Changes to particle characteristics associated with the compression of sands
Changes to particle characteristics associated with the compression of sands
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DOI：
10.1680/geot.9.p.114
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发表时间：
2011-06-01
期刊：
影响因子：
5.8
通讯作者：
Coop, M. R.
中科院分区：
文献类型：
--
作者：
Altuhafi, F. N.;Coop, M. R.
人们普遍认为，在压缩过程中，砂中颗粒破碎的开始标志着屈服的开始。虽然颗粒破碎与单个土颗粒的抗拉强度密切相关，但初始密度和初始试样级配对颗粒破碎概率有很大影响。本文探讨了初始级配和密度的影响，在一维压缩过程中的样品行为的三个砂不同的矿物。结果发现，一个独特的正常压缩线是一个很大的量的破碎差分级样品的结果，并通过改变初始分级到一个更好的分级样品的颗粒破碎显着减少观察，直到非常良好的分级样品没有显着的颗粒破碎可以测量。在这一点上，发现难以定义样品的唯一正常压缩线，并确定了过渡行为。除了颗粒大小，本文探讨了一些重要的颗粒特性，如颗粒形状和颗粒表面粗糙度的变化，试图在屈服过程中的微观颗粒损伤的性质与土壤的行为。
It is commonly accepted that the onset of particle breakage in sands during compression marks the start of yielding. Although particle breakage is strongly associated with the tensile strength of a single soil grain, initial density and initial sample grading have great influence on the probability of particle breakage. This paper examines the effect of initial grading and density on the sample behaviour during one-dimensional compression for three sands with distinct mineralogies. It was found that a unique normal compression line is the outcome of a large amount of breakage in poorly graded samples and that by changing the initial grading to a better graded sample a significant reduction in particle breakage is observed, until for very well-graded samples no significant particle breakage can be measured. At this point a difficulty in defining a unique normal compression line for the sample was found and a transitional behaviour was identified. In addition to particle size, the paper examines the changes to some important particle characteristics such as particle shape and particle surface roughness in an attempt to relate the soil behaviour to the nature of the microscopic particle damage during yielding.