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Formation and type of coal-coal seam occurrence
Release time:
2022-11-22
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Formation and type of coal-coal seam occurrence
Coal seam occurrence
The occurrence of coal seam has three elements: trend, inclination and inclination.
1.
The intersection of the coal seam plane with any imaginary horizontal plane is called strike, I .e., two equal heights on the same plane.The connecting line of the points and the direction of the strike line are the strike of the coal seam.
2. Tendency
A line on the coal face perpendicular to the strike line and down the slope is called the dip line (it represents the coal face.of the maximum slope). The direction indicated by the projection of an inclined line on a horizontal plane, I .e. the inclination, inclination and directionVertical.
3. Inclination
The angle between the inclined line orthogonal to the strike line on the coal seam surface and its projection on the horizontal plane is called the dip angle. TiltThe size of the angle indicates the degree of inclination of the coal seam, which can be divided into true inclination and apparent inclination. True dip angle is equivalent to coal planeThe maximum angle with the horizontal plane, while the apparent dip angle is the sum of any straight line on the coal seam surface that is oblique to the strike line.The angle of the projection of the line on the horizontal plane. The apparent inclination is always less than the true inclination, which is generally found on natural profiles.The dip angle of coal seam seen is mostly apparent dip angle.
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