摘要
基于大比例尺模型试验方法,开展砂土地基中X形桩-筏复合地基的动力特性试验研究;振动波型采用正弦波荷载,通过改变循环荷载的振幅,实测不同循环荷载下X形桩-筏复合地基的速度响应、桩身动应力响应以及动土压力响应随荷载振幅的变化规律,揭示X形桩-筏复合地基的动力响应机理。研究结果表明:随着地基深度的增加,桩-筏复合地基的速度响应逐渐衰减、桩身动应力大致呈波动性减小;随着荷载振幅的增加,速度响应、桩顶动应力响应以及动土压力响应均近似呈线性增加;碎石垫层具有良好的减震作用。
Based on large scale model test method,experimental study on dynamic response of cast-in-situ X‒shaped concrete(referred as XCC)pile-raft composite foundation embedded in sand was carried out.The sine wave load was used,and the amplitude of cyclic loads was changed.The velocity response of raft,dynamic stress response of pile,dynamic soil pressure response of XCC pile-raft composite foundation under cycle loads were measured.The dynamic response mechanism of the XCC pile-raft composite foundation was discussed.The results show that the vibration velocity of pile-raft composite foundation gradually decreases and the dynamic stress response of pile decreases approximately in a ware shape with the depth.The velocity response,dynamic stress response of pile top,and the dynamic soil pressure response nearly linearly increase with the increase of load amplitude.Gravel cushion layer has a good damping effect.
作者
孙广超
孔纲强
刘汉龙
楚剑
SUN Guangchao;KONG Gangqiang;LIU Hanlong;CHU Jian(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,China Three Gorges University,Yichang 443002,China;College of Civil Engineering,Chongqing University,Chongqing 400450,China;School of Civil and Environmental Engineering,Nanyang Technology University,639798,Singapore)
出处
《中南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2020年第2期499-506,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金重点国际(地区)合作研究资助项目(51420105013)
国家自然科学基金资助项目(51809151)~~
关键词
桩-筏复合地基
X形桩
振幅
动力荷载
模型试验
pile-raft composite foundation
XCC pile
amplitude
dynamic load
model test