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Page 1: Lateral Earth Pressure - gn.dronacharya.info

Lateral Earth Pressure

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Sheet pile wall

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Types of retaining walls

1. Gravity retaining walls

2. Cantilever retaining walls

3. Counter fort retaining walls.

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Gravity Wall

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Cantilever wall

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Earth Pressure Theories

Rankine Earth Pressure Theory

Coulomb Earth Pressure Theory

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Rankine’s Theory

• Soil mass is semi-infinite, homogeneous, dry and cohesionless

• Friction between the wall and soil is neglected

• Lateral pressure is limited to vertical walls

• Failure along an assumed failure plane defined by φ.

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Rankine’s Theory

Lateral pressure varies linearly with depth

and the resultant pressure is located

one-third of the height (H) above the base of the wall

Resultant force is parallel to the backfill surface

The wall yields about the base sufficiently for the active pressure conditions to develop

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Effect of uniform surcharge on lateral pressure

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Submerged Backfill and Stratified Backfill

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Inclined Surcharge or Sloping Backfill

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Inclined Back of Wall

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Earth Pressure of Cohesive Soil

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Rebhann’s graphical method

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Fig: Culmann’s graphical method for active thrust

Culmann’s graphical method