The plan of a group pile is shown in Figure P12.34. Assume that the piles are embedded

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The plan of a group pile is shown in Figure P12.34. Assume that the piles are embedded in a saturated homogeneous clay having a cu = 90 kN/m2. Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles = 600 mm, and length of piles = 20 m. Find the allowable load carrying capacity of the pile group. Use Table 12.11 and FS = 3.


Figure P12.34.

k-d -d- 1.

Table 12.11

Table 12.11

Variation of a (Interpolated

Values Based on

Terzaghi et al., 1996)

cu/pa ……………………………. α

≤ 0.1 ………………………….. 1.00

0.2 ………………………….. 0.92

0.3 ………………………….. 0.82

0.4 ………………………….. 0.74

0.6 ………………………….. 0.62

0.8 ………………………….. 0.54

1.0 ………………………….. 0.48

1.2 ………………………….. 0.42

1.4 ………………………….. 0.40

1.6 ………………………….. 0.38

1.8 ………………………….. 0.36

2.0 ………………………….. 0.35

2.4 ………………………….. 0.34

2.8 ………………………….. 0.34

Note: pa = atmospheric pressure ≈ 100 kN/m2

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Principles Of Foundation Engineering

ISBN: 9781337705028

9th Edition

Authors: Braja M. Das, Nagaratnam Sivakugan

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