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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第5期    总第273期    2017年5月

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文章编号:1672-7207(2017)05-1276-07
扩底楔形桩竖向抗拔承载力理论计算方法
周立朵1, 2,周航1, 2,孔纲强1, 2,郝耀虎1, 2

(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. 河海大学 土木与交通学院,江苏 南京,210098
)

摘 要: 基于极限平衡原理,建立竖向极限荷载下考虑桩型和土性的含未知参数的统一复合破坏面;根据最大最小值原理,确定破坏面函数中的未知参数及其表达式,从而计算得到极限承载力。通过针对扩底楔形桩和常规扩底桩模型试验结果的对比分析,验证本文所建立理论模型的准确性和可靠性,并分析桩型(如扩大头直径、楔形角等)和桩周土性(如凝聚力、内摩擦角等)等因素对扩底楔形桩竖向抗拔承载力特性的影响规律。研究结果表明,本文所建立的理论计算方法可以简单、有效地计算扩底楔形桩竖向极限抗拔承载力。

 

关键词: 桩基;扩底楔形桩;抗拔承载力;极限原理;破坏面

Uplift bearing capacity calculation method of belled wedge pile
ZHOU Liduo1, 2, ZHOU Hang1, 2, KONG Gangqiang1, 2, HAO Yaohu1, 2

1. Key Laboratory of Geomechanics and Embankment Engineering (Hohai University),
Ministry of Education, Nanjing 210098, China;
2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Abstract:Based on the limit equilibrium principle, one unified composite failure surface with unknown parameters under the vertical ultimate load was built, in which pile type and soil parameters were considered. Then the unknown parameters and the function of the composite failure surface expression were determined by the principle of the minimum and maximum values. The ultimate bearing capacity was obtained based on composite failure surface expression. The accuracy and reliability of the theoretical model built in this paper was verified by comparing with model test results. Then, influence pile parameters (such as, enlarged pile base, and taper angle, etc.) and soil parameters (such as, cohesion, and internal friction angle, etc.) analyze were carried out. The research results show that the ultimate pullout capacity of belled wedge pile can be calculated by the established theoretical calculation method effectively.

 

Key words: pile foundation; belled wedge pile; uplift bearing capacity; ultimate principle; failure surface

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