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Volume 49, Issue 6 (April 2021)
State-Dependent Behavior of a Crushable Sand in Drained Triaxial Tests
(Received 1 September 2020; accepted 12 January 2021)
Published Online: 15 April 2021
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This article presents a laboratory experimental study on the state-dependent behavior of a crushable sand that was crushed progressively in a number of the drained triaxial tests. The critical state line of sand showed a straight line in the e-logp′ plane, in the e-p′α=0.7 plane and in the q-p′ plane despite of involving the progressive particle breakage. It showed a family of the relations between stress ratio and dilatancy factor rather than a unique stress-dilatancy relation. While increasing the initial void ratio or the initial confining pressure, the peak-state friction and maximum dilatancy angles of sand showed a decrease, but the peak-state basic friction angle of sand increased. Linear representation was revealed for the relations of the maximum dilatancy angle - the peak-state stress ratio and the peak-state basic friction angle - the peak-state stress ratio. An increase in the peak-state state parameter resulted in a linear decrease of the peak-state friction and dilatancy angles of sand, but a linear increase of the peak-state basic friction angle of sand. It revealed a unique linear friction-dilatancy relation of sand incorporating the progressive particle breakage. The peak-state volumetric strain and deviator strain of sand increased while increasing the initial void ratio or the initial confining pressure or the peak-state state parameter, but decreased with increasing the peak-state stress ratio. The peak-state dilatancy factor d incorporating the progressive particle breakage decreased linearly with increasing the peak-state stress ratio, but linearly increased along the increase of the peak-state state parameter. Dilatancy of sand should be dependence of the pressure and density of sand as well as the progressive particle breakage.
Institute of Mountain Hazards and Environment, Chinese Academy of SciencesCenter for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of SciencesChina-Pakistan Joint Research Center on Earth SciencesUniversity of Chinese Academy of SciencesDepartment of Civil Engineering, The University of Tokyo, ChengduBeijingIslamabadBeijingTokyo,
Stock #: JTE20200546
Title State-Dependent Behavior of a Crushable Sand in Drained Triaxial Tests