层理对煤岩动态断裂及能量耗散规律影响的试验研究

doi:10.13722/j.cnki.jrme.2017.0630

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Abstract

In order to study the influence of bedding angle and loading rate on the fracture toughness and energy dissipation of coal，notched semi-circular bending(NSCB) specimens were tested by using a split Hopkinson pressure bar(SHPB) system. The dynamic fracture toughness of coal specimens with various bedding angles under different loading rates were analyzed and discussed. By comparing the incident energy，absorbed energy，fracture energy and residual kinetic energy of coal samples with different bedding angles under various impact velocities，the energy dissipation law of the dynamic fracture process of coal considering the bedding direction effect is obtained. The experimental results indicate that the fracture pattern of NSCB coal samples is tensile failure and the two pieces of the broken coal sample rotate at a constant speed. The dynamic fracture toughness of coal sample is 3.52–8.64 times of the quasi-static fracture toughness. The dynamic fracture toughness increases with the increase of impact velocity，but the effect of bedding angle on dynamic fracture toughness decreases with the increase of impact velocity. The dynamic fracture energy of coal samples increases with the increase of impact velocity，but the energy utilization ratio decreases with the increase of impact velocity.

Key words： mining engineering coal notched semi-circular bending fracture toughness bedding angle energy dissipation

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	GONG Shuang1
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	ZHAO Yixin1
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Cite this article:

GONG Shuang1,2,ZHAO Yixin1, et al. Effects of bedding on fracture characteristics and energy dissipation of coal under impact loading[J]. , 2017, 36(S2): 3723-3731.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0630 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/3723

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