Coal mine residual mining zone falling waste roadway grouting reinforcing technology and method

Abstract

The conventional coal mining technology employs roadway type high fall type coal mining, so mass empty roadways are left in a resource integration mine residual mining zone, wherein most roadways have roof caving problems, thus forming falling waste roadways; when the working face backstopping to penetrate the waste roadways, wall caving and roof caving can easily happen; a grouting reinforcing scheme must be taken to control top board accidents, yet the falling fracture zone is hard in drilling, and easy to leak slurry; the coal mine residual mining zone falling waste roadway grouting reinforcing technology and method uses a novel dual-liquid inorganic grouting material with a large water cement ratio adjustable scope, and employs the graded pore-forming and insert tube grouting technology so as to solve the jamming, hole collapse, and slurry leaking problems in the waste roadway falling fracture zone drilling grouting work, thus preventing working surface exploitation wall caving and roof caving problems; in addition, the method is simple in construction technology, obvious in effect, and wide in practicality.

Description

technical field [0001] The invention relates to the field of reinforcement of abandoned lanes in coal mines, in particular to a grouting reinforcement process and method for abandoned lanes in residual mining areas of coal mines. Background technique [0002] With the large-scale and high-intensity mining of coal resources, many coal mines in my country, especially resource-integrated mines, have the problem of passing waste lanes at the working face. These abandoned lanes are usually the coal lanes left by small coal mines using backward mining methods in the past. The existence of these waste lanes seriously affects the mining deployment of the mine and the production safety of the working face, and passing through them rashly can easily cause gas and roof accidents. According to the existing form of these waste lanes, they can be divided into complete type and collapsed type. Such as image 3 As shown, the first two waste lanes are complete type, and the third type is c...

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Problems solved by technology

[0004] The invention solves many problems such as drill sticking, hole collapse, and grout leakage that are often encountered in drilling and grouting in the caving and crushing area of ​​the waste roadway in the prior art, and avoids the problems of slabs and roof caving accidents during the mining of the working face. A technique and method of grouting reinforcement for caving and waste lanes in residual mining areas of coal mines is proposed

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