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Method for preventing and controlling coalbed rockburst through chemical reaction

A technology of rockburst and chemical reaction, applied in surface mining, earthwork drilling, underground mining, etc., can solve the problems of insufficient reduction of coal elastic energy, time-consuming processing of squibs, slow water absorption, etc., so as to avoid the absorption speed. Slow, convenient construction, good effect

Inactive Publication Date: 2015-07-15
HENAN POLYTECHNIC UNIV
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Problems solved by technology

In the mining face and roadway prevention and control of rock burst, coal seam water injection and pressure relief blasting are more commonly used. The limitations of the former are mainly due to the slow water absorption speed of the coal seam, and the insufficient reduction of the elastic energy of the coal body; the latter is easy to induce rock burst. And coal and gas are prominent, and squib disposal is time-consuming and dangerous

Method used

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Embodiment Construction

[0020] The method for preventing and controlling coal seam rockburst by chemical reaction of the present invention comprises the following steps successively:

[0021] (1) Select coal seams with rockburst hazards and vitrinite reflectance <0.6%;

[0022] (2) Select a certain area in the coal seam to drill holes. The number, depth and direction of the drilling holes meet the requirements of uniform hole distribution; Tendency coal seam.

[0023] (3) Seal the opening of the drilled hole;

[0024] (4), the configuration of alkaline solution, the [OH in the alkaline solution - ]>1 mol / L;

[0025] (5) Pump the configured alkali solution into the borehole, soak for more than 6 hours, increase the concentration of the alkali solution and soak time as the coal rank increases; during the soaking process, the alkali solution contacts the low-rank coal seam, That is, a chemical reaction occurs, and the mechanical strength of the coal seam decreases sharply, showing plasticity and los...

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Abstract

The invention discloses a method for preventing and controlling coalbed rockburst through chemical reaction, which sequentially comprises the following steps: selecting a coalbed with rockburst disasters and a vitrinite reflectance of less than 0.6%; selecting a certain area in the coalbed to carry out hole drilling; blocking orifices of drilled holes; preparing an alkali solution; pumping the prepared alkali solution into the drilled holes to soak for a period of time; and monitoring in a slight shock, electromagnetic radiation or cuttings drilling mode so as to ensure that the outburst-proneness is eliminated, repeatedly carrying out soaking many times until the outburst-proneness is completely eliminated. Compared with the traditional physical rockburst prevention and control measures, and the traditional rockburst prevention and control measures, the method disclosed by the invention is not only good in rockburst prevention and control effect, but also convenient to construct, high in safety and low in cost, eliminates the outburst-proneness rapidly and thoroughly, avoids the defect that the traditional water injection and absorption speeds are slow, provides a new prevention and control method for low-rank coalbed rockburst, and has a broad application prospect in low-rank coalbeds.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety production, and in particular relates to a chemical reaction method for preventing and controlling rock burst in coal seams. Background technique [0002] With the increase of mining depth, due to the joint effect of ground stress, mining stress and structural stress, most mines are threatened by rock burst to varying degrees. The appearance of ground pressure will become more and more serious, and the appearance of rock burst will become more and more frequent. The impact intensity and damage are increasing, especially when the mining depth reaches 500 m below the surface, it occurs frequently and intensely. [0003] Rockbursts seriously threaten the safe production of coal mines, and can cause serious deformation and damage to the mining space, personnel death, equipment damage, and displacement; when the gas-containing coal seam impacts, it will also cause a large amount of gas to gus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16
Inventor 郭红玉苏现波夏大平马俊强张双斌刘晓宋金星蔺海晓
Owner HENAN POLYTECHNIC UNIV
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