Research Article
Fracture Mechanism in Overlying Strata during Longwall Mining
Figure 3
The contour maps of stress distribution of KS: (a) normal stress on the upper surface of KS; (b) normal stress on the upper surface of KS; (c) shear stress on the upper surface of KS; (d) normal stress on the section of KS; (e) normal stress on the section of KS.
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