Gob-side entry retaining support system coordinated deformation quantitative design method

Abstract

The invention discloses a gob-side entry retaining support system coordinated deformation quantitative design method. Firstly, a gob-side entry retaining supporting system is constructed; then a structural mechanics model is established; maximum rotation angles of the basic top rock beams under the four conditions of being limited by the allowable deformation of the anchored coal body of the solidcoal side, the allowable deformation amount of a gob-side filling body, the section service requirement of the gob-side entry retaining roadway and the maximum deformation amount of gangue in the gobare obtained according to the mechanical model; the gob-side entry retaining surrounding rock support is quantitatively designed according to the relative sizes of maximum rotation angles of the basic top rock beams under the four conditions. The method is based on the control of the optimal rotation angles of the lateral basic top rock beams; the quantitative design method for coordinating supporting systems such as gob-side entry retaining roadway side anchored coal, gob-side filling body and gob gangue deformation capacity is provided, the purpose of coordinating deformation and co-bearingof the gob-side entry retaining supporting system is achieved, and gob-side entry retaining under different conditions is successfully achieved.

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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