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A creep model of pile-frozen soil interface considering damage effect and ice effect
- Source :
- International Journal of Damage Mechanics. 31:3-21
- Publication Year :
- 2021
- Publisher :
- SAGE Publications, 2021.
-
Abstract
- An important source of time-dependent pile deformation is creep behavior at pile-frozen soil interface in permafrost regions. A creep model for pile-frozen soil/ice interfaces was proposed based on a series of multistage creep tests. The test results show that the creep behavior of the pile-frozen soil/ice interfaces is easily observed at a steady rate larger than 0 even at a small load level, which increases as the increase of load level. The elastic shear modulus increases at a slowing down rate with the increase of load level. The interfaces are mainly strengthened during the creep process until the occurrence of the accelerating creep, which is more obvious for frozen soil. A large amount of ice in frozen soil can enhance the creep rate and reduce the carrying capacity of pile foundation. The viscosity [Formula: see text] reflecting steady creep rate, the instantaneous shear modulus [Formula: see text], and the critical stress [Formula: see text] required for describing damage behaviors distribute in the form of Bigaussian asymmetric peak function with ice content. The Burger model considering ice effect and damage effect is feasible to describe the entire creep behavior of the interfaces. Sensitivity analysis reveals that ice content in frozen soil has a marked influence on pile deformation, a cooling method can probably adjust the creep deformation of pile in frozen soil with high ice content.
- Subjects :
- Materials science
Interface (Java)
Mechanical Engineering
0211 other engineering and technologies
Computational Mechanics
02 engineering and technology
Deformation (meteorology)
Permafrost
Viscosity
020303 mechanical engineering & transports
0203 mechanical engineering
Creep
Mechanics of Materials
General Materials Science
Geotechnical engineering
Pile
021101 geological & geomatics engineering
Subjects
Details
- ISSN :
- 15307921 and 10567895
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- International Journal of Damage Mechanics
- Accession number :
- edsair.doi...........bf2770ff0a4787d165a390e28dbddbf4