Creep Characteristics Considering Stress Paths of Dredger Fill
Yang Aiwu and Zhang Yan
DOI:10.11835/j.issn.1674-4764.2014.03.005
Received December 21, 2013,Revised , Accepted , Available online July 01, 2015
Volume ,2014,Pages 24-29
- Abstract
To study the influence of stress path on the long-term deformation, creep tests of dredger fill in Tianjin Binhai New Area in three different stress paths, namely decrease p paths (DEP)、constant p paths (CNP) and increase p paths (INP) respenctively, were carried out by using the WF stress paths tester and grading loading method. The results showed that under the same deviate stress conditions, the creep strain decreased in three kinds of stress paths of DEP, INP and CNP in turn, deformation rate of stable stage in the procession of creep increased according to the three kinds of stress paths of DEP, CNP, INP. The pore water pressure were negative in the procession of creep with decrease p and constant p stress paths, and decreased along with the deviate stress increase. However, in the procession of creep with increase p stress paths , the pore water pressure increased with the increase of deviator stress. The long-term strength in decrease p and constant p stress paths was higher than that in increase p stress paths. Finally, the effect is better by using quadratic polynomial to fit stress-strain isochronous curve of the three stress paths.