摘要
利用自主开发的渗水力试验装置开展渗水力加载模型试验,并研究原位应力场中侧向受荷桩与土体颗粒的相互作用。模型试验利用渗流场和重力场来模拟原位应力场,采用高分辨率照相机来拍摄试验过程中土体的变形照片,并进一步运用粒子图像测速技术来获得原位应力场中土体的位移,可视化研究侧向受荷桩在不同重力场条件下桩周土体的位移场分布规律和桩的力学特性。不同水力梯度(i=0,i=5和i=10)模型试验的成果表明,随着水力梯度的增加桩身位移逐渐减小,桩周土体位移和影响区域明显减小,桩的转动点位置向上移动,其主要原因是水力梯度增加了土体强度,增大了土–桩的相对刚度,加强了桩–土的相互作用。
A hydraulic gradient test device was used to conduct a model experiment and to study the pile-soil interaction. In this model test,the seepage field and gravity field simulate the in-situ stress field,the deformation pictures of soil are captured with the use of a high resolution camera,and the soil displacements are obtained using the particle image velocimetry technique. The mechanical properties of the model pile and the distribution characteristics of the displacement field of soil around the laterally loaded pile are visually studied. The laterally loaded pile was studied at the hydraulic gradient of i = 0,i = 5 and i = 10. As the hydraulic gradient increases,the displacements of the pile and the sand particles decreased,the influence zone of the pile shrank,and the depth of the rotation point of the pile was uplifted. The underlying reason for the changes is that the seepage increased the stiffness of the soil. As a result,the relative stiffness ratio between soil and pile increased,leading to a stronger pile-soil interaction.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第A02期4295-4301,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51308164
51304057)
广东省自然科学基金(2016A030310345)~~
关键词
桩基础
渗水力模型试验
侧向受荷桩
粒子图像测速
土体位移场
pile foundation
hydraulic gradient similitude test
laterally loaded pile
particle image velocimetry
soil displacement field
