摘要
为了研究可液化地基处理前后单桩水平承载动力响应问题,以宿迁金鹰工程可液化场地为依托,采用基于CPTU测试的p-y(土抗力桩挠度)曲线法,构建了单桩水平动力承载数值计算模型.分析了不同加载振幅和振动次数下的单桩水平循环加载特征,比较了可液化地基处理前后的单桩水平承载动力响应规律.结果表明:可液化地基处理后单桩水平动力承载能力增强,桩周土抗液化能力提升,桩身截面最大弯矩上移,桩顶荷载传递深度降低;在桩顶水平循环加载作用下,桩身变形和弯矩随加载振幅和振动次数的增加而增大;十字翼共振法处理可液化场地对提升桩基水平承载力具有显著效果.
To investigate the lateral dynamic bearing response properties of single pile before and after liquefaction ground treatment,the numerical calculation model for single pile under lateral dynamic loadings was proposed by using the p-y( soil resistance-pile deflection) curve method from piezocone penetration test( CPTU) data based on the liquefaction ground of the Golden Eagle project in Suqian. The horizontal bearing capacities of single pile under cyclic loading conditions with different vibration amplitudes and times were studied,and the corresponding dynamic response rules of single pile before and after liquefaction ground treatment were compared. The results showthat after liquefaction ground treatment,both the horizontal bearing capacity of single pile and the soil liquefaction resistance increase,and the location of the pile maximum bending moment is up but the transfer depth of the pile top loading decreases. Both the pile deflection and the bending moment increase with the increase of the vibration amplitude and the vibration time under lateral cyclic load applied in pile top. Using the resonant compaction method with a criss cross section vibratory probe in liquefied foundation exhibits obvious effect for increasing the lateral bearing capacity of the pile.
出处
《东南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2016年第5期1098-1102,共5页
Journal of Southeast University:Natural Science Edition
基金
国家自然科学基金资助项目(41572273
51279032)
“十二五”国家科技支撑计划资助项目(2012BAJ01B02)
江苏省建设系统科技计划资助项目(2014ZD66)
关键词
液化
桩基
P-Y曲线
孔压静力触探(CPTU)
水平承载力
liquefaction
pile foundation
p-y curve
piezocone penetration test(CPTU)
lateral bearing capacity