摘要
传统桩基础多采用等桩距设计,这导致基础出现碟形不均匀沉降.本文通过理论分析,基于Mindlin与Boussinesq解建立桩筏基础沉降荷载分析理论.结合实际工程,将桩筏基础中间约1/3区域划分为核心区,其余周边为非核心区.在原有等桩距布桩方案上,改变非核心区与核心区桩距之比,提出4种布桩方案.计算分析结果表明,基础中部沉降最大,边缘最小;随着桩距比的增大,中心沉降减小,边缘沉降增大,进而不均匀沉降降低,但桩距比大于1.40后降低效果减弱.因此,对不均匀沉降要求较高的工程,建议采用变桩距布桩,合理桩距比取1.40左右.
The traditional pile foundation is mostly designed with equal pile spacing,which leads to the uneven settlement of the foundation.In this paper,through theoretical analysis,the settlement load analysis theory of pile-raft foundation was established based on Mindlin and Boussinesq solutions.Combined with practical engineering,about 1/3 of the middle area of pile raft foundation was divided into core area,and the rest is non-core area.On the original pile arrangement scheme with equal pile spacing,four pile arrangement schemes were proposed by changing the ratio of pile spacing between non-core area and core area.The calculation and analysis results show that the settlement in the middle of the foundation is the largest and the edge is the smallest.With the increase of pile spacing ratio,the central settlement decreases,the edge settlement increases,and the uneven settlement decreases,but the reduction effect is weakened when the pile spacing ratio is greater than 1.40.Therefore,for the projects with high requirements for uneven settlement,it is recommended to use variable pile spacing pile,and the reasonable pile spacing ratio is about 1.40.
作者
孔德志
甘文松
常远
原华
KONG Dezhi;GAN Wensong;CHANG Yuan;YUAN Hua(School of Civil Engineering and Architecture of Henan University,Henan Kaifeng 475004,China;Cscec Zhongyuan Architectural Design Institute Co.,Ltd,Zhengzhou 450006,China)
出处
《河南大学学报（自然科学版）》
CAS
2022年第2期210-217,共8页
Journal of Henan University:Natural Science
基金
河南省重点研发与推广专项(科技攻关)(202102310247)
关键词
变刚度调平设计
中心沉降
不均匀沉降
桩距比
variable rigidity design
central settlement
uneven settlement
pile spacing ratio
