Coal mine water inrush danger early warning method and rock mass single fracture development range calculation method

Abstract

The invention relates to the field of coal mine safety monitoring, in particular to a coal mine water inrush danger early warning method and a rock mass single fracture development range calculation method which can quantitatively analyze the damage degree of a waterproof rock stratum and are high in accuracy. The method comprises the following steps: firstly, arranging a vibration signal acquisition device, and dividing a water-resisting rock stratum into a plurality of water insulation sub-layers; secondly, calculating the development range of a single fracture of a rock mass; thirdly, dividing all micro-seismic events to each water insulation sub-layer at an interval of time T; fourthly, performing energy nuclear density calculation on the development range of the single fracture of therock mass of the micro-seismic events; fifthly, comparing the Wi and Wi<0> of each grid of each water insulation sub-layer; sixthly, superposing the comparison results in the vertical direction toobtain a ratio N of the number of layers of the water insulation sub-layers of the overlapped damage area reaching the water inrush condition to the total number, and comparing the ratio N with a judgment threshold to obtain an early warning result; and seventhly, repeating the second step to the sixth step. The problems that an existing water inrush early warning method can only conduct qualitative analysis on the micro-seismic events and is low in precision are solved.

Description

technical field [0001] The invention relates to the technical field of coal mine safety monitoring, in particular to a coal mine water inrush risk early warning method and a calculation method for the development range of a single crack in a rock mass. Background technique [0002] As the coal mines in the central and eastern regions of my country gradually turn to deep mining, the problem of water inrush from the mine floor under pressure is becoming more and more serious. The water inrush process of the coal mine floor is a damage and rupture process caused by the mining disturbance of the floor water-resisting rock formation and the coupling effect of the confined water seepage. Its mechanism is complex and has a great impact on the safety of coal mine production. Therefore, monitoring and early warning of water inrush from the coal mine floor is an important measure to prevent water inrush accidents in coal mines. [0003] At present, microseismic monitoring technology ...

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Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention lies in the monitoring and early warning of water inrush in the prior art, which can only conduct qualitative analysis on agglomerative microseismic events, has a low degree of refinement, and cannot effectively guide the coal mine site to carry out water inrush risk protection. Provide a method for early warning of coal mine water inrush danger and a method for calculating the development range of a single crack in rock mass, which can quantitatively analyze the damage degree of each area of ​​the water-resisting rock formation, with high accuracy, and can effectively prevent coal mine floor water inrush accidents

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