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Coal formation and type -- coal seam classification
Release time:
2022-11-23
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Coal formation and type -- coal seam classification
1. According to the dip angle of coal seam
(1) Near horizontal coal seam. Coal seams with a dip angle below 8 °.
(2) Slow inclined coal seam. The dip angle of the coal seam is 8 ° ~ 25 °.
(3) medium inclined coal seam (also known as inclined coal seam). The dip angle of coal seam is 25 ° ~ 45 °.
(4) Steep coal seam. Coal seams with a dip angle of 45 ° or more.
2. Classified by layer containing gangue
(1) Simple structure coal seam. There is generally no gangue in the coal seam, or occasionally 1~2 layers of stable gangue.
(2) coal seam with complex structure. There are more or many layers of gangue in the coal seam, and the number of layers, layers, thickness and rockSex changes greatly.
3. Classification by coal seam thickness
The thickness of a coal seam is the vertical distance between the roof and floor of the coal seam.
In coal seams with complex structures, the thickness of the coal seam can be divided into total thickness and beneficial thickness. The total thickness is included14 The full thickness of the gangue, the beneficial thickness is the thickness of pure coal that removes the gangue.
In practical work, according to the characteristics of mining technology, the thickness of coal seam is divided into three categories:
(1) Thin coal seam. Coal seam thickness is less than 1.3m.
(2) Medium thick coal seam. The thickness of coal seam is 1.3~3.5m.
(3) Thick coal seam. The thickness of coal seam is above 3.5m.
Sometimes it is customary to refer to coal seams with a thickness greater than 6m as extra-thick coal seams. China's medium thick coal seam and thick coal seam accountedThere is a larger proportion.
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