Failure load analysis methods based on instrumented large diameter bored pile load tests

Danilo Costa de França, Adalberto Hideo Viana

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Deep Foundations

ABSTRACT: This paper presents an evaluation of the results (load versus settlement curve) of three instrumented load tests, performed on large diameter bored piles, through some extrapolation methods of failure load. The load tests were performed on three instrumented piles of 1.20 m in diameter and lengths between 20 and 30m, with the use of excavated mud stabilizer (bentonite). Methods of extrapolation of the failure load used are characterized by using information of the tests and the geometric characteristics of the piles. The methods are: Method of stiffness Décourt (1996), Method Davisson (1972), Method of ISO 6122 (2010), Method of Brinch-Hansen 80%, Method Kondner-Chin (1970, 1971), Method Van der Veen (1953), Method Mazurkiewicz (1972), Method of Butler & Roy (1977) and Method of De Beer (1968). Analyses show the applicability of the extrapolation methods of failure load for the results of instrumented load test of large diameter in typical geological horizon of the Tertiary sediments of the sedimentary basin of São Paulo, Brazil, with intercalations of clay and sandy soil. RESUMO O presente trabalho apresenta a avaliação dos resultados (curva carga vs recalque) de três provas de carga instrumentadas, realizada em estacas escavadas de grande diâmetro, através de alguns métodos de extrapolação da carga de ruptura. As provas de carga instrumentadas foram realizadas em 3 estacas de 1,20m de diâmetro e comprimentos entre 20 e 30m, escavadas com o uso de lama estabilizante (bentonita). Os métodos de extrapolação da carga última utilizados caracterizam-se por usarem, tanto informações dos ensaios, quanto das características geométricas das estacas. Os métodos utilizados são: Método da Rigidez de Décourt (1996), Método de Davisson (1972), Método da NBR 6122 (2010), Método de Brinch-Hansen 80%, Método de Chin-Kondner (1970, 1971), Método de Van der Veen (1953), Método de Mazurkiewicz (1972), Método de Butler & Roy (1977) e o Método de De Beer (1968). As análises mostram a aplicabilidade dos métodos de extrapolação da carga de ruptura para os resultados da prova de carga instrumentada de grande diâmetro em horizonte geológico típico de sedimentos de período terciário da Bacia Sedimentar de São Paulo, Brazil, com intercalações de solo argilo e arenoso.

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Cite this article:
Danilo Costa de França; Adalberto Hideo Viana (2011) Failure load analysis methods based on instrumented large diameter bored pile load tests in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper954,author = Danilo Costa de França; Adalberto Hideo Viana ,title = Failure load analysis methods based on instrumented large diameter bored pile load tests,year = 2011}