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