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Centrifuge Modeling of Slope Instability
1-The centrifuge tests were useful in simulating slope instability.
2-The instability of slopes during rainfall was due to a loss of matric suction that is equivalent to reduction in apparent cohesion.
3- The strength of unsaturated soils under plane strain and triaxial compression was well expressed using an extended Mohr-Coulomb failure criteria.
4-The centrifuge test generated threshold curves of rainfall intensity versus duration, close to the reported global threshold relationships
- Creativity or interesting
B- Experiment skill
C- Elaborate work
The failure surface along the middle of the cross section was carefully traced onto a piece of transparent sheet and then digitized.
plane strain compressions
E- Related to our work
F- Something that might be innovative me
- However, a proper soil characterization is very difficult in view of the inhomogeneous and variable soil properties. Thus, the use of numerical models in routine prediction of rainfall-induced slope failure has not been very popular.
- Some researchers noticed that the moisture content of the slopes was an important factor related to slope failures or debris flows.
- A series of centrifugal tests were conducted on steep slopes of three different angles (90, 75, and 60°) and heights (10, 15, and20 cm), and of soils having three different properties.
- The coefficients of hydraulic conductivity of the pure sand, sand with 15% clay, and sand with 30% clay were determined as 3.8*10−3 cm/ s, 1.8*10−5 cm/ s, and 1.8*10−7 cm/ s, respectively.
- The triaxial and plane strain compression tests were conducted on these three types of soil prepared under conditions identical to the slope model and tested.
- It is of interest to note that the apparent cohesion obtained for the triaxial and plane strain conditions are approximately the same.
- The angles of internal friction under plane strain conditions were higher than corresponding triaxial conditions by 1° to 3° for the three types of soil. The observation was consistent with the behavior of sands, such as that of Toyoura sand (Tatsuoka et al. 1986).
- smeared with grease along the two side walls, in order to minimize the wall friction with the soil.
- The accelerations acting on the top and bottom of the slope were slightly different, and the reported acceleration acting in the slope was based on the base of platform. Practically, the acceleration varies across the height of slope, thus, the effect would be minimized in the case of a large centrifuge that has a long arm.
- Note that the value did not represent the true values during testing, but it gave an indication of the distribution of moisture during rainfall tests. There is a clear difference in the degree of saturation for the two groups of tests, which were conducted under different accelerations and, thus, rainfall intensity and duration until failure.