Complex geological condition fully-mechanized working face split-close type fault crossing method

Abstract

The invention provides a split-and-combined method for crossing a fault in a fully mechanized mining face with complex geological conditions, and relates to the field of coal mine production. The steps mainly include: 1) before the production of the working face, build a roadway at a position close to the trough of the track to bypass the fault; 2) When the mining of the upper section of the working face advances to the fault, remove the equipment in the shrinking part; 3) Install the equipment at the newly opened cutting hole; 4) The working face closes. The efficient promotion of the technical scheme of the present invention provides a guarantee for the safe and efficient advancement of the fully mechanized mining face, increases the recovery rate of coal resources, and reduces a large amount of additional construction costs for moving and reversing costs; at the same time, it avoids the failure of the working face equipment due to crossing faults. It is damaged; it ensures the calorific value of coal, improves economic benefits, and has good practicability.

Description

Technical field [0001] The invention provides a method for splitting and combining faults in a fully mechanized mining face under complex geological conditions, and relates to the field of coal mine production. Background technique [0002] Due to the complicated coal-forming conditions of the coal seams, the coal-bed storage conditions are unstable. The coal mining face often encounters hard faults (hard rock formations) and other geological structures. The method has a greater impact on the safety of the working face. Mainly manifested in the following aspects: [0003] (1) The roof of the working face is difficult to control. After the fault is exposed on the working face, the rock section is usually loosened by the method of loosening the gun, and then cut by the coal machine. The blasting further destroyed the originally broken roof, the pressure on the roof increased sharply, and roof fall accidents occurred from time to time, and the management of the roof was very diffic...

AI Technical Summary

Problems solved by technology

Blasting further damages the originally broken roof, the pressure on the roof increases sharply, roof fall accidents occur from time to time, and the management of the roof is very difficult

[0004] (2) The equipment on the working face is seriously damaged

Although protective measures were taken for the equipment on the working face when the gun was released, the hydraulic support could not be effectively protected, causing serious damage to the hydraulic pipeline, operating valve, and column of the support; the rock after the loose gun was still cut by a coal machine, As a result, the consumption of the picks of the coal mining machine is greatly increased, and the roller of the coal mining machine is severely worn; the middle groove of the scraper conveyor wears faster, and the chain is often broken

[0005] (3) The calorific value of coal is reduced

When the working face passes through the fault, a large amount of gangue is mixed into the coal, which increases the ash content of the raw coal and reduces the calorific value, which directly affects the economic benefits

[0006] (4) The speed of advancement will be significantly slowed down, affecting production efficiency

The normal monthly advance rate of the general working face is about 80 meters, and it is difficult to complete 40 meters per month during the fault crossing period, which affects the completion of the production of the whole mine.

[0007] (5) Civilized construction is poor

Splashing water and large pieces of gangue often cause the belt to deviate, slip, and coal gangue to be scattered, etc. The mud and water in the roadway seriously affect the civilized construction

[0008] At the same time, when the working face encounters a large gap in the fault, pushing hard will bring great pressure to the safety of production.

If all mining is skipped, the recovery rate of coal resources will be reduced, resulting in a large waste of resources

Substantial increase in construction costs

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