Crack growth properties and AE phenomena in notched hard/soft layered rock under punch shear test; experimental test and numerical simulation by Seyed Davoud Mohammadi, Rahim Mortezaei, Vahab Sarfarazi, Arsham Moayedi Far

“…They prepared samples including one soft layer, one hard layer, a two-layered model with hard and soft rock layers, three layered model with a soft interlayer, and a four-layered model with two hard and two soft rock layers. …”
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Study on Energy Evolution Law of Rocks With Different Lithologies and Sizes by Yanchun Yin, Zitong Gao, Zhigang Zhao, Shudong He, Liyuan Liu, Guoying Li

“…Lab tests show that low‐stiffness machines will cause dynamic damage to the coal specimen, whereas hard rocks are more prone to coal bursts due to higher energy storage and release compared to soft rocks. The main reason for the deviation between the two is that the energy storage capacity of hard rock is greater than that of soft rock, and the storage‐release elastic energy of hard rock is greater than that of soft rock.…”
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