Transmission And Substation Foundations - Technical Design Manual (TD06088E)
TABLE 4-12. REPORTED CORRELATIONS BETWEEN SPT N-VALUE AND PILE SIDE RESISTANCE (FROM LUTENEGGER 2011) Pile Type Soil β α
Reference
granular
0
2.0
Meyerhof (1976)
miscellaneous soils .(f s < 170 kPa)
10
3.3
Decourt (1982)
cohesive
0
10
Shioi & Fukui (1982)
driven displacement
cohesive cohesionless
0 0
3 1.8
Bazaraa & Kurkur (1986)
sandy clayey
29 34
2.0 4.0
Kanai & Yubuuchi (1989)
misc
0
1.9
Robert (1997)
granular
0
1.0
Meyerhof (1976)
granular
55
5.8
Fujita et al. (1977)
cohesionless
0
3.3
Wright & Reese (1979)
DESIGN METHODOLOGY
cohesive (f s < 170 kPa)
10
3.3
Decourt (1982)
cohesive
0
5.0
Shioi & Fukui (1982)
cohesive cohesionless
0 0
1.8 0.6
Bazaraa & Kurkur (1986)
residual soil & weathered rock
0
2.0
Broms et al. (1988)
clay sand
0 0
1.3 0.3 3.9 4.9
Koike et al. (1988)
35 24
sandy soil cohesive
Kanai & Yubuuchi (1989)
bored
residual soil
0
4.5
Winter et al. (1989)
gravel sand silt clay
0 0 0 0
6.0 4.0 2.5 1.0
Hirayama (1990)
residual soils
0
2.0
Chang & Broms (1991)
clayey soil sandy soil
0 0
10.0 3.0 1.18 0.65
Matsui (1993)
17.3 18.2
misc.
Vrymoed (1994)
misc.
0
1.9
Robert (1997)
sand
0
5.05
Kuwabara & Tanaka (1998)
weathered rock
0
4
Wada (2003)
cohesionless cohesive cohesionless (f s < 200 kPa) cohesive (f s < 150 kPa)
0 0
5.0 10.0
Shoi & Fukui (1982)
30
2.0
cast-in-place
Yamashita et al.(1987)
0
5.0
Note: f s = β + α N (f s in units of kPa)
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