Fast prediction method for crossdrift and pitshaft coal uncovering burst fatalness

Abstract

The invention discloses a quick prediction method of protrusion danger in the crossdrift and pitshaft coal uncovering, implements quick gas pressure measurement of a coal bed in front of a working face of a crossdrift or a pitshaft by rock strata grouting and rock strata densification, and collects a complete coal core of the coal bed with a coring device, thus determining the position of a soft bed and obtaining a coal sample in the soft bed, and after the collecting of the complete coal core is finished, a thermometer is sent into the coal bed through a coring pore and taken out after occluded for half an hour, the temperature of the coal bed is read, an initially released gas dilatation energy index Wp of the collected coal sample in the soft bed of the coal core is measured, and whether the protrusion is generated when uncovering the coal bed of the crossdrift or the pitshaft and protrusion intensity are determined by comparing the measured initially released gas dilatation energyindex Wp with existing critical values of weak protrusion and strong protrusion. The quick prediction method of the protrusion danger in the crossdrift and pitshaft coal uncovering has short prediction time, can finish in about 3 to 5 days, and has accurate prediction, convenient operation, good effects and wide practicability.

Description

technical field [0001] The invention relates to a coal mine disaster prediction technology, in particular to a method for quickly predicting the outburst risk of coal seams before coal excavation in Shimen and shafts. Background technique [0002] As we all know, the comprehensive index method is the commonly used outburst prediction method in the process of underground coal excavation and wellbore. Article 32 of the "Detailed Rules for Prevention and Control of Coal and Gas Outburst" stipulates that: before the outburst coal seam is uncovered in Shimen, the comprehensive index method, drilling gas desorption index method or other methods proven to be effective by tests should be used to predict the risk of outburst of the working face. However, in actual use, the comprehensive index method is mainly used for coal excavation in Shimen and wellbore. [0003] Coal and gas outburst is a dynamic phenomenon that occurs in gas-containing soft coal. The acting forces are in-situ s...

AI Technical Summary

Problems solved by technology

) The disadvantages of this method are: the pressure measurement takes a long time, generally more than 7 to 10 days, which seriously delays the construction period; taking a coal sample every 1m may miss the soft layered coal sample; the used predictive index Accuracy of outstanding predictions cannot be given without rigorous scientific verification

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