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Evaluation of the Steady State and Liquefaction Potential of Gravelly Soils By Static Triaxial Tests
Payan, Meghdad | 2012
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 43293 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Haeri, Mohsen
- Abstract:
- Gravelly soils are among the ones that can be found all over the world and have been investigated by many researchers in recent years. Although many investigations have been performed to clarify the behaviour of these soils, but still there are a lot of shortge of information about the steady state and liquefaction potential of them. In this research, to verify the behaviour of gravelly soils, static triaxial apparatus has been used. The tests performed in this research are devided into 2 groups: Consolidated Undrained tests (CU) and Consolidated Drainedtests(CD). In group 1 tests, all 4 parameters involving gradation, relative density, isotropic pressure and anisotropy of consolidation change in various tests and their effects on the steady state condition of soil are investigated. From the results of these tests, we conclude that with the increase of isotropic pressure, soil strength increase percent in the result of relative density increase, will decrease. Also, with the increase of anisotropy of consolidation, the effect of relative density on steady state strength and excess pore water pressure will decrease. Another important result that can be obtained from these tests is that gravel percent decrease, isotropic pressure decrease and initial relative density increase will causeinitial shear stress (α)to be proportional to steady state strength, that is, with the increase of α , steady state strength will also increase and vice versa. In group 2 tests, to evaluate the membrane penetration effect on the soil behaviour, a sand cover is used and 3 parameters involving gradation, isotropic pressure and anisotropy of consolidation change in various tests and each test is performed in 2 ways: with and without sand cover to study the effect of membrane penetration. From the reults of these tests, we conclude that with the increase of initial shear stress (α), the ultimate strength of specimen with membrane penetration will increase compared to specimen without membrane penetration. Also increase of gravel percent has no effect on the strength of specimens with and without membrane penetration effectcompared to eachother.
- Keywords:
- Gravely Sand ; Steady State ; Static Triaxial Test ; Monotonic Test ; Liquefaction
- محتواي پايان نامه
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