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Characterization of mechanisms contributing to distribution of yield stress in a soil profile (on the basis on Jamiolkowski et al_ (1985))_
| Category | Description | Stress History Profile |
|---|---|---|
| A) Mechanical One-Dimensional | 1) Changes in total vertical stress (overburden, glaciers, etc.) | Uniform with constant s’p-s’v0 (except with seepage) |
| B) Desiccation | 1) Drying due to evaporation vegetation, etc. | Often highly erratic |
| C) Drained Creep (Aging) | 1) Long-term secondary compression | Uniform with constant s’p/s’v0 |
| D) Physicochemical | 1) Natural cementation due to carbonates, silica, etc. | Not uniform |
Examples of methods for determination of preconsolidation stress_
| METHOD | PROCEDURE | HORIZONTAL AXIS | VERTICAL AXIS |
|---|---|---|---|
| Casagrande (1936) | Graphical | log s’ | e |
| Van Zelst (1948) | Graphical | log s’ | e |
| Burmister (1951) | Graphical | log s’ | e |
| Schmertmann (1955) | Graphical | log s’ | e |
| Pacheco Silva (1970) | Graphical | log s’ | e |
| Sällfors (1975) | Graphical | logs’ | e |
| Becker et al. (1987) | Graphical | s’ | W-Energy Work |
| Jose et al. (1989) | Graphical | log s’ | loge |
| Şenol, Seglamer (2000) | Graphical | log s’ | s’e |
| Janbu (1969) | Direct | s’ | e,M |
| Janbu, Senneset (1979) | Direct | s’ | e, M,Cv |
| Tavenas et al. (1979) | Direct | s’ | s’∙e |
| Butterfield (1979) | Direct | log p’ | lnV = [ln(1+e)] |