Nonlinear Creep and Swelling Behavior of Bentonite Mixed with Different Sand Contents Under Oedometric Condition |
| |
| Authors: | Fei Tong |
| |
| Institution: | Department of Civil and Structural Engineering , The Hong Kong Polytechnic University, Hung Hom , Kowloon , Hong Kong , China |
| |
| Abstract: | Due to the viscous nature, especially the swelling property, bentonite is selected as buffer and backfill material for marine radioactive waste disposal. This article presents experimental results from one-dimensional oedometric compression tests with multi-stage loading and unloading/reloading on specimens of bentonite mixed with different sand contents. The sand contents are 50%, 60%, 70%, 80%, and 90%, respectively, in terms of the dry mass of sand over the dry mass of the mixture. Influences of sand contents on time-dependent stress-strain behavior of the bentonite-sand mixture under 1-D straining are examined with special attention to the nonlinear creep and swelling behavior. It is found that the bentonite-sand mixtures exhibit distinct nonlinear creep and swelling behavior that cannot be neglected. Moreover, a nonlinear creep function proposed by Yin (1999
Yin , J.-H. 1999 . Non-linear creep of soils in oedometer tests . Geotechnique 49 ( 5 ): 699 – 707 .Crossref], Web of Science ®] , Google Scholar]) for Hong Kong Marine Deposits has been modified to describe the nonlinear creep behavior of the bentonite-sand mixture. |
| |
| Keywords: | bentonite creep oedometer sand stress-strain swelling time-dependent |
|
|
