Analysis dynamic mechanical characteristics and fracture breaking characteristics of coal mine mudstone

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (4) : 137-143.

WANG MengXiang WANG HaiBo ZONG Qi

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Abstract

In order to study the influence of dynamic load on surrounding rock of soft rock roadway in coal mines,a diameter 50 mm separated Hopkinson test device was used to test the dynamic mechanical characteristics and fracture characteristics of common mudstone under impact loading in a coal mine under different impact pressures.Combined with the failure modes of specimens,the dynamic mechanical parameters of specimens under different impact pressures were analyzed.The results of the study show that: the growth rate of stress,strain and the maximum strain of the mudstone increase with the impact pressure; the dynamic uniaxial compressive strength of mudstone show exponential growth with the strain rate,which shows strong strain rate effect; the shale test specimen is in the reflection stress wave and transmission stress; under the combined action of the reflected stress wave and the transmission stress wave,the mudstone specimen produces circumferential failure and axial splitting failure.

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mudstone in mine / SHPB / strain rate / rupture characteristics

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WANG MengXiang WANG HaiBo ZONG Qi . Analysis dynamic mechanical characteristics and fracture breaking characteristics of coal mine mudstone[J]. Journal of Vibration and Shock, 2019, 38(4): 137-143

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