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 energy index 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 rapidly predicting the outburst danger of a coal seam before unearthing coal in a stone gate and a shaft. Background technique [0002] As we all know, the comprehensive index method is the outburst prediction method commonly used in the process of unearthing coal in Shimen and shaft shafts. Article 32 of the "Detailed Rules for the Prevention and Control of Coal and Gas Outbursts" stipulates that before the outburst coal seam is uncovered in Shimen, the comprehensive index method, the drilling cuttings gas desorption index method or other methods that have been proved effective by tests should be used to predict the risk of outburst at the working face. However, in actual use, the comprehensive index method is mainly used for coal mining in Shimen and shaft shafts. [0003] Coal and gas outburst is a dynamic phenomenon that occurs in soft coal containin...

AI Technical Summary

Problems solved by technology

) The shortcomings of this method are: the pressure measurement takes a long time, usually 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

Images