Method and device for calculating standard depth/thickness ratio of coal mine goaf overhead transmission line

Abstract

The invention relates to a method and a device for calculating the standard depth / thickness ratio of a coal mine goaf overhead transmission line. The method comprises the following steps: calculating the average density and the density coefficient of every rock and soil layer in goaf overlying strata; using the overlying rock and soil layer as a special medium, and calculating the inflection point depth / thickness ratio and the subsidence disturbance coefficient of the overlying rock and soil layer according to the average density, the density coefficient, the coal seam mining thickness and the inflection point depth / thickness ratio; and calculating the standard depth / thickness ratio according to the inflection point depth / thickness ratio and the subsidence disturbance coefficient of the overlying layer. The device includes an average density calculation module, a density coefficient calculation module, an inflection point depth / thickness ratio calculation module, a subsidence disturbance coefficient calculation module, a standard depth / thickness ratio calculation module and a maximum subsidence rate calculation module. The method considers the influences of the density of the overlying layer, the mining depth and the thickness on surface deformation, compares the obtained standard depth / thickness ratio with the number 1, analyzes the relationship between the relation between the standard depth / thickness ratio and the surface deformation, and solves the standard disunity problem caused by geological differences of different areas. The device can accurately calculate the standard depth / thickness ratio and the maximum subsidence rate.

Description

technical field [0001] The invention belongs to the field of disaster prevention design and protection of overhead power transmission lines, and in particular relates to a calculation method and device for the standard depth-thickness ratio of overhead power transmission lines in goaf areas of coal mines. Background technique [0002] High-voltage transmission lines are the main channel for long-distance power transmission, and they must be safe, reliable and foolproof during operation. After the underground coal mine is mined, it will form a mining-influenced area, which will cause mining deformation on the surface. When the transmission tower is located in the mining-affected area, because it is extremely sensitive to the ground movement and deformation caused by mining, the safety of high-voltage transmission lines will be greatly affected. The evaluation of the surface stability of coal mine goaf is especially important for the safe and reliable operation of transmissio...

AI Technical Summary

Problems solved by technology

Although this method is widely used and simple, there are some problems. First, the depth-thickness ratio is generally determined based on experience, and there is no standardized calculation method; It is not convenient for engineering application; the third is that the current surface subsidence model essentially regards the overlying layer as a single medium, and determines the relevant limits based on experience, without considering the properties of the overlying layer

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