Method and device for support design of three-soft coal bed mining roadway

Abstract

The invention provides a method and device for support design of a three-soft coal bed mining roadway, and belongs to the technical field of coal mining. The problems that in the prior art, support parameter design for the three-soft coal bed mining roadway is not reasonable, and consequently roadway supports fail, the roadway repair cost is increased, and safe and efficient production of mines is seriously affected can be solved. The method includes the steps that the structure of the three-soft coal bed mining roadway is sequentially divided into a roadway roof, two roadsides and a roadway floor from top to bottom; a roof limit equilibrium arch equation, the roof limit equilibrium arch height and the maximum damage depth of the two roadsides are sequentially determined according to the limit equilibrium ring theory of surrounding rock of the three-soft coal bed mining roadway and stress analysis of a rock layer of the roadway roof, coal layers at the two roadsides and a rock layer of the roadway floor; the roof anchor rope length is determined according to the roof limit equilibrium arch height, the anchor rope anchoring section length and the anchor rope exposed length; and the lengths of anchor rods of the two roadsides are determined according to the maximum damage depth of the two roadsides, the anchor rod anchoring section length and the anchor rod exposed length.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and more specifically relates to a design method and device for roadway support in three-soft coal seam recovery. Background technique [0002] In my country, more than one-third of the mining roadways belong to the three-soft coal seam mining roadway. With the development of mine mining, the areas with good geological conditions are gradually decreasing, and more and more coal mines are faced with the mining of three-soft coal seams. The support problem of coal seam mining roadway is becoming more and more serious. [0003] The surrounding rock of the mining roadway in the third soft coal seam is composed of easily deformable soft rock and soft coal seam. Due to its own weak strength and poor self-stability, under the influence of the stress of the original rock and the support pressure formed by mining, it is easy to cause the two roadsides to move closer and the bottom Drums, roof sinking ...

AI Technical Summary

Problems solved by technology

[0011] The embodiment of the present invention provides a method and device for designing roadway support in three-soft coal seams, which can solve the problem of unreasonable design of roadway support parameters in three-soft coal seams, breakage of anchor cables and bolts, and roadway deformation, resulting in increased roadway repair costs. Large, seriously affecting the normal production of the mine

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