Exponential Equation for Predicting Shear Strength Envelope of Unsaturated Soils
| Autor: | Reza Ahmadi Naghadeh, Nabi Kartal Toker |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Consolidation (soil) Capillary action 010102 general mathematics Isotropy 0211 other engineering and technologies Soil Science 02 engineering and technology Physics::Classical Physics 01 natural sciences Physics::Geophysics Exponential function Physics::Fluid Dynamics Nonlinear system Soil water Cohesion (geology) Geotechnical engineering 0101 mathematics Water content 021101 geological & geomatics engineering |
| Zdroj: | International Journal of Geomechanics. 19 |
| ISSN: | 1943-5622 1532-3641 |
| Popis: | An exponential equation is introduced to predict the nonlinear variation of the shear strength with matric suction of the unsaturated soils. The proposed equation involves three constant parameters, two of which are effective shear strength parameters (i.e. ϕ´ and c´). The third parameter is the maximum capillary cohesion,c´´max, that is the maximum possible increase in shear strength due to matric suction. A procedure for determination of c´´max from the soil-water characteristic curve (SWCC) is devised. The proposed equation is validated through a series of constant-suction consolidated drained triaxial tests conducted on specimens reconstituted by isotropic consolidation from slurry state. In addition, validity of the equation is investigated by applying it to test results of five other soils that were available in the literature for low suction range (i.e. up to 1500 kPa). A comparative study on prediction of shear strength was carried out between the proposed equation and six other shear strength equations found in the literature. The results show that the proposed equation provides reliable predictions of shear strength of unsaturated soils when shear strength converges to an asymptotic value at the residual water content. |
| Databáze: | OpenAIRE |
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