Dynamic mechanical properties of bedding coal and rock impact damage SHPB testing

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (21) : 117-124.

XIE Bei-jing, WANG Xin-yan, LV Ping-yang

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Abstract

In order to study the influence of bedding to dynamic mechanical failure characteristics properties of coal and rock, the experiments that impact the bedding coal samples (vertical bedding and horizontal bedding sampling ) and sandstone samples with good homogeneity were conducted by using the Φ75mm large diameter split Hopkinson pressure bar (SHPB) dynamic load test device, spindle bullet and ultrasonic detector. Experimental results show that: (1) the approximate half sine wave generated by the spindle bullet with a gentle stress wave rising edge feature, which is more suitable for dynamic load test of brittle material of coal rock; (2) ultrasonic vertically through the coal bedding surface will produce serious attenuation effect, leading the ultrasonic velocity of horizontal bedding sampling coal sample is 2 times to the vertical stratification sampling; (3) dynamic load stress-strain curves have great differences between bedding coal and sandstone, and bedding is an important factor to the coal with a long plastic deformation stage and curve of volatility; (4) the dynamic elastic modulus ratio of sandstone is 1 orders of magnitude greater than bedding coal, the bedding has an effect on dynamic mechanical properties of coal and rock impact damage.

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bedding / coal and rock impact damage / dynamic mechanical properties / dynamic elastic modulus

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XIE Bei-jing, WANG Xin-yan, LV Ping-yang. Dynamic mechanical properties of bedding coal and rock impact damage SHPB testing[J]. Journal of Vibration and Shock, 2017, 36(21): 117-124

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