Indexed by:期刊论文

First Author:Li, Wugang

Correspondence Author:Yang, Q (reprint author), Dalian Univ Technol, Inst Geotech Engn, Dalian 116024, Peoples R China.

Co-author:Yang, Qing

Date of Publication:2017-08-01

Journal:BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT

Included Journals:Scopus、SCIE、EI

Document Type:J

Volume:76

Issue:3

Page Number:1075-1084

ISSN No.:1435-9529

Key Words:Unsaturated expansive soils; Constitutive model; Suction; Swelling behaviour; Microstructure; Macrostructure

Abstract:The mechanical behaviour of unsaturated expansive soils is an important factor in the design of barriers for nuclear waste disposal. Double structural constitutive models for expansive soil have been developed based on the distinction between micro-structure and macro-structure of the expansive soil. Nevertheless, the micro-parameters and the coupling function of these models are hard to determine. To eliminate the limitations of these models, the concept of a macro-structural neutral loading line was introduced by adopting a simple assumption concerning the plastic swelling potential of unsaturated expansive soil. A macro-structural volume change equation of unsaturated expansive soil was derived using a macro-structural neutral loading line. The model was based on an existing model for non-expansive unsaturated soils. Only one new macro-parameter was introduced into the constitutive model compared to the original model. Finally, a comparison between predicted results and experimental data indicates that the proposed model has a remarkable ability to reproduce the mechanical and hydraulic responses of unsaturated expansive soils.

Translation or Not:no