剪切作用下土石混合料的颗粒破碎演化规律

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Abstract Research purposes: Under certain stress conditions, the particles of soil-rock mixture in subgrade fillings of railway, airport, highway will be broken, which leads to the deformation and stability problems of the filling engineering. Most of the existing researches focus on the characteristics of particle breakage after shear failure, but few on the dynamic evolution of particle breakage during the shearing process. Therefore, a large-scale direct shear test machine combined with acoustic emission acquisition system was used to conduct shear tests on soil-rock mixtures with six rock contents and three rock strength under six normal pressures in this paper.
Research conclusions: (1)The relationship between cumulative AE counts and relative breakage index of the failure soil-rock mixture is linear, which proves that it is feasible to use acoustic emission technology in the study of particle breakage evolution of soil-rock mixture. (2)The particle breakage stage during the shearing process can be divided into five typical stages: no breakage stage, initial breakage stage, growth breakage stage, stable breakage stage and residual breakage stage. The corresponding response of stress and strain enters the elastic stage, elastoplastic transition stage, elastic-plastic stage, peak strength stage and plastic failure stage. (3)When the normal pressure is greater, or the rock content is greater, or the rock strength is lower, the duration of the no breakage stage and the residual breakage stage become shorter, and the duration of the initial breakage stage, growth breakage stage, and stable breakage stage get longer. (4)The difference of acoustic emission characteristics between soil-rock mixture and rock mass during shearing process is significant, which is due to the different continuity of material composition. (5)The research results can provide a new idea for the study of particle breakage of soil-rock mixture.

Key words： soil-rock mixture particle breakage rock content direct shear test acoustic emission

Received: 25 June 2021

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TU43

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	TU Yiliang
	LI Jun
	CHAI Hejun
	LIU Xinrong

Cite this article:

TU Yiliang,LI Jun,CHAI Hejun, et al. Evolution of Particle Breakage of Soil-rock Mixture under Shearing[J]. Journal of Railway Engineering Society, 2022, 39(3): 19-25.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I3/19

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