water injection pump 8 at the same time, and pass the through-hole drill pipe with high-pressure seal in the drill hole 5 20 Cut the coal body around the borehole wi...

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Abstract

A freezing cross-cut coal cutting method based on hydraulic seam-cutting, comprising: constructing a plurality of water injection holes (5) on a coal cutting working surface (2) at a position where the minimum normal distance between the coal cutting working surface (2) and a coal layer (1) is greater than or equal to 7 m; employing a conventional hydraulic seam-cutting technique to perform hydraulic seam cutting on the water injection holes (5); after finishing the seam cutting, connecting the water injection holes (5) to a gas extraction pipe network and performing gas extraction; when the gas content of the coal layer is less than 8 m3 / t, stopping the extraction; respectively constructing a freezing hole (7) and a temperature measuring hole (6) at two sides of the water injection hole (5); employing a capsule hole sealer (12) to seal a hole; injecting water into the coal layer (1) via the water injection hole (5), and closing a valve after finishing water injection; the water injected into the coal layer gradually seeps into a microfissure of a coal body; and employing a conventional freezing technique to freeze the coal layer around the water injection hole (5), free water in a fissure of the coal layer being gradually converted from a liquid state to a solid state in the freezing process, thereby improving the strength and anti-impact capability of the coal body, solidifying the coal layer, and enabling cutting of the coal layer according to a conventional coal cutting method.

Description

technical field [0001] The invention relates to a gas extraction method, in particular to a hydraulic cutting-based frozen stone door coal removal method suitable for gas outburst in high-gas and low-permeability coal seams. technical background [0002] Coal and gas outburst is one of the main disasters that threaten the safety of coal mine production, especially when Shimen exposes the coal seam, the outburst is the strongest and most dangerous. The stress state of the coal and rock in front of the coal mining face is prone to sudden changes, and the elastic potential of the rock and coal seam and the gas energy are released in large quantities, resulting in high-intensity outbursts. The average strength of coal outburst in Shimen is more than 6 times that of other roadways, and more than 80% of oversized outbursts occur in the process of coal outburst in Shimen. Due to the particularity of the Shimen coal uncovering construction process, the whole process of exposing the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C45/00E21C41/18E21F7/00
CPCE21C45/00E21F7/00
Inventor 翟成林柏泉余旭彭深向贤伟徐吉钊倪冠华李全贵杨威许彦明汤宗情武世亮仲超
Owner CHINA UNIV OF MINING & TECH
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