Enhancement of a hydro-mechanical hypoplastic model for unsaturated fine-grained soils accounting for small strain stiffness

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10477822" target="_blank" >RIV/00216208:11310/23:10477822 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1051/e3sconf/202338210005" target="_blank" >https://doi.org/10.1051/e3sconf/202338210005</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/e3sconf/202338210005" target="_blank" >10.1051/e3sconf/202338210005</a>

Result language

angličtina

Original language name

Enhancement of a hydro-mechanical hypoplastic model for unsaturated fine-grained soils accounting for small strain stiffness

Original language description

Due to global climate change, larger extreme seasonal and daily moisture variations have been occurring more frequently in the last decades. This phenomenon can affect geotechnical structures by inducing cyclic coupled hydro-mechanical loads. However, reproducing this behaviour from a numerical point of view requires robust constitutive models that can predict the coupling between the hydraulic and mechanical behaviour of fine-grained soils, combined with predictions of history-dependent stiffness evolution at small strains. For this reason, in the present work the hypoplastic model for unsaturated finegrained soils was further modified to better predict the water retention behaviour of unsaturated soils incorporating a smoothed hysteretic Water Retention Curve (WRC). In addition, the constitutive model wascalibrated using experimental data available on the literature of a completely decomposed tuff (CDT) from Hong Kong. At the end, the capabilities of the extended model to predict cyclic behaviour of unsaturated soils were evaluated using cyclic constant water triaxial tests at different suctions The results indicate that the extended model is able to describe with more accuracy the cyclic hydro-mechanical behaviour of the decomposed tuff if additional suction-dependency of one of its small-strain parameters is considered. Without this, the model can be calibrated to data at a given suction but its cyclic predictions for different suctions are not reasonably accurate.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GC21-35764J" target="_blank" >GC21-35764J: Experimental and numerical investigation of coupled thermo-hydro-mechanical behaviour of clay with focus to cyclic processes</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

E3S Web of Conferences

ISBN

—

ISSN

2267-1242

e-ISSN

2267-1242

Number of pages

6

Pages from-to

—

Publisher name

EDP Sciences S A

Place of publication

neuveden

Event location

Milos, Řecko

Event date

May 2, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—