Problem 3) Shown below is a cross-section through a soil layer. A Shelby tube sample was taken from a depth of 25 ft. The sample was extruded in a laboratory, thus subjected to zero total stress. Assume Ko = 0.5 and Ā = -0.1, determine the effective stress on the sample after extrusion. Use the basic Skempton (1954) and Ladd and Lambe (1963) approach to determine the change in pore pressure.
Problem 3) Shown below is a cross-section through a soil layer. A Shelby tube sample was taken from a depth of 25 ft. The sample was extruded in a laboratory, thus subjected to zero total stress. Assume Ko = 0.5 and Ā = -0.1, determine the effective stress on the sample after extrusion. Use the basic Skempton (1954) and Ladd and Lambe (1963) approach to determine the change in pore pressure.
Chapter2: Loads On Structures
Section: Chapter Questions
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Problem 3) Shown below is a cross-section through a soil layer. A Shelby tube sample was taken from a depth of 25 ft. The sample was extruded in a laboratory, thus subjected to zero total stress.
- Assume Ko = 0.5 and Ā = -0.1, determine the effective stress on the sample after extrusion. Use the basic Skempton (1954) and Ladd and Lambe (1963) approach to determine the change in pore pressure.
Transcribed Image Text:Problem 3) Shown below is a cross-section through a soil layer. A Shelby tube sample was taken
from a depth of 25 ft. The sample was extruded in a laboratory, thus subjected to zero total stress.
(a) Assume K, = 0.5 and à = -0.1, determine the effective stress on the sample after extrusion.
Use the basic Skempton (1954) and Ladd and Lambe (1963) approach to determine the
change in pore pressure.
10.0 ft
15.0 ft
Sample
Moist Sand
Saturated Clay
e = 0.55
@ = 6%
G₁ = 2.7
@ = 36.8%
G₂ = 2.72
(b) A 25-foot diameter circular concrete tank is placed at the ground surface. The tank exerts
the contact pressure of 1,000 psf. Assume that the changes in total stresses at the sample
depth due to the concrete tank are Aov = 30% and Aoh = 6% of the contact pressure.
Immediately after the tank is placed, what are the effective stresses and pore pressure at
the sample location?
(c) A very, very long time after the tank is placed, what are the effective stresses and pore
pressures at the sample location?
Expert Solution
Step 1 Given data
Ko = 0.5
Ā = -0.1
To find- Effective stress of the sample after extrusion
Skempton (1954) and Ladd and Lambe (1963) approach to determine the change in pore pressure.
Step by step
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