岩土力学 ›› 2018, Vol. 39 ›› Issue (12): 4554-4560.doi: 10.16285/j.rsm.2017.0812

• 基础理论与实验研究 • 上一篇    下一篇

刚性桩复合地基中性面深度与桩土应力比计算

姜文雨1,刘 一2   

  1. 1. 西南交通大学 土木工程学院,四川 成都 610031;2. 中国港湾工程有限责任公司,北京 100027
  • 收稿日期:2017-04-26 出版日期:2018-12-11 发布日期:2018-12-31
  • 通讯作者: 刘一,男,1992年生,硕士,工程师,主要从事基础工程方面的研究工作。E-mail: yiliu@chec.bj.cn E-mail:JIANG.Wen-yu@outlook.com
  • 作者简介:姜文雨,男,1993年生,硕士,主要从事桩-土复合地基及基础工程方面的的研究工作。

Determination of neutral plane depth and pile-soil stress ratio of the rigid pile composite foundation

JIANG Wen-yu1, LIU Yi2   

  1. 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. China Harbour Engineering Company Ltd., Beijing 100027, China
  • Received:2017-04-26 Online:2018-12-11 Published:2018-12-31

摘要: 刚性桩复合地基中性面深度及桩土应力比的简化计算主要基于桩侧摩阻力线性分布假设,当桩身较长时,桩端侧摩阻力的计算值会远大于实际值,致使中性面深度及桩土应力比的计算结果与实际差别较大,故有必要对线性分布模式予以修正。据此将桩侧摩阻力分布简化为分段线性模式,考虑负摩阻力作用及桩上、下刺入变形,根据褥垫层-桩-土变形协调关系推导了刚性桩复合地基中性面深度、桩顶面桩土应力比、中性面桩土应力比计算公式。最后通过模型试验与工程实例验证,计算值与实测值吻合较好。

关键词: 刚性桩复合地基, 中性面深度, 桩土应力比, 变形协调, 负摩阻力

Abstract: Based on the linear distribution model of the side friction of pile, the theoretical value of pile side friction will far exceed the actual value when the pile is comparatively long. Consequently, the calculation of neutral plane depth and pile-soil stress ratio of the rigid pile composite foundation is quite different from the reality and needs modification. Therefore, the distribution of pile side friction was assumed to be piecewise linear, with influence of negative friction and behavior of pile upward and downward puncture deformation taken into consideration. According to the cushion-pile-soil deformation compatibility condition, a theoretical calculation model was created to obtain the neutral plane depth and pile-soil stress ratio on the top surface and neutral surface of pile. Finally, the calculation method was verified by field measurement as well as model test results of the rigid pile composite foundation, and theoretical values agreed well with the experimental data.

Key words: rigid pile composite foundation, neutral plane depth, pile-soil stress ratio, deformation compatibility, negative friction

中图分类号: 

  • TU 470
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