摘要
基于3根不同长度的超长桩破坏性试桩试验,对超长桩的承载特性和不同长度超长桩的特点进行对比分析。随着桩长和桩径的增加,超长桩的刚度会有较大幅度增加。超长桩的长度越大,桩顶荷载越难以向桩身下部传递。超长桩桩身上部侧阻随着深度增加,但达到30~40m深度处侧阻值基本可以达到极限,极限侧阻值大概在80~100k Pa范围内。超长桩在正常工作状态下端阻比仅为1%左右,可以认为超长桩此时为纯摩擦桩。
Based on destructive test of three super-long piles with different length,bearing behavior and characteristics of super-long piles with different length are analyzed. The stiffness of super-long piles grows with the growth of the pile length and diameter. When the length of the super-long piles is long enough,the load on the pile top is hard to transfer to the lower part of the piles. The shaft resistance of the piles grows with the growth of the depth on the upper part of the piles. It reaches the ultimate value on the depth of 30-40 m,and the ultimate shaft resistance value is about 80 ~ 100 k Pa. The tip resistance ratio of super-long piles is about 1% in the working state,meanwhile,the super-long piles are friction piles.
出处
《施工技术》
CAS
北大核心
2017年第S2期145-147,共3页
Construction Technology
基金
天津市建委科技项目(2014-9)
关键词
超长桩
工作性状
静载试验
super-long piles
working performance
static loading test
