长江科学院院报 ›› 2015, Vol. 32 ›› Issue (12): 98-102.DOI: 10.11988/ckyyb.20140578

• 岩土工程 • 上一篇    下一篇

承台-倾斜桩体系承载力性状分析

邵 勇,朱进军,马庆华   

  1. 连云港职业技术学院 建筑工程系,江苏 连云港 222006
  • 收稿日期:2014-07-15 出版日期:2015-12-20 发布日期:2015-12-11
  • 作者简介:邵 勇(1982-),男,江苏连云港人,讲师,博士,主要从事岩土工程方面的教学及科研工作,(电话)13851289149
  • 基金资助:

    住房和城乡建设部科技计划项目(2015-K3-023);江苏省建设系统科技项目(2015ZD37);江苏省“六大人才高峰”高层次人才资助项目(2014-JZ-016)

Bearing Capacity Behavior of Inclined Pile-cap System

SHAO Yong,ZHU Jin-jun,MA Qing-hua   

  1. School of Architectural Engineering,Lianyungang Technical College,Lianyungang 222006,China
  • Received:2014-07-15 Online:2015-12-20 Published:2015-12-11

摘要:

预应力管桩在施工中发生桩身倾斜的现象屡见不鲜。为得到承台连接下倾斜桩的承载力特性,通过现场实测数据反演得到了合理的土层及桩体参数,之后建立数值模型,分析了承台下有2根桩且其中1根桩为倾斜桩的结构体系,在3种不同倾斜方向工况下的承载力性状。研究结果表明:单根桩体倾斜对承载力的影响不大,特别是工况1条件下,桩体倾斜对承载力的影响甚微;桩身轴力随着桩体倾斜程度的增加而增大,仅在工况1中倾斜桩的轴力发展趋势为先增大后减小。3种工况下桩身弯矩分布特征类似,且桩顶弯矩最大;但是当桩体倾斜方向不同时,桩顶正负弯矩也不同。综合来看,3种工况的承载力大小为工况1>工况2>工况3。

关键词: 桩基工程, 倾斜群桩, 承台, 承载力, 数值模拟

Abstract:

Accidents such as inclination of pile shaft are common in the construction of prestressed concrete pipe pile.In order to get the bearing capacity behavior of inclined pile-cap system,firstly,we carried out in-situ tests and obtained rational parameters for strata and pile shaft.Then,we computed the structure system of cap with two piles,one of which is inclined,and discussed the system under 3 working conditions.The results show that: bearing capacity of the system is not much affected on the condition of inclination of one pile,in particular,the effect can be negligible under the working condition 3;then the piles axial force increases with the increase of tilt degree of the pile shaft, only in the case 1,the axial force increases first and then decreases;furthermore,the distribution characteristics of moment is similar in three conditions:the maximum moment is located at the top of pile,but when the tilt direction is different,the pile moments symbol is also different;in the general,the maximum value of bearing capacity for three conditions is case 1,followed by case 2,case 3.

Key words: pile foundation engineering, inclined pile group, cap, bearing capacity, numerical simulation

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