个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:力学与航空航天学院
学科:工程力学. 岩土与环境力学. 计算力学
办公地点:工程力学系308室
联系方式:13942691028
电子邮箱:shaolt@dlut.edu.cn
Unloading Elastic Behavior of Sand in Cyclic Triaxial Tests
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论文类型:期刊论文
发表时间:2016-05-01
发表刊物:GEOTECHNICAL TESTING JOURNAL
收录刊物:SCIE
卷号:39
期号:3
ISSN号:0149-6115
关键字:cyclic triaxial tests; digital image technology; sand; stable state of deformation; Young's modulus
摘要:In this paper, digital image technology was used in the surface-deformation measurement of soil, making it possible to monitor the axial, radial, and volumetric deformations and the deformation distribution over the entire surface of specimens in triaxial tests. A series of cyclic triaxial tests on silica powder and Fujian sand were conducted to investigate the stress-strain behavior of sand in pre-failure deformation, particularly in the unloading elastic behavior. The sand gradually tended toward the stable state of deformation after it was subjected to a certain number of cyclic loadings. The sand appeared to be entirely nonlinear elastic, with unchanged and closed hysteresis loops of the stress-strain curve. In addition, the elastic parameters-Young's modulus and Poisson's ratio-of the specimens during the unloading process of the stable state of deformation were carefully studied. The test results suggested that the unloading tangent Young's modulus of sand was determined by the stress state and void ratio but was not affected by the stress amplitude of cyclic loading. However, Young's modulus depended more definitely on the axial stress than on the lateral stress when the deviatoric stress increment was applied in the triaxial stress condition. Moreover, the unloading average Poisson's ratio was dependent on the stress state and void ratio.