岩土工程学报2011，Vol.33Issue(1)：81-87,7.
基于数字图像技术的砂土液化可视化动三轴试验研究
Visualized cyclic triaxial tests on sand liquefaction using digital imaging technique
摘要
Abstract
A modified CKC cyclic triaxial apparatus is used to monitor the evolution of granular soil microstructures during cyclic triaxial tests. Micro digital screening techniques are used to capture the change of microstructures of sand samples during liquefaction induced by cyclic loading. Digital images at certain stages of the tests are cut from the videos and further processed by self-developed software named GeoDIP. The microfabric evolutions including particle orientation, contact normal and number of contacts are analyzed. Labeled particles are traced to study the micro mechanism of soil deformation. It is found that there is no preferred orientation of the long axes of particles in liquefied samples. The main direction of contact normal between particles orients vertically whether the sample is liquefied or not. The samples experience a significant loss of contact number during liquefaction, but the number regains a lot after post-liquefaction drainage. Soil particles exhibit obvious translational motion before liquefaction, but start to move relatively and rotate when liquefaction occurs. The results of this study can not only explore the micro mechanism of sand liquefaction, but also provide an experimental basis for numerical modeling of sand liquefaction.关键词
砂土液化/可视化动三轴试验/细观结构/组构各向异性/颗粒旋转Key words
sand liquefaction/ visualized cyclic triaxial test/ microstructure/ fabric anisotropy/ particle rotation分类
建筑与水利引用本文复制引用
周健,史旦达,吴峰,薛剑峰..基于数字图像技术的砂土液化可视化动三轴试验研究[J].岩土工程学报,2011,33(1):81-87,7.基金项目
国家自然科学基金项目(90815008,50909057) （90815008,50909057）
同济大学岩土及地下工程教育部重点实验室开放基金项目(KLE-TJGE-0904) （KLE-TJGE-0904）
