What are the advantages and disadvantages of inclined longwall mining method? What conditions apply?

2) Simple transportation system, less equipment and low transportation cost.

3) Because the mining roadway of inclined longwall working face can be driven along the coal seam and keep a fixed direction, the length of the working face can be kept unchanged, which creates excellent mining technical conditions for the working face and is conducive to comprehensive mechanized coal mining.

4) The ventilation route is short, the wind direction changes little, the ventilation structures such as wind bridge and damper are reduced, and the air leakage is less.

Good ventilation effect.

5) Strong adaptability to geological conditions.

6) The technical and economic effect is good, and the indexes such as unit yield, driving rate, coal recovery rate and cost per ton of coal in longwall mining method are obviously improved.

Disadvantages: 1) Long-distance inclined lane, difficulties in driving, auxiliary transportation and pedestrians.

2) The existing coal mining face equipment is designed and manufactured according to the mining conditions of the strike longwall face, which cannot fully meet the production requirements of the inclined longwall face.

3) Every 2~4 sections, a coal bunker is arranged to connect with the alleys. There are many loading points in alleys, and the transportation interference between adjacent sections is great.

4) Sometimes, there is the problem of dirty wind descending.

Application: 1) is generally used for coal seams with dip angle less than 120.

2) After taking effective technical measures, the coal mining face equipment can be used in 120~ 170 coal seam.

3) Inclined longwall or pseudo-inclined longwall mining method can be used for coal seams with developed inclined or inclined faults, as long as relatively regular zones can be roughly divided.

4) Inclined longwall mining method can be used for different mining depths, roof and floor rock properties and stability, mine gas emission and mine water inflow.