Mechanism of Secondary Breakage in the Overlying Strata during Repetitious Mining of an Ultrathick Coal Seam in Design Stage

Figure 10

Variation of maximum tensile stress on the hanging block with h₁ for different values of H, h₂, and h: (a) variation of maximum tensile stress on the hanging block with h₁ for different values of H; (b) variation of maximum tensile stress on the hanging block with h₁ for different values of h₂; (c) variation of maximum tensile stress on the hanging block with h₁ for different values of h.

(a)

(b)

(c)