Ground stress coal and gas outburst hazard multi-information coupling prediction method
A technology of gas outburst and multi-information, applied in earth cube drilling, mining equipment, mining equipment, etc., can solve problems such as inability to fully reflect the danger of coal and gas outburst, failure to achieve coupling prediction, and obstacles to coal mine safety production, and achieve prediction The process is simple and convenient, the accuracy is high, and the effect of overcoming the incomplete information of single-index complement set
Active Publication Date: 2011-09-14
CHINA UNIV OF MINING & TECH
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Problems solved by technology
Due to the complex geological conditions of coal mines, these indicators cannot fully reflect the risk of coal and gas outburst, and these indicators have not realized the coupling prediction in the true sense
Therefore, the danger of coal and gas outburst cannot be accurately predicted, and low-indicator coal and gas outburst accidents often occur, which poses a huge obstacle to the safe production of coal mines
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[0013] As shown in Figure 1, in the multi-information coupling prediction method of in-situ stress briquette and gas outburst risk of the present invention, first adopt hydraulic fracturing method, stress relief method (such as hollow bract) or other methods that can test in-situ stress to test the roadway Maximum concentrated in-situ stress σ in coal body 2 in front of mining face 1 max ; At the same time, coal samples were taken in the coal body 2, and the triaxial compression test was carried out to test the critical compressive strength of the coal sample, which is the embodiment of the mechanical properties of the coal body; construction from the roadway mining face 1 to the front coal body 2 For the borehole 6 with a length not less than 10m, measure the value of all cuttings in the 1m section or test other indicators that can reflect the change of in-situ stress for every 1m drilled, and record the cuttings value S in the 1m section respectively 1 , 2m segment cuttings ...
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The invention relates to a ground stress coal and gas outburst hazard multi-information coupling prediction method. By testing original rock ground stress, coal mechanical strength and a drilling index value in the extraction process and carrying out coupling prediction of coal and gas outburst hazards on test results, a ground stress coal and gas outburst hazard multi-information coupling prediction model is established, thus, the coal and gas outburst hazard information can be fully acquired, the defect of single-index acquisition information insufficiency can be overcome and the coal and gas outburst hazard prediction accuracy can be improved.
Description
technical field [0001] The invention relates to a method for predicting the risk of gas outburst, in particular to a multi-information coupling prediction method for in-situ stress briquette and gas outburst risk which is suitable for coal mine mining face. Background technique [0002] Coal and gas outburst disasters are one of the main disasters that cause mass deaths and injuries in mines. Accurate prediction of coal and gas outburst hazard performance can effectively prevent accidents from happening. However, the current coal and gas outburst risk prediction methods are mainly single-index methods, such as using the value of cuttings S, the desorption index K 1 value, Δh 2 , the initial velocity q value of drilling gas gushing out, etc., or summarize these indicators into empirical formulas for prediction. Due to the complex geological conditions of coal mines, these indicators cannot fully reflect the risk of coal and gas outburst, and these indicators have not realiz...
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IPC IPC(8): E21F17/18
Inventor 林柏泉杨威翟成
Owner CHINA UNIV OF MINING & TECH