摘要
基桩水平承载力特征值通常由基桩容许水平变形值确定。连续结构(如桥梁)更关注墩顶水平位移容许限值对基桩水平承载性能的影响,判定连续跨越工程单桩水平承载力特征值时,应综合考虑基桩变形以及墩台变形限值等因素。通过分析刚性墩、柔性墩的水平变形特征,并根据墩柱变形限值要求得到海床(地面)处基桩的水平位移限值的分布特征。在此基础上,结合地基土承载特性,提出采用墩顶水平位移容许限值和海床(地面)处桩身水平位移限值两项指标综合判定连续结构(如桥梁)单桩水平承载力特征值的方法。结合实体工程试桩进行了实例分析,分析结果表明:判定的试桩单桩水平承载力特征值小于根据相关规范得到的判定值,说明通过试桩试验分析单桩水平承载性能的方法合理可行。
The characteristic value of horizontal bearing capacity of a pile was usually determined by its allowable horizontal deformation value.Since the horizontal bearing capacity of a pile in continuous structure such as bridge was usually considered to be influenced by the allowable horizontal displacement of the pier or the abutment over the pile,the deformation limit of the pile and the pier or the abutment should be considered comprehensively during the determination of characteristic value of horizontal bearing capacity of a bridge pile.The horizontal deformation characteristics of rigid pier and flexible pier were analyzed,and the distribution characteristics of the horizontal displacement limits of pile body at the seabed(ground)were obtained according to the provisions of the allowable horizontal displacement limits of the top surface of pier or abutment.On these basis,combined with the bearing characteristics of the foundation soil,the determination method of the characteristic value of the horizontal bearing capacity of the single pile in bridge engineering was put forward,which was controlled by the two indexes of the allowable displaeement of the top surface of pier or abutment and the horizontal displacement of the pile body at the seabed(ground).An example was analyzed combined with a pile test project.The analysis shows that the characteristic value of horizontal bearing capacity of a single pile determined is less than that obtained according to relevant codes.Therefore,it is still reasonable to determine the horizontal bearing capacity of a single pile through pile testing.
作者
张兴志
朴泷
杨宇
ZHANG Xingzhi;PIAO Long;YANG Yu(Zhejiang Hang-Shao-Yong Expressway Co.,Ltd.,Hangzhou 310014,China;China-Road Transportation Verification&Inspection Hi-Tech Co.,Ltd.,Beijing 100088,China)
出处
《建筑结构》
CSCD
北大核心
2021年第22期135-140,共6页
Building Structure
关键词
大直径基桩
水平承载力特征值
静载法
位移
large-diameter pile
characteristic value of horizontal bearing capacity
static load method
displacement
