Pre-grouting method for ultra-deep hole and high-pressure two-way roadway in large-scale geological structure fissure coal-rock mass

Abstract

The invention relates to the field of coal mining and grouting, in particular to a high-pressure two-alley pre-grouting method for a super deep hole of large geologic structure crack coal-rock mass. The high-pressure two-alley pre-grouting method comprises the following steps of: obtaining a working face histogram, field drilling peeping sights and large geologic structure occurrence or a crack coal-rock mass range in a coal-mining working face; according to a coal-mining geological condition, determining a rock structure, lithology, coal-rock mass strength, geostress field type, a working face extraction process, an advance supporting pressure peak value, periodic weighting length and working face gas drainage layout; according to construction parameters, determining drilling height, a drilling angle, drilling depth, a hole sealing position, hole sealing section number, a hole sealing way and a grouting wall; and performing two-alley grouting according to high-pressure pre-grouting drilling parameters. The high-pressure two-alley pre-grouting method performs grouting reinforcing on coal-rack cracked bodies at different positions, restores integrity of crack coal-rock mass and the geologic structure, improves physical and mechanical properties of the coal-rock mass, improves stability of the crushed coal-rock mass, reduces influences on production, and increases a coal resource recovery rate.

Description

technical field [0001] The invention relates to the field of coal mining grouting, in particular to a super-deep hole high-pressure two-way pre-grouting method for coal and rock mass with large geological structure fissures. Background technique [0002] my country's coal-based energy structure will exist for a long time. With the sustained and stable development of my country's economy, the demand for coal resources is gradually increasing, and the requirements for high-yield and high-efficiency coal mines are getting higher and higher. However, my country's coal mines are dominated by underground mining, and the occurrence conditions of coal resources are greatly affected by geological factors. During the production process of coal mines, geological structures such as faults, folds, and fracture development zones are often encountered. Accidents of slabs, large-area roof caving and water inrush, and cracks in the coal and rock mass of the working face are developed. During ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a pre-grouting method for ultra-deep holes and high-pressure two lanes in large-scale geological structure fissure coal and rock mass, so as to solve the problem that the structure of large-scale structural fissure coal and rock mass is incomplete and affects the stability of coal mining

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