Structure and method for building side direction multicolumn gob-side entry retaining filling wall body

Abstract

The invention discloses a structure and a method for building a side direction multicolumn gob-side entry retaining filling wall body. The structure comprises a gob-side entry retaining side wall body and a goaf side wall body, wherein the gob-side entry retaining side wall body and the goaf side wall body are arranged at intervals. High foaming polyester materials are filled between the gob-side entry retaining side wall body and the goaf side wall body to form a middle layer wall body. The gob-side entry retaining filling wall body is divided into three columns or a plurality of columns in the lateral direction. Reinforcing ribs are arranged inside the gob-side entry retaining side wall body which serves as a main load bearing wall body and is used for supporting a top plate. The goaf side wall body is used for adapting to revolution and sinking of an overlying rock, fracture of the overlying rock is admitted, and the function of yielding is played. The middle layer wall body is formed by the high foaming polyester materials to seal a goaf, and therefore three-column wall bodies are enabled to form a unified wall body. Compared with a whole pouring filling wall body, the three-column filling wall bodies can well adapt to a surrounding rock motion law and has a good supporting effect. In addition, in terms of a mine which has good qualifications and has no risk of overflowing of gas, a step of pouring the high foaming polyester materials is omitted, a space retained between the two-column wall bodies can provide a heaving floor compensation space, and a heaving floor in the gob-side entry retaining is relieved.

Description

technical field [0001] The invention relates to a structure and a method for constructing a lateral multi-row filling wall for gob-side entry retention, and is especially suitable for the field of side-side support of gob-side entry retention. Background technique [0002] Gob-side retaining means that after the upper section of the working face is mined, the machine lane of the original working face is retained by strengthening the support or adopting other effective methods, so that it can be used as a return airway when the lower section of the working face is mined. At this time, one side of the reserved roadway is the goaf, and the other side is the coal body. The purpose is to make one roadway be used twice. According to the analysis of the existing continuous mining system without coal pillars, gob-side entry retention can generally increase the mine recovery rate by more than 10%, and the roadway excavation rate and roadway maintenance costs can be reduced by about 3...

AI Technical Summary

Problems solved by technology

However, the construction of the gangue belt is labor-intensive and takes a certain amount of time. The air leakage in the goaf is serious, and the effect of sealing the goaf is poor, and it is difficult for the filling body and the gangue wall to be in close contact with each other to form a complete whole. It is inevitable that when the roof is pressed sliding instability

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