Method for determining thickness of flexible material of roadside flexible-strength double-layer composite support in gob-side entry retaining

Abstract

The invention discloses a method for determining the thickness of a flexible material of a roadside flexible-strength double-layer composite support in gob-side entry retaining. According to the structure of the roadside flexible-strength double-layer composite support in gob-side entry retaining, a flexible filling material is adopted by an upper layer and a high-strength filling material is adopted by a lower layer. When the thickness of the flexible filling material is determined, the sinking amount generated when a main rock-abutting beam of the working face in the side direction is in contact with gangue is used for determining the early-stage compression amount of a roadside filling body; due to the fact that the rigidity of the flexible filling material is equal to the initial rigidity of the high-strength filling material, the coefficient of compressibility of the flexible filling material is reckoned; early-stage deformation of the high-strength filling material can be ignored and due to the fact that the compression amount of the flexible filling material is equal to the early-stage compression amount of the roadside filling body, the thickness of the flexible filling material can be determined. According to the method, the flexible filling material is made to effectively control a top board to move, the best yielding effect is achieved, and the filling cost optimization is achieved.

Description

technical field [0001] The invention relates to a method for determining the thickness of a soft and strong double-layer composite support flexible material next to a gob-side entry retaining, and belongs to the technical field of support beside a goaf in a mine. Background technique [0002] Gobside entry retention is a coal pillar-free mining technology, which has the advantages of alleviating the continuous tension of the coal mining face, significantly improving the recovery rate of coal resources, and effectively extending the service life of the mine. At the same time, it conforms to the "high resource utilization rate, The road to sustainable development with guaranteed safety, good economic benefits, and less environmental pollution” is also in line with the development direction of green mining and scientific mining, and has received more and more attention. [0003] Roadside support is the key technology for the success of gob-side entry retention. Its development ...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings that the existing empirical analogy method cannot comprehensively and quantitatively consider changes in roof breaking motion law and filling material compression performance when determining the thickness of each layer of the roadside soft and strong double-layer composite filling body, the present invention provides an accurate and reliable The method for determining the thickness of the flexible filling material with soft and strong double-layer composite support next to the gob-side retaining entry, through this method, can make the flexible filling material effectively control the movement of the roof, maximize the yielding effect, and optimize the filling cost

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