a) A group of 9 piles (piled foundation) with 3 piles in a row was driven into a soft clay extending from the ground level to a great depth The diameter and the length of the piles were 30 cm and 10 m respectively. The unconfined compressive strength of the clay is 70 kPa. If the piles were placed 90 cm center to center, solve for the allowable load on the pile group on the basis of a shear failure criterion for a factor of safety of 2.5. Assume Adhesion factor a-1. Hint: average undrained shear strength Cu is equation under shear strength at the base Cub. Cu = Cub b) It is required to construct a pile foundation comprised of 20 piles arranged in 5 columns and 4 rows and are spaced 90 cm center to center in the group. The diameter and lengths of the piles are 30 cm and 9 m respectively. The bottom of the piles cap is located at a depth of 2.0 m from the ground surface. The details of the soil properties and other details are given below with reference to ground level as the datum. The water table was found at a depth of 4 m from the ground level. Solve for the consolidation settlement of the pile foundation, if the total load imposed on the foundation is 2500 kN.
a) A group of 9 piles (piled foundation) with 3 piles in a row was driven into a soft clay extending from the ground level to a great depth The diameter and the length of the piles were 30 cm and 10 m respectively. The unconfined compressive strength of the clay is 70 kPa. If the piles were placed 90 cm center to center, solve for the allowable load on the pile group on the basis of a shear failure criterion for a factor of safety of 2.5. Assume Adhesion factor a-1. Hint: average undrained shear strength Cu is equation under shear strength at the base Cub. Cu = Cub b) It is required to construct a pile foundation comprised of 20 piles arranged in 5 columns and 4 rows and are spaced 90 cm center to center in the group. The diameter and lengths of the piles are 30 cm and 9 m respectively. The bottom of the piles cap is located at a depth of 2.0 m from the ground surface. The details of the soil properties and other details are given below with reference to ground level as the datum. The water table was found at a depth of 4 m from the ground level. Solve for the consolidation settlement of the pile foundation, if the total load imposed on the foundation is 2500 kN.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:a) A group of 9 piles (piled foundation) with 3 piles in a row was driven into a soft clay
extending from the ground level to a great depth The diameter and the length of the
piles were 30 cm and 10 m respectively. The unconfined compressive strength of the
clay is 70 kPa. If the piles were placed 90 cm center to center, solve for the allowable
load on the pile group on the basis of a shear failure criterion for a factor of safety of
2.5. Assume Adhesion factor a=1.
Hint: average undrained shear strength , is equation under shear strength at the base
Cub. Cu = Cub
b) It is required to construct a pile foundation comprised of 20 piles arranged in 5 columns
and 4 rows and are spaced 90 cm center to center in the group. The diameter and lengths
of the piles are 30 cm and 9 m respectively. The bottom of the piles cap is located at a
depth of 2.0 m from the ground surface. The details of the soil properties and other
details are given below with reference to ground level as the datum. The water table
was found at a depth of 4 m from the ground level. Solve for the consolidation
settlement of the pile foundation, if the total load imposed on the foundation is 2500
kN.
Table 1. Soil Properties
Depth (m)
From
Soil Properties
То
Silt, saturated, y=16 kN/m?
Clay, saturated, y=19.2 kN/m
Clay, saturated, Y=19.2 kN/m², q = 120 kN/m?, s, = 0.80, c. = 0.23
Clay, y=18.24 kN/m, q., = 90 kN/m?, e, = 1.08, c. = 0.34
Clay, y=20 kN/m,
Rocky stratum
2
4
4
12
12
14
14
17
4 = 180 kN/m, s, = 0.70, c = 0.2
17
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