Experimental research on bump proneness of simulated layered rock specimens
LI Li1，2，ZHANG Yong1
(1. School of Resources and Safety Engineering，China University of Mining and Technology，Beijing 100083，China； 2. Department of Mining Engineering，West Virginia University，Morgantown 26506，USA)
In order to make clear bump proneness with different strength ofroof，coal and floor and whether strong roof and floor can trigger bump under static loading condition. Layered concrete specimens were prepared to simulate coal and rock of different strength. Uniaxial compression tests were conducted for concrete specimens in the MTS machine under static loading condition. Index of dynamic failure time，sound pressure level and uniaxial compression strength were used to assess the violent degree of failure which could reflect the bump proneness. The results show that coal is the crucial factor to determine the strength and bump proneness of the rock and coal system. Strong roof and floor can increase the bump proneness of weak coal，while，weak roof and floor can decrease the bump proneness of strong coal. In addition，the affect of roof and floor is closely related to the property of coal. When the coal is weak，strong floor can confine its deformation，especially with strong roof，the clamping action can increase bump proneness obviously. When the coal is strong，the affect of floor is negligible，but a stronger roof can increase the bump proneness；When both coal and floor are weak，the affect of roof is little. Under static loading condition，only strong roof and floor cannot trigger coal bump.
李 立1，2，张 勇1. 模拟层状岩层样品失稳的冲击倾向性实验研究[J]. 岩石力学与工程学报, 2017, 36(S2): 4025-4035.
LI Li1，2，ZHANG Yong1. Experimental research on bump proneness of simulated layered rock specimens. , 2017, 36(S2): 4025-4035.
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2017, Vol. 36 
