节理粗糙度及吻合状态对岩体动态压缩特性影响的试验研究

doi:10.13722/j.cnki.jrme.2020.0820

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Abstract The surface roughness and matching state of joints have an important influence on the dynamic mechanical properties of rock masses. This paper used cement mortar materials to make fully-matched and mismatched jointed samples with different roughness，and carried out impact tests on the samples by using the split Hopkinson pressure bar system(SHPB). At the same time，a high-speed camera and the digital image correlation method were used to explore the dynamic failure process of rock masses. The results show that，under a given impact load，the jointed roughness has little effect on the dynamic compressive strength and the average modulus of the fully-matched jointed rock-like specimens but has a greater influence on the mismatched jointed rock-like specimens. Mismatched joints exhibit nonlinear closure characteristics under stress wave，which is not only affected by the joint roughness but also related to joint specific morphological characteristics. With increasing the joint roughness，the ability of the stress wave to through the mismatched jointed rock mass increases，while the fully-matched jointed rock mass showed little effect. The failure of jointed rock mass is related to the irregular bulge of the joint surface. Specifically，The interaction between the stress waves and the bulge on the joint walls leads to the stress concentration in the vicinity of the bulge. The dramatical tensile stress initiates cracks，then these cracks develop，and splitting failure occurred.

Key words： rock mechanics joint roughness matching state dynamic compressive closure failure process SHPB

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	YAN Yatao1
	2
	LI Jianchun1
	2

Cite this article:

YAN Yatao1,2,LI Jianchun1, et al. Experimental study on the influence of joint roughness and matching state on dynamic compression characteristics of rock masses[J]. , 2021, 40(6): 1132-1144.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0820 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I6/1132

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