Influence of sand content on the non-linear creep and swelling behavior of bentonite in oedometric condition

Fei Tong, Jianhua Yin

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

The time-dependent feature of clayey soils has gained concern worldwide. Due to its highly absorbent nature, the bentonite obviously demonstrates both creep and swelling phenomena. This paper presents experimental results from one-dimensional oedometer consolidation tests on undisturbed sand mixed bentonite (SMB) specimens. These specimens had sand proportion of 50%, 60% and 70%, respectively. Multistage oedometer tests with loading, unloading and reloading were done on these specimens with a long duration in order to investigate the time-dependent creep and swelling behavior. The prime objective of this paper is to examine the influence of the sand content on the time-dependent creep and swelling behavior of the SMB under 1-D consolidation and to gain a better understanding of the behavior of the natural undisturbed bentonite. In the 1-D creep and swelling tests, the non-linear creep behavior as well as the swelling behavior has been investigated. Distinct non-linear creep behavior has been observed for the undisturbed SMB during the oedometer tests. Results and related analysis are presented in this paper. The ratio of secondary compression index over compression index, C α/C c, is found to vary with vertical effective stresses and time. Moreover, sand content exerts an indispensible impact on creep behavior. Finally, the non-linear creep function proposed by Yin (1999) originally for the remoulded HKMD has been adopted and modified to simulate the non-linear creep behavior of the SMB. Influences of sand content on parameters in an Elastic Visco-Plastic (EVP) model are also investigated. The EVP model is used to simulate the time-dependent behavior. It is found that the modeling results are in excellent agreement with data of tests on SMB.
Original languageEnglish
Title of host publication14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering
Publication statusPublished - 1 Dec 2011
Event14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2011 - Hong Kong, Hong Kong
Duration: 23 May 201127 May 2011

Conference

Conference14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2011
CountryHong Kong
CityHong Kong
Period23/05/1127/05/11

ASJC Scopus subject areas

  • Soil Science
  • Geotechnical Engineering and Engineering Geology

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