Circular precast concrete piles with 60 cm in diameter will be driven to a tip penetration of 30 m. The soil profile is all clay and the water table is 2 m under the ground surface. Consider that the soils with cu < 60 kPa can be considered soft for this case. The unit weight of water is 10 kN/m3. Unconfined compression tests on samples taken from a thin-walled Shelby tubes were performed, and the soil profile has the following stratification: 0-5 m cu= 20 kPa γt=16.5 kN/m3 5-15 m cu= 40 kPa γt=17.5 kN/m3 15-80 m cu= 200 kPa γt=20.5 kN/m3 State any necessary assumptions. Show a summary table comparing the different capacities and discuss reasons for differences. a. Tomlinson's 1957 a method (alpha method #1) b. Tomlinson's 1971 a method (alpha method #2) a. Original λ method (lambda method #1) b. Revised λ method based on pile length (lambda method #2) c. API method (Randolph and Murphy 1985)
Circular precast concrete piles with 60 cm in diameter will be driven to a tip penetration of 30 m. The soil profile is all clay and the water table is 2 m under the ground surface. Consider that the soils with cu < 60 kPa can be considered soft for this case. The unit weight of water is 10 kN/m3. Unconfined compression tests on samples taken from a thin-walled Shelby tubes were performed, and the soil profile has the following stratification: 0-5 m cu= 20 kPa γt=16.5 kN/m3 5-15 m cu= 40 kPa γt=17.5 kN/m3 15-80 m cu= 200 kPa γt=20.5 kN/m3 State any necessary assumptions. Show a summary table comparing the different capacities and discuss reasons for differences. a. Tomlinson's 1957 a method (alpha method #1) b. Tomlinson's 1971 a method (alpha method #2) a. Original λ method (lambda method #1) b. Revised λ method based on pile length (lambda method #2) c. API method (Randolph and Murphy 1985)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Circular precast concrete piles with 60 cm in diameter will be driven to a tip penetration
of 30 m. The soil profile is all clay and the water table is 2 m under the ground surface.
Consider that the soils with cu < 60 kPa can be considered soft for this case. The unit
weight of water is 10 kN/m3. Unconfined compression tests on samples taken from a
thin-walled Shelby tubes were performed, and the soil profile has the following
stratification:
0-5 m cu= 20 kPa γt=16.5 kN/m3
5-15 m cu= 40 kPa γt=17.5 kN/m3
15-80 m cu= 200 kPa γt=20.5 kN/m3
State any necessary assumptions. Show a summary table comparing the different
capacities and discuss reasons for differences.
a. Tomlinson's 1957 a method (alpha method #1)
b. Tomlinson's 1971 a method (alpha method #2)
a. Original λ method (lambda method #1)
b. Revised λ method based on pile length (lambda method #2)
c. API method (Randolph and Murphy 1985)
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