Lecture 7 - Lateral Earth Pressure
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Transcript of Lecture 7 - Lateral Earth Pressure
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LATERAL EARTH PRESSURE
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EARTH PRESSURE TYPES
At-rest (Po & Ko)
Active (Pa & Ka)
Passive (Pp & Kp)
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At-Rest Pressure
The retaining wall is not
allowed to move away or toward the retained soil.
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At-Rest Pressure
The retaining wall is not
allowed to move away or toward the retained soil.
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Active Earth Pressure
The retaining wall is
allowed to move away from the retained soil.
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Active Earth Pressure
The retaining wall is
allowed to move away from the retained soil.
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Active Earth Pressure (Rankine Theory) The retaining wall is
allowed to move away from the retained soil.
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Active Earth Pressure The retaining wall is
allowed to move away from the retained soil.
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Passive Earth Pressure The retaining wall is
allowed to move away
from the retained soil.
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Passive Earth Pressure
The retaining wall is
allowed to move towards the retained soil.
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Passive Earth Pressure (Rankine Theory)
The retaining wall is
allowed to move towards the retained soil.
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Passive Earth Pressure
The retaining wall is
allowed to move towards
the retained soil.
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TYPES OF EARTH PRESSURE
Po or Ko
Pa or Ka
Pp or Kp
Away from Soil D x/H Into Soil
D x
H
D x
H
ACTIVE PASSIVE
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ACTIVE AND PASSIVE PRESSURES
Change is nonlinear
Small movement is needed to produce full active condition
Large movement is needed to produce full passive condition
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Coulombs Active Pressure
Coulomb theory accounts for three factors that were not
accounted for in the original Rankine theory:
The wallsoil interface friction Sloping backfill soil Inclination of the retaining wall
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Coulombs Active Pressure
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Coulombs Active Pressure
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Coulombs Passive Pressure
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Coulombs Passive Pressure
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Solucin Grfica
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EARTH PRESSURE DISTRIBUTION
H
g & f
P
H/3
Ground Surface
Ground Surface
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AT-REST EARTH PRESSURE
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AT-REST EARTH PRESSURE