冲击荷载下裂隙类煤岩组合体能量演化与分形特征研究

doi:10.13722/j.cnki.jrme.2019.0446

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Abstract The uniaxial impact compression tests of coal-rock-like combined body with pre-existing cracks are carried out by using split Hopkinson pressure bar(SHPB). The energy evolution characteristics with different pre-existing cracks are investigated，and the influence of the position and dip angle of cracks on the fractal dimension of the combined body is analyzed. The results show that the energy dissipation and fractal characteristics of the cracked combined body are affected by the dip angle and location of cracks. The energy dissipation ratio and the energy dissipation density of the combined body with cracks in coal body or joint surface are smaller than those in the intact combined body，while the combined body with cracks in rock does the opposite. The dip angle of 30° or 60° has a greater influence on the energy dissipation ratio and the energy dissipation density than 90°. The fractal dimensions of cracked combined bodies in the case of cracks locating at rock or the dip angle of cracks equal to 90° are close to those of intact combined bodies or a large difference occurs. It is suggested that the construction parameters should be arranged reasonably according to the strength of the combined body and the distribution of cracks to achieve a better effect during excavation and reinforcement.

Key words： rock mechanics coal-rock combined body pre-existing cracks SHPB energy dissipation fractal dimension

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	LI Chengjie1
	XU Ying1
	2
	ZHANG Yuting1
	LI Hailong1

Cite this article:

LI Chengjie1,XU Ying1,2, et al. Study on energy evolution and fractal characteristics of cracked coal-rock-like combined body under impact loading[J]. , 2019, 38(11): 2231-2241.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0446 OR http://www.rockmech.org/EN/Y2019/V38/I11/2231

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