Coal seam floor water-inrush risk evaluation method

Abstract

The invention discloses a coal seam floor water-inrush risk evaluation method. The evaluation method comprises a first step of building fuzzy subjection functions of each influencing factor, a second step of applying a step-by-step discrimination method to distinguish influencing capabilities of the influencing factors, a third step of building the coal seam floor water-inrush risk evaluation method on the basis of a nonlinear discriminant analysis model and on the basis of a reproducing kernel theory and a discriminant analysis theory according to the coal seam floor water-inrush influencing factors screened out in the second step, and a fourth step of performing water-inrush risk evaluation on a working face with the floor water-inrush risk by combination of an intuitive discrimination method according to the built model. The influencing capabilities of the coal seam floor water-inrush influencing factors can be analyzed objectively, the influencing factors obvious in influence are effectively screened out, interference to evaluation results caused by the factors which are weak in influencing capabilities is reduced, the nonlinear discriminant analysis model is built on the basis of existing water-inrush sample data, and the nonlinear method is scientific and practical in comparison with previous methods.

Description

technical field [0001] The invention relates to an evaluation method, in particular to a method for evaluating the risk of water inrush from a coal seam floor. Background technique [0002] Coal is an important basic energy source in China. my country's coal resources are very rich and its uses are very extensive, which is of great significance to the development of my country's national economy. In 2011, coal accounted for more than 70% of China's primary energy consumption structure, which shows that coal's dominance in primary energy production and consumption has not been shaken. In terms of coal consumption, coal consumption in the power, steel, building materials and chemical industries accounts for more than 80% of coal consumption. [0003] However, with the continuous increase of coal production, more and more safety issues are coming. In 2011, the national death rate per million tons of coal was 0.564, a year-on-year decrease of 1 / 4, and the death toll fell below...

AI Technical Summary

Problems solved by technology

If all factors are used indiscriminately to establish an evaluation system, it will not only increase the amount of calculation and calculation difficulty, but also may reduce the calculation accuracy due to the correlation between influencing factors.

On the other hand, when some factors with weak influence ability are introduced into the evaluation system, it will interfere with the evaluation effect, resulting in the establishment of an evaluation model that is not robust.

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