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Experimental Research on the Instability Characteristics of Double-layer Rock Plates Based on MTS-AE System |
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PP: 339-345 |
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Author(s) |
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Shuren Wang,
Paul Hagan,
Yan Cheng,
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Abstract |
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| The deformation and failure process of four classes of double-layer rock plates were researched experimentally with the new
loading device under concentrated load based on MTS-AE system. The force-displacement curves and the force-time-acoustic emission
event rate curves were obtained through the experiments. The results showed that there were three failure modes of beam fracture, arch
destruction and plate fracture damage in the upper plate of the double-layer rock plates; all the lower plates of the four classes of rock
plates produced the beam fracture damage. There were four distinct mechanical response stages in the force-displacement curves; three
types of mechanical behavior of the double-layer rock plates arose after the second load peak, which were post-peak yielding, post-peak
hardening and post-peak softening; the bearing capacity of the double-layer rock plates is usually greater than that of the single-layer
rock plate. It showed that the acoustic emission events were not only in the phase before the peak value, but also in the post-peak phase. |
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