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← HistoryIn early Chinese mines, which outcome most often resulted when black powder explosions exceeded design limits?
A)Support collapse from seismic waves✓
B)Localized ore body pulverization
C)Accumulation of unreacted sulfur
D)Precise contour blasting efficacy
💡 Explanation
An overcharge would generate excessive seismic waves. This exceeds the rock's shear strength, creating cracks, triggering collapse by the mechanism of dynamic stress failure, because the stress exceeds material yield, therefore compromising structural integrity, rather than targeted fragmentation.
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