A water retention model for compacted bentonites
A water retention model for compacted bentonites
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DOI：
10.1139/cgj-2016-0297
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发表时间：
2017-01
影响因子：
3.6
通讯作者：
A. Dieudonné;G. D. Vecchia;R. Charlier
中科院分区：
文献类型：
--
作者：
A. Dieudonné;G. D. Vecchia;R. Charlier
压实膨润土的保水性能受到这些材料中发生的多物理和多尺度过程的强烈影响。实验数据证明了材料干密度、施加的体积约束和土壤结构的主要影响。本文提出了一个新的保水模型，该模型考虑了压实膨润土各结构层次的保水机理，即集料内孔隙的吸附和集料间孔隙的毛细作用。根据不同膨润土基材料的实验数据对该模型进行了校准和验证，表明该模型具有很好的捕捉行为主要特征的能力。该模型能够在一个统一的框架内，使用有限数量的参数，在广泛的吸力范围内重现压实膨润土的实验数据。所介绍的一些参数对几种膨润土具有大致相同的取值，为初步研究膨润土的性能提供了重要依据。
The water retention behaviour of compacted bentonites is strongly affected by multi-physical and multi-scale processes taking place in these materials. Experimental data have evidenced major effects of the material dry density, the imposed volume constraints, and the soil fabric. This paper presents a new water retention model accounting for proper retention mechanisms in each structural level of compacted bentonites, namely adsorption in the intra-aggregate pores and capillarity in the inter-aggregate ones. The model is calibrated and validated against experimental data on different bentonite-based materials, showing good capabilities in capturing the main features of the behaviour. The model is able to reproduce experimental data on compacted bentonites over a wide range of suction values, within a unified framework, and using a limited number of parameters. Some of the parameters introduced are shown to take approximately the same value for several bentonites, providing a significant basis for prelimin...