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For the same SLW face, the limit angle of longitudinal direction is approximately equal to those of uphill (downhill), and exhibits a trend that the larger the mining depth the greater the limit angle, the larger mining thickness the smaller the limit angle, the thicker the topsoil the smaller the limit angle.
For the same face, the limit angle of longitudinal direction is approximately equal to those of uphill (downhill), and exhibit a trend that the larger the mining depth the greater the limit angle, the larger M the smaller the limit angle, the thicker the topsoil the smaller the limit angle.
And the limit angle of the leveling control was set up to be +/- 7°.
On the condition that the mining depth of summarized SLW faces are approximately equal to each other, the limit angle decreases with the reduction of the ratio (H/M), thus the subsidence basin is relatively larger.
According to the theory of mining subsidence (Zou et al. 2003), the boundary of the trough is generally described by the parameters of the angle, such as the angle of critical extraction, angle of greatest subsidence, limit angle, angle of displacement and angle of crack.
Table 1 Angle parameters Angle of greatest subsidence θ Limit angle Displacement angle Crack angle Angle of critical extraction Longitudinal direction δ 0 Uphill γ 0 Downhill β 0 Longitudinal direction δ Uphill γ Downhill β Longitudinal direction δ″ Uphill γ″ Downhill β″ Uphill ψ 1 Downhill ψ 283.95552577683848888895150 88 89 51 50.
Similar(53)
Generally, the limit angles depend on the angle of the seam inclination, α.
The limit angles on the lower and upper sides of the panel (γH and γL), respectively.
Furthermore, higher forming limit angles have been demonstrated for materials with low strainability at room temperature.
Drilling direction and limit angles are computed from an inverse projection of the limits of the pedicle on transverse and sagittal planes.
(2) In the similar circumstances, the limit angles of each SLW face are basically identical, the range of the boundary is approximately equal to H.
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