摘要
针对土体变形在上覆土体中的扩散传播问题,设计了土体变形扩散传播模型试验。通过设定底部位移边界,结合数字图像相关技术(PIV)研究中砂中土体变形扩散传播特性,探讨边界位移模式对土体变形扩散传播的影响规律。结果表明:边界位移在砂土中呈现扩散传播规律,不仅在土体中引起竖向位移,还引起水平位移;土体竖向位移呈现与底部边界位移相类似的分布特征,而土体水平位移沿模型中心呈对称分布;土体变形扩散传播导致土体体积和密度变化,研究成果为合理建立土体变形扩散传播模型奠定了试验依据。
For theissues of deformation diffusion-convection in the overlying soil,a indoor model tested by using the particle image velocimetry(PIV)technology and setting device of bottom displacement boundary,was designed to investigate the diffusion-convection characteristics of soil deformation in medium sand.The rule of deformation diffusion-convection was discussed in the different boundary displacement modes.The results indicated that the boundary displacement was diffused upwards in the overlying soil.The deformation diffusion-convection not only caused the vertical displacement,but also caused the horizontal displacement.The distribution of vertical displacement was similar to the bottom boundary displacement mode.The horizontal displacement was distributed symmetrically along the center of the model.The deformation diffusion-convection leaded to the change of volume and density of soil.The test results provided experimental foundation for establishing the mathematical model of the deformation diffusion-convection of soil.
作者
朱洵
王炼
王旭东
ZHU Xun;WANG Lian;WANG Xudong(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2018年第2期95-101,共7页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金(41272303)
江苏省六大人才高峰基金(09-F-004)
关键词
砂土
变形
扩散传播
模型试验
sand
deformation
diffusion-convection
model test
