Gob-side crossheading advanced grouting reinforcement method for high-ground-pressure soft-roof soft-coal and soft-floor coal seam

Abstract

The invention discloses a gob-side crossheading advanced grouting reinforcement method for a high-ground-pressure soft-roof soft-coal and soft-floor coal seam. The method comprises the following steps of determining a reinforcement range: determining a grouting reinforcement operation and a gob-side crossheading grouting reinforcement range thereof when roadway mine pressure appearance characteristics and similar condition roadway deformation characteristics conform to a preset range, wherein the gob-side crossheading grouting reinforcement range comprises the reinforcement length and the reinforcement part; selecting a reinforcement material: performing the reinforcement operation by using ordinary Portland cement, a high polymer material or a novel inorganic reinforcing material in a way of aiming at a specific reinforcement part; designing a reinforcement scheme: determining the grouting opportunity, and designing a reinforcement mode and hole arrangement parameters; and performing construction according to a reasonable process. A traditional supporting method for the gob-side crossheading of the high-ground-pressure soft-roof soft-coal and soft-floor coal seam is changed, the roadway maintenance is changed from traditional post-repair to advanced active reinforcement, supporting stability of the gob-side crossheading is guaranteed, and phenomena of repair while excavating and repair while mining are avoided.

Description

technical field [0001] The invention relates to the technical field of grouting for surrounding rocks in coal mine roadways, in particular to an advanced grouting reinforcement method for high ground pressure and three-soft coal seams along the hollow and along the groove. Background technique [0002] In recent years, the layout of the working face with small coal pillars in the reserved section has been widely adopted; [0003] The arrangement of small coal pillars in the reserved section, specifically, is to arrange the preparation work face along the trough in the coal body in the low-stress area on the side of the adjacent goaf. The pillar can effectively isolate the gas and water in the old empty area, prevent it from entering the new tunnel, and reduce the air leakage to the old empty area. Compared with the arrangement of leaving a large coal pillar, the stress concentration of the coal pillar is eliminated, and the recovery rate of coal resources is improved; [00...

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Problems solved by technology

[0004] The gob-side trenches arranged with small coal pillars in the reserved section are generally supported by anchor net cables, and under special conditions, frame shed support or frame-anchor composite support is used. The ground pressure is small and the coal body is hard. The above supports can generally be supported. It meets the requirements for mining use, but for the gob-side channel of the three-soft coal seam with high ground pressure, due to the development of cracks in the coal and rock mass, the softness and brokenness, and the superposition of the lateral bearing pressure of the old goaf and the advanced bearing pressure of mining, the deformation and damage of the roadway are serious. Due to the large sinking of the roof, serious bottom heave and large side displacement, a large amount of force must be invested in repairing, which is very unfavorable for safe and efficient recovery of the working face;

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