Generalized hydro-mechanically coupled hypoplastic constitutive model for unsaturated collapsible soils

IF 3 3区工程技术 Q2 ENGINEERING, GEOLOGICAL

Canadian Geotechnical Journal Pub Date : 2023-10-27 DOI:10.1139/cgj-2022-0633

Merita Tafili, Jan Machacek

引用次数: 0

Abstract

In this paper, a generalized hypoplastic constitutive model for unsaturated soils based on the work of Fuentes and Triantafyllidis [2013] is presented. The constitutive model is formulated in terms of eﬀective stresses, degree of saturation and suction. The main feature of the model is a Limiting Surface (LS) which describes the maximum achievable void ratio as a function of mean eﬀective stress and degree of saturation. The LS allows to capture the wetting-induced collapse of initially unsaturated soils. The performance of the proposed model is demonstrated by backcalculation of a well-documented experimental study on over 30 samples of compacted Pearl clay by Sun et al. [2004] under isotropic as well as triaxial loading conditions. For this purpose, the proposed model is coupled with a hypoplastic model for the soil-water retention curve, which interrelates the eﬀective degree of saturation with the suction and the void ratio.

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非饱和湿陷性土广义水-力耦合欠塑性本构模型

本文基于Fuentes和Triantafyllidis[2013]的工作，提出了非饱和土的广义欠塑性本构模型。根据有效应力、饱和程度和吸力建立了本构模型。该模型的主要特征是一个极限面(LS)，它描述了可实现的最大孔隙比作为平均有效应力和饱和度的函数。LS允许捕获湿润引起的最初非饱和土壤的崩溃。Sun等人[2004]在各向同性和三轴加载条件下对30多个珍珠粘土压实样品进行了实验研究，并通过反计算证明了所提出模型的性能。为此，提出的模型与土-水保持曲线的欠塑性模型相耦合，该模型将有效饱和度与吸力和孔隙率相互关联。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Canadian Geotechnical Journal 地学-地球科学综合

CiteScore

7.20

自引率

5.60%

发文量

163

审稿时长

7.5 months

期刊介绍： The Canadian Geotechnical Journal features articles, notes, reviews, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Contributions that have practical relevance are preferred, including case records. Purely theoretical contributions are not generally published unless they are on a topic of special interest (like unsaturated soil mechanics or cold regions geotechnics) or they have direct practical value.