Computer · Soil Mechanics - Lateral Earth Pressure
For a retaining wall supporting a backfill of normally consolidated clay subjected to a slow (drained) rotation away from the backfill, how does the required wall strain (Δa / H) for full active stress mobilization compare to the strain required for a similar wall supporting dense sand?
- 1The required strain (Δa / H) for normally consolidated clay is smaller than for dense sand, due to the clay's lower compressibility.
- 2Normally consolidated clay does not develop an active state; it only experiences hydrostatic pressure, making the comparison irrelevant.
- 3The required strain (Δa / H) is approximately the same for both, as the active state is solely determined by the angle of internal friction, which is similar for both materials in a drained condition.
- 4The required strain (Δa / H) for normally consolidated clay is larger than for dense sand, because soft clay exhibits high compressibility and requires more displacement to reach the plastic failure state.✓
Correct answer
The required strain (Δa / H) for normally consolidated clay is larger than for dense sand, because soft clay exhibits high compressibility and requires more displacement to reach the plastic failure state.
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