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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摘要利用分离式霍普金森压杆(split Hopkinson pressure bar，SHPB)对预制裂隙类煤岩组合体进行冲击压缩试验，探究不同裂隙形式组合体的能量演化特征，分析裂隙位置与倾角对组合体破碎分形维数的影响。结果表明：裂隙组合体试件能量耗散与分形特性与裂隙倾角及位置有关。相比完整组合体，裂隙位于煤体或结合面处时，裂隙组合体试件破碎耗能占比与破碎耗能密度偏小，位于岩体中时有所偏大，且各裂隙位置下倾角为30°与60°时对其影响较大，90°时影响较小。裂隙位于岩体中或倾角为90°时，试件分形维数与完整组合体接近，其他裂隙位置或倾角下相差较大。裂隙的存在影响组合体试件的破碎特性，在对复合岩体开挖破碎或支护时，应根据复合岩体的强度与裂隙发育特征，合理布置施工参数，以达到更好的掘进或支护效果。

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	李成杰1
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	张宇婷1
	李海龙1

关键词 ：岩石力学, 煤岩组合体, 预制裂隙, SHPB, 能量耗散, 分形维数

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

引用本文:

李成杰1，徐颖1，2，张宇婷1，李海龙1. 冲击荷载下裂隙类煤岩组合体能量演化与分形特征研究[J]. 岩石力学与工程学报, 2019, 38(11): 2231-2241.
LI Chengjie1，XU Ying1，2，ZHANG Yuting1，LI Hailong1. Study on energy evolution and fractal characteristics of cracked coal-rock-like combined body under impact loading. , 2019, 38(11): 2231-2241.

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

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