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earth-pressure-and-retaining-walls

1. A retaining wall 4m high has a smooth vertical back. The backfill has a horizontal surface in level with top of wall. There is a uniformly distributed surcharge load of intensity 36 KN/`m^3` over backfill. The unit weight of backfill is 18 KN/`m^3` and angle of shearing resistance is `30^0` and cohesion is zero. Determine magnitude and point of application of active pressure per metre length of wall.

2. A vertical excavation was made in a clay deposit having weight of 20 KN/`m^3`. It caved in after depth of digging reached 4m. Taking angle of internal friction to be zero, calculate value of cohesion. If same clay is used as a backfill against a retaining wall upto a height of 8m, Calculate:
  • total active earth pressure
  • total passive earth pressure

3. In above problem, if water table rises behind wall to an elevation of 1.5 m below top, determine total active pressure and ots point of application. Take submerged weight of sand as 12 KN/`m^3`. Assume that re is no change in angle of shearing resistance due to submergence.

4. Compute intensities of active and passive earth pressure at a depth of 8 m in dry cohesionless sand with an angle of friction of `30^0` and unit weight of 18 KN/`m^3`. What will be intensities of active and passive earth pressure if water level rises to ground level? Take saturated unit weight of sand as 22 KN/`m^3`.

5. A rigid retaining wall 6m high is restrained from yielding. The backfill consists of cohesionless soil having `phi=26^0` and `gamma=19 (KN)/m^3`. Compute total earth pressure per metre length of wall?

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Earth pressure and retaining walls

A retaining wall 4m high has a smooth vertical back. The backfill has a horizontal surface in level with top of wall. There is a uniformly distributed surcharge load of intensity 36 KN/`m^3` over backfill. The unit weight of backfill is 18 KN/`m^3` and angle of shearing resistance is `30^0` and cohesion is zero. Determine magnitude and point of application of active pressure per metre length of wall.

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A vertical excavation was made in a clay deposit having weight of 20 KN/`m^3`. It caved in after depth of digging reached 4m. Taking angle of internal friction to be zero, calculate value of cohesion. If same clay is used as a backfill against a retaining wall upto a height of 8m, Calculate:
  • total active earth pressure
  • total passive earth pressure

;

In above problem, if water table rises behind wall to an elevation of 1.5 m below top, determine total active pressure and ots point of application. Take submerged weight of sand as 12 KN/`m^3`. Assume that re is no change in angle of shearing resistance due to submergence.

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Compute intensities of active and passive earth pressure at a depth of 8 m in dry cohesionless sand with an angle of friction of `30^0` and unit weight of 18 KN/`m^3`. What will be intensities of active and passive earth pressure if water level rises to ground level? Take saturated unit weight of sand as 22 KN/`m^3`.

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A rigid retaining wall 6m high is restrained from yielding. The backfill consists of cohesionless soil having `phi=26^0` and `gamma=19 (KN)/m^3`. Compute total earth pressure per metre length of wall?

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