## Journal of Central South University

 第46卷    第5期    总第249期    2015年5月

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(1. 河海大学 岩土力学与堤坝工程教育部重点实验室，江苏 南京，210098；
2. 绍兴文理学院 土木工程学院， 浙江 绍兴，312000；
3. 墨尔本大学 墨尔本设计学院，维多利亚，澳大利亚
)

Composite logarithmic model for static load-settlement curve of cast-in-place single pile with uniform-circular cross section

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,
Hohai University, Nanjing 210098, China;
2. School of Civil Engineering, Shaoxing University, Shaoxing 312000, China;
3. Melbourne School of Design, Melbourne University, Victoria, Australia

Abstract:According to field tested data, mathematical property of the static load-settlement curve (Q-S curve) of cast-in-place pile with uniform-circular cross section (UCSC pile) was summarized, and X-shape fitted error of traditional hyperbolic model was analyzed. The three-parameter composite logarithmic model for UCSC pile’s Q-S curve was presented, which is characterized by going through point, monotone increasing, convex and up limited function. The fitted values of field investigated static loading data of many UCSC piles were compared with the measured values. The results show that the composite logarithmic model can minimize the X-shape fitted errors caused by hyperbolic model. The presented fittings are in agreement with the investigated UCSC pile’s Q-S curves. The presented model can precisely predict the end part of the Q-S curve of UCSC pile after fitting its initial part, which is helpful to determining bearing capacity of UCSC pile in static load test.

Key words: pile foundation; UCSC pile; Q-S curve; bearing capacity; composite logarithmic model

 中南大学学报（自然科学版） ISSN 1672-7207 CN 43-1426/NZDXZAC 中南大学学报（英文版） ISSN 2095-2899 CN 43-1516/TBJCSTFT