A Method of Impact Risk Assessment Based on Roof Rock Structure

Abstract

The invention discloses an impact risk assessment method based on the structure of the roof strata, which firstly determines the impact risk assessment object and area range, then collects geological and mining-related information in the impact risk assessment area, and then treats the impact risk based on the collected geological and mining information. Carry out grid division in the evaluation area, calculate the characteristic parameter values ​​of the roof thickness of each geological borehole, and determine the characteristic parameter values ​​of the roof thickness of all grid nodes; finally perform interpolation processing on the characteristic parameter values ​​of the roof thickness in the area to be evaluated; and determine different roof thicknesses The impact hazard level corresponding to the characteristic parameter value. This impact risk assessment method based on the structure of the roof strata can make full use of the characteristics of all geological boreholes in the area to be evaluated, realize a more reasonable and accurate evaluation of the structural characteristics of the roof strata, and avoid the limitations and singleness of artificially selecting geological boreholes. The evaluation results are closer to the actual conditions on site.

Description

technical field [0001] The invention relates to the technical field of coal and rock dynamic disaster prevention and control, in particular to an impact risk assessment method based on a roof rock layer structure, which is suitable for impact risk assessment of coal seams, mining areas and working faces in mines. Background technique [0002] Rock burst is a typical mine dynamic phenomenon. This dynamic phenomenon is extremely destructive and poses a great threat to mine production safety and employee life safety. With the increase of mine mining depth and intensity, rock burst disasters Dramatic increase. [0003] Therefore, accurate and effective impact risk assessment results are of great significance to prevent the occurrence of rock burst disasters. First, it is necessary to analyze the inducing factors of the impact risk, evaluate the impact risk of the mining area, and obtain the impact risk area through the evaluation results. and hazard level, so as to guide the fo...

AI Technical Summary

Problems solved by technology

[0004] The structure of the roof strata above the coal seam has an important influence on the occurrence of rock burst, and the evaluation of the structural characteristics of the roof strata is an important part of the impact risk assessment; the existing evaluation methods for the roof strata structure mostly use the thickness characteristic parameter value Lst of the roof strata Evaluate the impact risk of rock formations, but the traditional calculation method considers a single factor, is greatly affected by human factors, and has certain limitations in the application of mines under different conditions

For example, in the traditional calculation method, it is unreasonable to determine the ratio of the decline coefficient of the weak plane of the rock formation only based on the lithology. Under different mine geological conditions, the properties of the same lithology roof rock formation may be quite different

In addition, for the impact risk assessment in a large area, the selection of representative geological boreholes determines the impact risk assessment results, and the selection of geological boreholes is mainly artificially selected, which is greatly affected by human factors, resulting in unreasonable assessment results

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