2. (a) A retaining wall 6 m high with a vertical back supports a cohesionless soil with a dry unit weight of 16 kN/m', a saturated unit weight of 19.62 kN/m' and an angle of friction of 35°. The surface of the soil is horizontal and at level with the top of the wall. Neglecting wall friction, determine the total active earth thrust of the wall per lineal metre, and the height above the base of the wall at which the thrust acts. Use the following equations to answer both questions: aha Ka = Kp %3D 1-sino Ka 1+ sino 1+ sino Kp 1- sing %3D (b) For the wall described in the previous question, assume that due to poor drainage the water table rises to 2.5 m below the surface. Determine the new determine thrust of the wall per lineal metre, and the height above the base of the wall at which the thrust acts. total active earth
2. (a) A retaining wall 6 m high with a vertical back supports a cohesionless soil with a dry unit weight of 16 kN/m', a saturated unit weight of 19.62 kN/m' and an angle of friction of 35°. The surface of the soil is horizontal and at level with the top of the wall. Neglecting wall friction, determine the total active earth thrust of the wall per lineal metre, and the height above the base of the wall at which the thrust acts. Use the following equations to answer both questions: aha Ka = Kp %3D 1-sino Ka 1+ sino 1+ sino Kp 1- sing %3D (b) For the wall described in the previous question, assume that due to poor drainage the water table rises to 2.5 m below the surface. Determine the new determine thrust of the wall per lineal metre, and the height above the base of the wall at which the thrust acts. total active earth
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:2. (a) A retaining wall 6 m high with a vertical back supports a
cohesionless soil with a dry unit weight of 16 kN/m', a
saturated unit weight of 19.62 kN/m and an angle of friction
of 35°. The surface of the soil is horizontal and at level with
the top of the wall. Neglecting wall friction, determine the
total active earth thrust of the wall per lineal metre, and the
height above the base of the wall at which the thrust acts.
Use the following equations to answer both questions:
Oha
K. =
of
Kp
1- sino
Ka
1+ sing
1+ sing
Kp
1– sinø
(b) For the wall described in the previous question, assume that
due to poor drainage the water table rises to 2.5 m below the
surface. Determine the new determine the total active earth
thrust of the wall per lineal metre, and the height above the
base of the wall at which the thrust acts.
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