Opencast combined mining method of steeply inclined coal seam groups

Abstract

The invention provides an opencast and underground combined mining method of steeply inclined coal seam groups; the detailed implementation method comprises the following steps: opencast construction is carried out downwards in a certain angle along the inclined direction of the steeply inclined coal seam group, the construction is conducted to reach a certain distance deeper than that when the first coal seam appears, then horizontal construction is conducted until all of the steeply inclined coal seam groups are penetrated, and then the construction is continued back to the surface of the earth at a certain angle; at the location with a certain distance below the coal seam, another construction gallery is dug and penetrated through along the trend of the coal seams; transportation equipments are arranged in a laneway, the laneway is used for placing top coal or other coal mining methods are adopted, the coals mined are carried into the construction gallery by the laneway transportation equipment, and then are transported to a mine coal plant. The opencast and underground combined mining method of the steeply inclined coal seam groups solves a plurality of problems such as high mining cost and low resource recovery rate and the like in the opencast of the steeply inclined coal seam groups, simultaneously solves the problems such as low safety, high labor intensity, low efficiency and high cost and the like during the underground mining of the steeply inclined coal seam groups, causes the opencast mining to become underground mining and the underground mining to become opencast and ensures the complementation of the strengths and weaknesses, thus being a safe and highly efficient coal mining method of the steeply inclined coal seam groups and having good social benefit and economic benefit.

Description

1. Technical field [0001] The invention belongs to an open-pit combined mining method of steeply inclined group coal seams, and in particular relates to a steeply inclined group coal seam, open-pit and underground combined mining method. 2. Background technology [0002] At present, the open-pit mining method of the steeply inclined coal seam is to excavate the soil layer along the direction of the coal seam, strip the bedrock, and then carry out coal mining after the coal seam is exposed. The disadvantages of this method are as follows: [0003] 1. Since the inclination angle of the coal seam in the steeply inclined group is greater than 45 degrees, a certain slope angle is required for open-pit mining. Generally, the slope angle is less than 45 degrees. The coal seam cover layer needs to be stripped, and the coal seam roof and floor need to be stripped. The stripped cover layer is nearly More than 1.5 times that of horizontal open-pit coal mines. [0004] 2. This coal min...

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Problems solved by technology

[0004] 2. This kind of coal mining method has a high stripping ratio. Generally, it has no mining value when it reaches the economic balance point. It must be mined underground, which is not economically cost-effective.

[0005] 3. Due to the steeply inclined group of coal seams, the open-pit mining depth is relatively low, and the design life of the open-pit coal mine is greatly reduced

[0006] 4. For open-pit mining of steeply inclined coal seams, open-pit mining is only carried out for thick coal seams with relatively good economic benefits, and thin coal seams with relatively poor economic benefits lose their mining value

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