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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 49706 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Khosravi, Ali
- Abstract:
- Results of an advanced suction controlled triaxial test device in an attempt to define the constitutive relationship between suction stress and matric suction (Suction Stress Characteristic Curve, SSCC) for unsaturated sand was presented. The suction stress is a macroscopic stress that incorporates the effects of capillary van der Waals forces cementation, and electrical double-layer repulsion into the definition of effective stress for unsaturated soils. Results of previous studies on silt and clay indicated that variations in the suction stress, during drying path had a non-linear increasing trend with matric suction with greater values upon wetting. However, due to different material properties and inter-particle forces, different variation in this parameter is expected for sand. In the study presented herein, an effort was made to characterize the variation of suction stress for specimens of sand during hydraulic hysteresis and define the relation between the small strain shear modulus (Gmax) and effective stress in term of suction stress. The results of triaxial shear stress tests that indicated a bi-linear shear strength envelope for unsaturated sand used to define the SSCC of the tested material under varying stress state conditions. At low levels of mean net stress, soil failure was observed to diverge from Mohr-Coulomb envelope; an observation which should be taken into consideration when determining the suction stress characteristic curve. Obtained results revealed an analogous trend between experimental results of the Gmax measured from the bender element tests and suction stress of unsaturated sand when plotted in terms of matric suction which means that Gmax of the sand has a direct rerelation with the SSCC of the soil
- Keywords:
- Flow Pump ; Suction Stress ; Triaxial Test ; Shear Test ; Unsaturated Sand ; Hydraulic Hystersis ; Soil-Water Characteristic Curve
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