层状复合岩体冲击动力学特性试验研究

doi:10.13722/j.cnki.jrme.2019.0021

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Abstract In order to explore the dynamic mechanical properties of layered composite rocks which are common in rock engineering，layered composite rock samples spliced by red and gray sandstones were prepared. Impact compression tests in two cases of gray sandstone and red sandstone near the incident bar at different impact velocities were carried out using split Hopkinson pressure bar(SHPB) test system，and the stress wave propagation characteristics，dynamic stress-strain relationship and energy dissipation law of composite rock mass in two cases were studied and compared. The stress characteristics and strength conditions of composite rock mass were analyzed theoretically，and the failure characteristics of composite rock mass were studied by using ultra-high speed digital image correlation(DIC) test system. The results show that the dynamic mechanical properties and energy dissipation laws of composite rock mass have obvious strain rate effect. At the same impact velocity， the dynamic characteristics of composite rock mass in the case of the stress wave propagating from the hard to the soft are obviously different from those in the case of the stress wave propagating from the soft to the hard due to the matching relationship of the wave impedance. However，the difference gradually decreases and tends to be zero with increasing the impact velocity. It is also shown that the failure degree and failure form of the two parts of composite rock are obviously different. The damage degree of the red sandstone with relatively small wave impedance is more severe than that of the gray sandstone. The red sandstone mainly shows shear failure，and the failure of the part at the boundary layer legs other regions. For the gray sandstone，tensile failure is dominant and local shear failure occurs at a high impact velocity，and the part at the boundary layer fails earlier than other regions.

Key words： rock mechanics layered composite rock SHPB DIC wave impedance stress wave energy dissipation

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	Articles by authors
	YANG Renshu1
	2
	LI Weiyu1
	3
	FANG Shizheng1
	3
	ZHU Ye1
	3
	LI Yongliang1
	3

Cite this article:

YANG Renshu1,2,LI Weiyu1, et al. Experimental study on impact dynamic characteristics of layered composite rocks[J]. , 2019, 38(9): 1747-1757.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0021 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I9/1747

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