Goaf air leakage prevention method for thin coal seam N00 mining method

Abstract

The invention relates to a goaf air leakage prevention method for a thin coal seam N00 mining method. An air inlet roadway and an air return roadway are formed on the two sides of a goaf. The goaf airleakage prevention method comprises the steps that a movable telescopic air barrier is arranged on one side, positioned at a working surface, of the goaf, wherein the movable telescopic air barrier is used for preventing airflow of a coal mining roadway from entering the goaf; and spraying layers are formed on the goaf on the sides of retaining roadways of the air inlet roadway and the air returnroadway, wherein the spraying layers are used for preventing the airflow of the roadways from entering the goaf. According to the goaf air leakage prevention method for the thin coal seam N00 miningmethod, the movable telescopic air barrier capable of preventing the air leakage of the working surface is arranged between the goaf and the working surface, so that the airflow of the working surfaceis prevented from entering the goaf; and spraying materials are uniformly sprayed to form the spraying layers on the sides of the retaining roadways formed by continuously formed gangue filling supports, so that the airflow of the roadways is prevented from entering the goaf, and the tightness of goaf at the roadway sides is guaranteed.

Description

Technical field [0001] The present disclosure relates to the technical field of mineral mining, and in particular, to a method for preventing air leakage in a goaf used for a thin coal seam N00 mining method. Background technique [0002] For a long time, thin coal seam mining has been affected by the mining environment, and there are problems such as difficult mining, narrow mining space, low mining height, low coal recovery rate, and equipment and personnel unable to work normally in this operating environment. In recent years, with the gradual maturity of medium-thick and thick coal seam resource mining technology, the research and development of thin coal seam mining technology and equipment is urgent. [0003] At present, thin coal seams are mined using the high-grade general mining double-drawing face N00 method, that is, no tunneling and no pillar mining technology is required. This method can reduce costs, improve profits and work efficiency. However, for this mining metho...

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Problems solved by technology

However, for this method of coal mining, the working face is arranged in the way of pulling the working face, which belongs to the forward mining method, and the ventilation method is "U-shaped". The roadway wall is composed of gangue filling. One side of the roadway is reserved as the air inlet roadway, and the other side of the roadway is reserved as the air return roadway. Since the extraction ventilation system is mostly used in the mine, the air pressure in the return air roadway is lower than that of the air inlet roadway. The air pressure in the air tunnel will be significantly lower than the air pressure on the working face. Under the action of the air pressure difference, the air flow in the air inlet roadway and the air flow in the working face will easily flow through the goaf and escape, which will aggravate the degree of air leakage in the goaf, resulting in the loss of The risk of spontaneous combustion of coal increases. At the same time, the escaping air flow carries toxic and harmful gases in the goaf, causing the concentration of toxic and harmful gases in the return air lane to exceed the limit. In addition, air leakage easily leads to insufficient air volume at the working face

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