Modeling for critical state line of granular soil with evolution of grain size distribution due to particle breakage
Modeling for critical state line of granular soil with evolution of grain size distribution due to particle breakage
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DOI：
10.1016/j.gsf.2019.06.008
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发表时间：
2020-03
影响因子：
8.9
通讯作者：
Ching S. Chang;Yibing Deng
中科院分区：
文献类型：
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作者：
Ching S. Chang;Yibing Deng
临界状态线（CSL）的确定对于表征颗粒土的工程性质具有重要意义。粒径分布（GSD）对CSL的位置有显著影响。颗粒破碎对CSL的影响主要是由于颗粒破碎导致GSD的变化。然而，在考虑颗粒破碎影响的CSL模型中，GSD并没有得到很好的考虑。本研究旨在建立一个考虑GSD影响的CSL定量模型。我们假设临界态孔隙比相对于GSD的变化与影响最小孔隙比相对于GSD变化的机制相同。因此，将Chang等人（2017）提出的最小空隙比粒子堆积模型扩展到预测临界状态空隙比。通过对几种颗粒材料的CSLs试验结果验证了所建立的模型。然后将颗粒破碎引起的GSD演化纳入模型。通过对堆石料的试验结果对模型进行了进一步的评价，说明了该模型在预测颗粒破碎的颗粒状材料CSL时的适用性。
Determination of the critical state line (CSL) is important to characterize engineering properties of granular soils. Grain size distribution (GSD) has a significant influence on the location of CSL. The influence of particle breakage on the CSL is mainly attributed to the change in GSD due to particle breakage. However, GSD has not been properly considered in modeling the CSL with influence of particle breakage. This study aims to propose a quantitative model to determine the CSL considering the effect of GSD. We hypothesize that the change of critical state void ratio with respect to GSD is caused by the same mechanism that influences of the change of minimum void ratio with respect to GSD. Consequently, the particle packing model for minimum void ratio proposed by Chang et al. (2017) is extended to predict critical state void ratio. The developed model is validated by experimental results of CSLs for several types of granular materials. Then the evolution of GSD due to particle breakage is incorporated into the model. The model is further evaluated using the experimental results on rockfill material, which illustrates the applicability of the model in predicting CSL for granular material with particle breakage.