Question Bank of Geotechnical Engineering (Slope Stability)
1. What is slide ?
- The failure of a mass of soil located beneath a slope is called a slide.
2. The causes for failure of slope.
- The action of gravitational forces, and
- Seepage forces within the soil.
- Failure due to undercutting of its foot.
- Failure due to disintegration
- n of the structure of the soil.
3. The types of slope.
Infinite slope
- If a slope represents the boundary surface of a semi-infinite soil mass, and the soil properties for all identical depths below the surface are constant, it is called an infinite slope.
Finite slope
- If a slope is of limited extent, it is called finite slope.
4. Basic types of failure of a finite slope.
- Slope failure
- Base failure
5. The types of slip surfaces or failure surfaces
- Planner failure surface
- Circular failure surface
- Non- circular failure surface
6. The method of analysis for stability of a finite slope
- Culmann's method of planner failure surface
- The Swedish circle method or Slip circle method
- The friction circle method
- Bishop's method
7. Controlling measures for slope protection.
The controlling measures for the protection of slope can be taken by
- Providing retaining wall on the side of filing
- Providing good base course for the soil.
- Making top surface as hard layer.
8. What is slope failure ?
- If the failure occurs along a surface of sliding that intersects the slope at or above its toe, the slide is known as slope failure.
9. What is face failure ?
- If the arc passes above the toe is called face failure.
10. What is toe failure ?
- If the arc passes through the toe is called toe failure.
11. What is base ?
- If the soil beneath the toe of the slope is weak the failure occurs along a surface passes at someone distance below the toe of the slope. Such type of failure is called base failure.
12. Under what circumstances planar failure will occur?
- Planar failure surface may commonly occur in a soil deposit or embankment with a specific plane of weakness. Excavation in stratified deposit quite often leads to a planar failure surface along a plane parallel to the strata.
13. How the stability of slope of an earthen dam will you analyze?
- Stability of downstream slope during steady seepage.
- Stability of upstream slope during sudden drawdown.
- Stability of upstream and downstream slopes during and immediately after the construction.
14. Forces acting on the sliding wedge in the friction circle method.
- The weight of the wedge
- The total frictional resistance
- Total cohesive resistance
15. Factor of safety used in stability Analysis of slopes with respect ?
- To cohesion assuming to be fully mobilized.
- To friction assuming to be fully mobilized.
- To shear strength
- To height.
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