A Coordinated Deformation Quantitative Design Method for Gobside Entry Retaining Support System

Abstract

The invention discloses a quantitative design method for coordinated deformation of a gob-side entry retaining support system, which first constructs a gob-side entry retaining support system, then establishes a structural mechanics model, and obtains the allowable deformation of the anchored coal body on the solid coal side according to the mechanical model The maximum rotation angle of the basic top rock beam under the four situations of the limitation of the quantity limit, the limit of the allowable deformation of the filling body beside the roadway, the limit of the service requirements of the roadway section along the gob-side retaining roadway, and the limit of the maximum deformation of the gangue in the goaf, according to the four situations Quantitative design of the surrounding rock support for gob-side entry retaining is carried out based on the relative size of the maximum rotation angle of the basic top rock beam. Based on controlling the optimal turning angle of the basic roof beam in the lateral direction, the present invention proposes the quantitative design of supporting systems such as coordinating the side of gob-side retaining roadway with anchor coal body, roadside filling body, and deformation capacity of gangue body in the goaf method, the goal of coordinating and deforming the support system for gob-side entry retention was achieved, and the gob-side entry retention under different conditions was successfully realized.

Description

technical field [0001] The invention relates to the technology of gob-side entry retention in coal mining working face of coal mines, in particular to a method of coordinating deformation of gob-side entry entry retention by adding anchor coal body, side filling body and gob gangue body to the solid coal side of gob-side entry entry retention Methods of support design. Background technique [0002] In order to reduce the loss of coal pillars between coal mining sections, mines often adopt coal pillarless mining, that is, the roadway that keeps the working face of this section along the goaf and serves the mining working face of the next section is called gob-side retention. lane. Gobside entry retaining realizes coal pillar-free mining, reduces the amount of tunneling, alleviates the tension of mine connection, and has obvious social and economic benefits. [0003] Now our country has successfully realized gob-side entry retention in coal mining face of thin coal seam, med...

AI Technical Summary

Problems solved by technology

The field practice shows that under the complex conditions of large buried depth, hard roof, and large mining height, the implementation of gob-side entry retaining, due to the difference in the bearing capacity (deformation or strength) There is a large difference, and when one or two items are far from their bearing limit, the other item is damaged and unstable due to excessive load, which seriously threatens the safety of the lane.

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