Abstract

OBETA, I N; ONYIA, M E  and  OBIEKWE, D A. Comparative analysis of methods of pile-bearing capacity evaluation using CPT logs from tropical soils. J. S. Afr. Inst. Civ. Eng. [online]. 2018, vol.60, n.1, pp.44-55. ISSN 2309-8775.  http://dx.doi.org/10.17159/2309-8775/2018/v60n1a5.

This study presents the results of a comparative analysis of the performance of eight direct cone penetration test (CPT) methods in predicting the ultimate load-carrying capacity of a 300 mm diameter end-bearing pile, evaluated at defined soil depths using CPT logs obtained for various locations in the south-east and south-south regions of Nigeria. The methods used are the Schmertmann (1978), LCPC (Bustamante & Gianeselli 1982 - Laboratoire Central des Ponts et Chausees), De Ruiter and Beringen (1979), Tumay and Fakhroo (1982), Price and Wardle (1982), Philipponnat (1980), Aoki and De Alencar (1975), and the Penpile methods (Clisby et al 1978). The results of univariate analysis of variance indicated that the interactions between location and treatment (methods of pile capacity prediction), depth and treatment, and location and depth were statistically significant for cohesionless soils, but that the interaction between depth and treatment was not statistically significant for cohesive soils. Also, post-hoc tests (Least square difference and Bonferroni methods) showed that the LCPC and Philipponnat methods are best suited for cohesionless soils, while the LCPC, Tumay and Fakhroo (1982) and De Ruiter and Beringen (1979) methods are recommended for cohesive soils.

Keywords : comparative analysis; cone penetration test; pile capacity; univariate analysis of variance; post-hoc tests.

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