Q45
In longwall mining subsidence phenomenon, the "angle of break" is the angle between
A.
The vertical line at the panel edge and line connecting the panel edge and zero subsidence on the surface
AnswerB.
The vertical line at the panel edge and line connecting the panel edge and point of critical deformation on the surface
C.
The vertical line at the panel edge and line connecting the panel edge and point of the maximum tensile strain on the surface
D.
The horizontal line and the line connecting the panel edge and zero subsidence on the surface
Answer: Option A
Solution
Answer: Option A
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