Method for allowing fully mechanized old residual coal re-mining working face to pass caving zone

Abstract

The invention relates to a method for allowing a fully mechanized old residual coal re-mining working face to pass a caving zone. By aiming at the old residual coal re-mining working face passing thecaving zone, an incomplete layered grouting technology is proposed on the basis of established grouting support layer model and theory, that is, broken surrounding rock in the caving zone in front ofthe re-mining working face is subjected to layered grouting with different slurries to form a cutting layer and a grouting support layer, caving surrounding rock at the upper part of the grouting support layer is not grouted, the cutting layer is grouted to facilitate cutting by a coal mining machine, and after treatment, the re-mining working face safely and efficiently passes the caving zone. According to the method, the grouting support layer theoretical model is established firstly, the incomplete layered grouting technology is proposed on the basis of the model, the grouting cost is reduced, and the economic benefit of a coal mine enterprise is increased.

Description

technical field [0001] The invention relates to the technical field of residual coal re-mining, and more specifically relates to a method for crossing a caving area of ​​a fully mechanized caving and re-mining working face of old mining residual coal. Background technique [0002] In the 1980s and 1990s, due to insufficient technical and equipment conditions, local small coal mines in my country used backward coal mining methods such as knife column type and lane column type (high drop type) for a long time, and the recovery rate was less than 20%, resulting in a large number of Most of the high-quality coal resources are left in the goaf, causing great waste. Realizing the re-mining and utilization of old mining residual coal, that is, the re-mining of residual coal, can make full use of precious coal resources and create huge economic benefits, which has important practical significance for the sustainable development of mines. [0003] Affected by the old mining, the occu...

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Problems solved by technology

Publication No. CN111075476A discloses "A Coal Shearer Airborne Roof Fall Handling Robot and Its Construction Method", which solves the need for empty roof and high-elevation operations during the roof fall processing process, the construction is difficult and prone to secondary roof fall, and the construction personnel are safe. Difficult to guarantee and other issues; Publication No. CN109763861A discloses "a roof fall treatment method for fault fracture zone in the cutout" by manufacturing artificial false roofs and injecting expansion filling materials into the roof caving cavity area to reinforce the relatively broken roof area Support, finally clean up the falling area, build a construction platform, carry out square timber roof penetration and install hydraulic supports in groups

On the whole, the above public methods are mostly for local high-risk areas, and are not suitable for re-mining in areas where there are a large number of old mining residual coal.

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