Curtain grouting space suitable for gob-side entry retaining composite roof and construction method

Abstract

According to the curtain grouting space suitable for the gob-side entry retaining composite roof, the curtain grouting space of the gob-side entry retaining composite roof is of a large-end-up closed space structure; the top face of the curtain grouting space of the gob-side entry retaining composite roof is an overlying rock layer, and the four side faces of the curtain grouting space of the gob-side entry retaining composite roof are a roof crack non-development area on the side of solid coal to be mined, a gob side grouting curtain, gob-side entry retaining transverse grouting curtains on the front side and the rear side and a concrete grout stopping layer on the surface of the bottom face composite roof. The curtain grouting space can effectively prevent the problem of grouting slurry leakage of the gob-side entry retaining composite roof, the grouting effect and the overall strength of the composite roof are remarkably improved, and the integrity, stability and safety of the gob-side entry retaining roof can be guaranteed.

Description

technical field [0001] The invention relates to the field of mining engineering, in particular to a curtain grouting space and a construction method suitable for a gob-side entry retaining compound roof. Background technique [0002] With the continuous improvement of coal mining methods and the improvement of the level of mechanical equipment, gob-side entry retention has become one of the important directions of scientific mode and technological development of coal mining in deep mines in my country. It is an important way to realize co-mining of coal and gas in deep coal seams. my country's coal industry has developed rapidly and has been popularized and applied in many mining areas and occupies a prominent position. However, the mining mode of deep gob-side entry retaining will inevitably lead to a significant increase in the range and peak value of lateral support pressure in the stope, severe mining impact and serious mine pressure. The construction and development of ...

AI Technical Summary

Problems solved by technology

At the construction site, grouting was tried to strengthen the overlying rock of the roof. However, due to the leakage and running of the overlying rock at the edge of the gob, the effect of grouting reinforcement on the composite roof of the gob-side entry was seriously affected, resulting in the grouting of the roof. The compactness of the structure is poor and it is difficult to form a complete load-bearing structure, which cannot effectively guarantee the integrity, stability and safety of the roof of the entry retaining. As a result, some mines did not achieve the expected effect when applying the technology of retaining the entry along the gob, and even failed to retain the entry. Thus limiting the wider application of gob-side entry retaining technology in my country

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