Lateral Pressures In Cohesionless Soils
Posted in Soil Engineering |
Email This Post
For walls that retain cohesionless soils and are free to move an appreciable amount, the total thrust from the soil is
P = [½ g H2cosi[cos i - {(cos i )2 – (cosf) 2 }1/2]/ [cos i +{(cos i )2 – (cosf)2}1/2
When the surface behind the wall is level, the thrust is
P=0.5gH2KA
where
KA=[tan(45-f/2]2
The thrust is applied at a point H /3 above the bottom of the wall, and the pressure distribution is triangular, with the maximum pressure of 2P / H occurring at the bottom of the wall.
For walls that retain cohesionless soils and are free to move only a slight amount, the total thrust is 1.12P, where P is as given earlier. The thrust is applied at the midpoint of the wall, and the pressure distribution is trapezoidal, with the maximum pressure of 1.4P / H extending over the middle six-tenth of the height of the wall.
For walls that retain cohesionless soils and are completely restrained (very rare), the total thrust from the soil is
P = [½ g H2cosi[cos i + {(cos i )2 – (cosf) 2 }1/2]/ [cos i -{(cos i )2 – (cosf)2}1/2
When the surface behind the wall is level, the thrust is
P=0.5gH2KP
where
KP=[tan(45-f/2]2
The thrust is applied at a point H /3 above the bottom of the wall, and the pressure distribution is triangular, with the maximum pressure of 2P / H occurring at the bottom of the wall.
