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As a nondestructive method, GPR is widely used in detection the distribution of the broken rock zone surrounding laneways. For deep coal mining engineering, the rock surround laneways would experience several damages. The broken rock is a special composite medium by rock, fracture which is filled with water or air. Although, a lot of researches about the electromagnetism of rock have been done, mostly...
Aiming at the actual loading state of outer shaft lining, the mechanical model was established. The calculational formula of ultimate loading capacity of outer concrete shaft lining based on three relatively applicable biaxial failure criteria was deducted, and compared with the result based on triaxial failure criteria. The results show that it will exorbitant estimate the ultimate loading capacity...
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