Rock cross-cut coal uncovering high-pressure air fracturing anti-reflection and outburst prevention effect evaluation method

Abstract

The invention provides a cross-cut coal uncovering high-pressure air fracturing anti-reflection and outburst prevention effect evaluation method which comprises the following steps: calculating a first influence parameter according to a gas flow attenuation coefficient; calculating a second influence parameter according to the initial drilling gas extraction concentration and the actual drilling gas extraction concentration; calculating a theoretical fracturing influence radius according to the fracturing drilling radius and the carbon dioxide release pressure, and calculating a third influence parameter according to the theoretical fracturing influence radius and the actual fracturing influence radius; fourth influence parameters are calculated according to the preset number of drill holes and the actual number of drill holes; and calculating a weight coefficient of each influence parameter by adopting an optimal order method, and calculating an evaluation result according to the weight coefficients and the influence parameters. According to the rock cross-cut coal uncovering high-pressure air fracturing anti-reflection and outburst prevention effect evaluation method, the evaluation difficulty of the high-pressure air fracturing anti-reflection and outburst prevention effect can be reduced, and the accuracy of the evaluation result is improved.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for evaluating the effect of high-pressure air cracking, anti-penetration and anti-outburst in Shimenjie coal. Background technique [0002] Coal and gas outburst is a special gas gushing phenomenon. Under the action of pressure, the broken coal and gas are suddenly ejected from the inside of the coal body to the mining space in large quantities, thus seriously affecting the production safety inside the coal mine. [0003] In recent years, my country has formed a "four-in-one" comprehensive prevention and control system in the prevention and control of coal and gas outbursts. Various means such as cracking and anti-reflection are used to improve the safety factor inside the mine. Among them, the high-pressure air blasting cracking and anti-reflection technology mainly generates high-pressure gas and stress waves through the phase change of liquid carbon d...

AI Technical Summary

Problems solved by technology

[0004] However, after completing the anti-reflection and outburst treatment by high-pressure air fracturing, it is difficult for the staff to accurately evaluate the actual treatment effect

Existing evaluation methods are difficult to implement, and relevant evaluation parameters are difficult to obtain, and evaluation results cannot be obtained in a timely and accurate manner, which will seriously affect the safety of mine operations

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