文档介绍：第 26 卷第 10 期岩土力学
2005 年 10 月 Rock and Soil Mechanics Oct. 2005
文章编号:1000-7598-(2005) 10―1597―05

液化土层中桩基水平承载特性分析
王建华,冯士伦
(天津大学岩土工程研究所,天津 300072)

摘要:通过桩土相互作用的振动台模型试验,获得了不同相对密度的砂土在振动液化过程中桩身弯矩随土层振动累积孔压的
变化关系。进而通过拟静力方法,确定了土层液化过程中的衰化 p-y 曲线,并计算出桩身弯矩的分布。计算结果与实测结果的
比较分析表明:若土层的振动累积孔压比 ru≤ 时,桩的水平承载能力没有明显降低。当土层的振动累积孔压比 ru≥ 时,
若土层的相对密度 Dr≤40 %,桩的水平承载能力降低 90 %;若土层的相对密度 Dr≥50 %,桩的水平承载能力降低 75 %。
关键词:桩的水平承载力;砂土液化;桩土相互作用;振动台试验
中图分类号:TU 473 文献标识码:A

Research on lateral resistance of pile foundation in liquefaction strata

WANG Jian-hua, FENG Shi-lun
(Institute of Geotechnical Engineering, Tianjin University, Tianjin 300072, China)

Abstract: Interactions between sands to liquefaction and piles were studied using shake table model tests. The relationships between
pile bending moments and cyclic cumulative pore water pressure ratio were obtained for different relative densities sands to
liquefaction. Degradation p-y curves of soil-pile interaction were determined during the sand to liquefaction using pseudo-static
method. Bending moments along the pile are further calculated using the nonlinear Winkler foundation beam and degradation p-y
curves. Calculating and test bending moments pared. Results show that the lateral resistance of the pile does not reduce if
the cyclic cumulating pore water pressure ratio ru≤, it degra