Method for determining coal mine rock burst charge monitoring index and critical early warning initial value thereof

Abstract

The invention provides a method for determining a coal mine rock burst charge monitoring index and a critical early warning initial value thereof. The method comprises the following steps: sampling and processing on site; installing and testing the charge monitoring system, the loading system and the shielding system; performing a laboratory test on a charge induction rule in the uniaxial compression damage process of the coal sample; determining charge monitoring indexes (average charge quantity and charge quantity variation coefficient) according to a coal sample charge induction law test result; determining a charge critical coefficient according to the ratio of the average charge quantity to the charge quantity variation coefficient in the compaction elasticity stage and the reinforced damage stage in the coal sample fracture process; on-site charge monitoring is carried out in the mining-influence-free area of the rock burst mine coal seam roadway, and a charge monitoring index standard value is obtained; and multiplying the charge monitoring index standard value by the charge critical coefficient to obtain the critical early warning initial value of the corresponding mine rock burst charge monitoring index. By means of the method, the charge monitoring index early warning initial value can be rapidly and conveniently determined, quantitative and precise monitoring can be conducted on deep mine rock burst disasters through the charge induction technology, and the method has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of mine safety mining, and particularly relates to a method for determining a coal mine impact ground pressure and charge monitoring index and a critical early warning initial value thereof. Background technique [0002] With the reduction of shallow coal resources in my country year by year, coal mining has gradually shifted to the deep, resulting in a significant increase in the frequency and intensity of rock bursts, which seriously restricts the safe and efficient mining of deep coal resources. Therefore, the research on monitoring methods and means of rock burst disasters has become an important scientific issue to ensure the safe and efficient mining of coal resources. [0003] During the deformation and failure process of coal and rock mass, charges are generated due to factors such as piezoelectric effect, friction, and the separation of tip charges caused by micro-fractures. The charge signal genera...

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Problems solved by technology

However, most of the previous studies on charge induction were under different loading methods or different types of coal and rock samples, from the perspective of sample failure stress changes to study the law of coal and rock charge changes, or the law of charge induction in rock burst mine roadways. Qualitative research on the relationship with the distribution of advanced abutment pressure did not give the charge monitoring index and critical early warning value of coal-rock dynamic disasters, so it is difficult to provide effective guidance for monitoring and early warning of rock burst

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