颗粒形状和中主应力对砂土力学特性耦合影响的真三轴试验研究

doi:10.13722/j.cnki.jrme.2022.0721

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Abstract Sand grains are under three-dimensional stress condition in natural state. Particle shape varies due to complex physical and sedimentation process，further affecting the contact mode under loading. The macroscopic mechanical properties of sand are influenced by microscopic particle shape. This study carries out true triaxial tests on mixture of silica sand and round(crushed) glass beads，examines the effect of particle shape on the mechanical properties of sand under three-dimensional stress condition. In combination of dynamic particle image analysis technique to quantitatively analyze the particle shape，the varying tendency of particle shape parameters with glass beads content is acquired. The coupled effect mechanisms between the intermediate principal stress and particle shape on the macroscopic mechanical response are investigated. The test results show that the glass beads-silica sand mixture with regular particle shape effectively suppresses the dilation characteristics of the mixture. For a given medium principal stress level，the peak friction angle of the glass beads-silica sand mixture increases with increasing particle shape irregularity，and the large principal strain corresponding to the peak strength decreases with increasing particle shape irregularity. In this experimental study，the varying tendency in peak strength of glass beads-silica sand mixture accompanied by the variation in the intermediate principal stress can be well predicted by the classical failure criterion.

Key words： soil mechanics intermediate stress ratio coefficient true triaxial test particle shape peak friction angle failure criterion

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	Articles by authors
	WU Yang1
	RONG Haojun1
	WANG Jinlian2
	LI Neng1
	WU Yihang1
	CUI Jie1

Cite this article:

WU Yang1,RONG Haojun1,WANG Jinlian2, et al. A true triaxial experimental study on the coupled effect of particle shape and intermediate principal stress on the mechanical properties of sand [J]. , 2023, 42(2): 497-507.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0721 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I2/497

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