Redo Problem 12.10 using the l method for estimating the skin friction and Meyerhof’s method for the point load estimation.

Problem 12.10

A concrete pile 15.24 m long having a cross section of 406 mm × 406 mm is fully embedded in a saturated clay layer for which g_sat = 19.02 kN/m³, ϕ = 0, and c_u = 76.7 kN/m². Determine the allowable load that the pile can carry. (Let FS = 3.) Use the α method Eq. (12.61) and Table 12.11 to estimate the skin friction and Vesic’s method for point load estimation.

Eq. (12.61)

Table 12.11

Variation of a (Interpolated

Values Based on

Terzaghi et al., 1996)

c_u/p_a ……………………………. 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: p_a = atmospheric pressure ≈ 100 kN/m²

2, = Efp AL = Eac,p AL