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Particle loss: An initial investigation into size effects and stress-dilatancy

机译：颗粒损失：对尺寸影响和应力膨胀的初步研究

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Drained triaxial tests have been performed to explore the effect of particle loss on shearing behaviour and critical states in granular mixtures. The mixtures comprise Leighton Buzzard sand (d(50) = 0.8 mm), to which was added 15% by mass of salt particles of different nominal sizes: 0.063 mm, 0.25 mm and 0.5 mm. Shearing behaviours before and after particle loss (by dissolution) were compared. A good fit is observed between the test data and a stress-dilatancy relationship for the post-dissolution tests, highlighting the ability of the stress-dilatancy analysis as a means to interpret the effects of particle loss on shearing. It was noted that critical state strength parameter M is determined by the post-dissolution grading regardless of size of removed particle. However, the duration of contractant volumetric strain increased with the larger removed particles (0.25 mm & 0.5 mm) even when initial specific volumes were virtually identical. It is suggested that a loose volumetric state is reached if the sand particle network is initially disrupted by the amount and/or size of salt particles, which following dissolution results in structural or fabric phenomena that are not reflected in scalar volumetric measures such as specific volume. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：已经进行了排水三轴试验，以探索颗粒损失对颗粒混合物中剪切行为和临界状态的影响。混合物包含Leighton Buzzard砂（d（50）= 0.8 mm），向其中添加15质量％的标称尺寸为0.063 mm，0.25 mm和0.5 mm的盐颗粒。比较了颗粒损失（通过溶解）之前和之后的剪切行为。在溶出后测试中，观察到的数据与应力-剪胀率之间的关系非常吻合，突出了应力-剪胀率分析作为解释颗粒损失对剪切作用的一种手段。注意到，临界状态强度参数M由溶解后等级决定，而与去除的颗粒的大小无关。然而，即使初始比容实际上相同，收缩的体积应变的持续时间也会随着较大的去除颗粒（0.25 mm和0.5 mm）而增加。建议如果砂粒网络最初被盐粒的数量和/或大小破坏，则会达到松散的体积状态，溶解后会导致结构或织物现象，这些现象并未在标量体积度量（例如比体积）中得到反映。 。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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