Solve Problem 12.13 using Eqs. (12.59) and (12.60). Problem 12.13 A concrete pile 406 mm 406

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Solve Problem 12.13 using Eqs. (12.59) and (12.60).


Problem 12.13

A concrete pile 406 mm × 406 mm in cross section is shown in Figure P12.13. Calculate the ultimate skin friction resistance by using the

a. α method [use Eq. (12.61) and Table 12.11]

b. λ method

c. β method

Use ϕ'R = 20° for all clays, which are normally consolidated.


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


Eq. (12.61)

Q, = Efp AL = Eac,p AL


Figure P12.13.


Eq. (12.58).


Eqs. (12.59)


Eqs. (12.60)

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Principles Of Foundation Engineering

ISBN: 9781337705028

9th Edition

Authors: Braja M. Das, Nagaratnam Sivakugan

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