承台-倾斜桩体系承载力性状分析

邵 勇; 朱进军; 马庆华

doi:10.11988/ckyyb.20140578

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

岩土工程

承台-倾斜桩体系承载力性状分析

邵勇,朱进军,马庆华

作者信息 +

Bearing Capacity Behavior of Inclined Pile-cap System

SHAO Yong,ZHU Jin-jun,MA Qing-hua

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文章历史 +

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。

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.

导出引用

邵勇,朱进军,马庆华. 承台-倾斜桩体系承载力性状分析[J]. 长江科学院院报. 2015, 32(12): 98-102 https://doi.org/10.11988/ckyyb.20140578

SHAO Yong,ZHU Jin-jun,MA Qing-hua. Bearing Capacity Behavior of Inclined Pile-cap System[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(12): 98-102 https://doi.org/10.11988/ckyyb.20140578

中图分类号： TU473

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