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earth-pressure-and-retaining-walls

1. 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?

2. 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`.

3. 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.

4. 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.

5. 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

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Earth pressure and retaining walls

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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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 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.

;

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.

;

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

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