Time-effect and instability behaviour of cohesive soils
The stress-strain behaviour of cohesive soils is known to be affected significantly by time-effects such as shearing rate effects, creep and stress relaxation. Shearing rate may affect the shear strength and friction angle of soil. However, the mechanism behind the rate-effects is not well understoo...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2010
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| Online Access: | https://hdl.handle.net/10356/41307 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The stress-strain behaviour of cohesive soils is known to be affected significantly by time-effects such as shearing rate effects, creep and stress relaxation. Shearing rate may affect the shear strength and friction angle of soil. However, the mechanism behind the rate-effects is not well understood. The effect of loading mode, i.e. whether the test is conducted in load-controlled or deformation-controlled loading
mode, has been seldom studied despite the fact that most of the field loading
conditions are load-controlled, whereas the laboratory tests are mainly carried out
using deformation-controlled loading mode. Undrained creep in clay, which is one of
the major time related problems, is often studied in terms of axial strain rate at a
given deviator stress. However, the variation of pore water pressure and effective stresses during undrained creep should be studied as well. Whether the instability will occur at a pre-failure state similar to that observed for sand is not yet known. It should be particularly mentioned that the study of time-effects in triaxial tests on Singapore marine clay has never been reported. |
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