Method and device for calculating equivalent minable thickness ratio of coal mine goaf for overhead transmission line

Abstract

The invention discloses a method and device for calculating an equivalent minable thickness ratio of a coal mine goaf for an overhead transmission line. The method comprises the following steps: calculating an equivalent thickness of each rock-soil layer above the gaof; accumulatively summing the equivalent thicknesses (shown in the specification) of all the layers of an overlying rock-soil layer so as to calculate a total equivalent thickness, corresponding to a standard medium, of the overlying rock-soil layer; calculating the equivalent minable thickness ratio of the goaf according to a mining thickness of a coal bed and the total equivalent thickness of the overlying rock-soil layer. Based on sufficient calculation theoretical basis and comprehensive consideration, a result is reliable; the influence degree of the thickness and the nature of the overlying rock-soil layer on surface deformation can be reasonably considered; the severity of actual surface deformation can be accurately reflected; evaluation of the dangerousness of the surface deformation of the goaf where the transmission line passes can be facilitated; determination of a reasonable planning, construction and operation technical scheme for the overhead transmission line of the coal mine goaf can be facilitated; the method has important guidance significance and reference value for guaranteeing the safety of the transmission line.

Description

technical field [0001] The invention belongs to the field of disaster prevention design and protection of overhead transmission lines, and relates to a calculation method and device for the equivalent mining thickness ratio of coal mine goafs of overhead transmission lines. Background technique [0002] Transmission towers are extremely sensitive to surface movement and deformation caused by mining. Mining of underground coal seams will cause surface movement and deformation, and the safety of high-voltage transmission lines will be greatly affected. However, how to evaluate the degree of influence of goaf surface deformation on the newly built upper transmission line has always been a problem that has not been completely resolved at home and abroad. [0003] At present, scholars at home and abroad generally divide the influence degree of the surface deformation through the size of the traditional mining thickness ratio, that is, the ratio of the burial depth of the coal sea...

AI Technical Summary

Problems solved by technology

However, due to the significant differences in the thickness and properties of the overlying rock and soil layers in different regions, simply using the ratio of the burial depth of the coal seam to its thickness to judge the degree of surface deformation of the goaf lacks a theoretical basis

The value of the same mining thickness ratio may correspond to completely different geological conditions, which cannot reflect the severity of the actual surface deformation, and may even lead to serious judgment errors

Therefore, based on the traditional mining thickness ratio to evaluate the impact of goaf surface deformation on surface transmission lines, and to determine the planning, construction and operation technical scheme of overhead transmission lines in coal mine goaf areas, there are serious safety hazards

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