Bearing capacity factors, N
q and N
c, for deep foundations have been determined using the dimensionless cavity expansion factors, F
q and F
c. Both angle of friction, Φ, and rigidity index, I
r have significant effect on N
q and N
c. N
q - Φ curves for various values of I
r are prepared on the basis of analytically calculated value of F
q, Vesic's, λ
v, and Yasufuku and Hyde's, λ
YH, factors. Meyerhof (1976) N
q - Φ charts are within upper half of the envelope of N
q - Φ curves. Hannigan et al. (1996) and Fellinuos (1991) N
q - Φ charts are within envelopes of N
q - Φ curves for I
r. = 100 to 1000, while API (1993) N
q- Φ charts are within envelopes of N
q - Φ curves for I
r = 10 to 100. Using F
q and λ
YH or F'
q and λ
v or λ
SMJ factors, the study shows that the cone tip resistance, q
c, can be estimated, on average, with an accuracy of ±15 percent.
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