摘要
通过双桩基础的大比尺模型试验研究水平偏心荷载下基桩的受力变形性状;采用ABAQUS数值模型分析荷载偏心对双桩基础工作性状的影响。研究表明,双桩基础水平荷载–承台水平位移曲线与水平单桩曲线变化规律相同,荷载偏心对双桩基础水平变形有一定影响,水平刚度随偏心距增加而降低;水平偏心荷载导致双桩基础中基桩桩头剪力不均匀,接近加载点的基桩桩头剪力最大,随偏心距增加基桩桩头剪力与运动方向出现相反的情况;水平和扭转荷载耦合使基桩扭转刚度较单桩明显增加,但偏心距增加使该耦合效应影响减小;基桩扭转反力对抵抗外加扭矩的贡献随着水平荷载增加减小。
A large scale model test of two-pile foundation in saturated silt is carried out to investigate the response under eccentric lateral loading. An ABAQUS numerical model is built and validated by the model test result. The effect of eccentricity of applied lateral loading on the behavior of the foundation is further studied using the validated model. It is found that the applied load-horizontal displacement curves of the pile cap of the two-pile foundation are close to a laterally loaded single pile curve in shape. The lateral stiffness decreases with the increasing eccentricity of the applied load. Eccentricity can induce significant difference in pile-head shearing between the two piles. The pile next to the load point undertakes more shear force and the pile-head shear resistance of another pile can be opposite to its displacement in direction under a certain eccentricity. The torsional rigidity of the individual piles is far greater than that of a corresponding single pile subjected to torsion because of the deflection-torque coupling effect in the piles,but the influence of the coupling effect decreases with the increasing eccentricity. Both torsional and lateral resistances of the individual piles contribute to resist the applied torque;and the contribution of torsional resistances of the individual piles to the applied torque significantly decreases with the increasing applied load.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期4174-4182,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50809060)
中央高校基本科研业务费专项资助项目(2011QNA4013)
浙江省重点创新团队支持计划项目(2011R09050)
关键词
桩基础
水平偏心荷载
大尺寸模型试验
数值模拟
pile foundations
eccentric lateral load
large-scale model test
numerical simulation
