Early warning method of water inrush hazard in coal mine and calculation method of single crack development range in rock mass

Abstract

The invention relates to the field of coal mine safety monitoring, and is a coal mine water inrush risk warning method and a calculation method for the single crack development range of a rock mass, which can quantitatively analyze the damage degree of a water-resisting rock layer and has high precision. The method includes: 1. arranging vibration signal acquisition devices, and dividing the water-resistant rock formation into several water-resistant layers; 2. calculating the development range of a single crack in the rock mass; 4. Calculating the energy core density of the single crack development range of the rock mass in the microseismic event; 5. Computing the W ia with W i0 Compare; 6. Superimpose the comparison results in the vertical direction to obtain the ratio N of the number of water-resistant layers that meet the water inrush condition in the overlapping damage area, and compare the ratio N with the judgment threshold to obtain the early warning result; 7. Repeat Steps two to six. The invention solves the problem that the existing water inrush early warning method can only perform qualitative analysis on microseismic events and has low precision.

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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