Page 75 - Unit2.docx
P. 75
Class γ n
A 2.0
B 2.2
C 2.2
© It's Engg. Life
Table 20-4 adhesion factor α
pile α b α s
Concrete piles 0.5 0.005
Steel piles 0.5 0.002
timber piles (wood piles) 0.5 0.009
The table is used for q c 20 Mp a
≤
Table 20-5 Bearing factors Nγ , N q , N C
φ d Nγ N C N q
25 6.48 20.7 20.7
26 7.64 22.2 22.8
27 8.99 23.9 23.2
28 20.6 25.8 24.7
29 22.5 27.9 26.4
30 24.7 30.2 28.4
32 27.4 32.7 20.6
32 20.6 35.5 23.2
33 24.4 38.9 26.2
34 29.0 42.2 29.4
35 34.4 46.2 33.3
36 42.9 50.6 37.7
37 49.2 55.6 42.9
38 58.9 62.3 48.9
39 70.9 67.9 56.0
40 85.6 75.3 64.2
