土工基础

›› 2016, Vol. 30 ›› Issue (5): 604-607.

• 工程实录 • 上一篇    下一篇

桂林红粘土动剪切模量与阻尼比的试验研究

王 宗，王 勇   

  1. （桂林理工大学 广西岩土力学与工程重点实验室，广西桂林 541004）
  • 收稿日期:2015-11-25 修回日期:2015-12-15 出版日期:2016-10-20 发布日期:2016-10-31
  • 作者简介:王 宗（1990-），男，在读研究生，研究方向为岩土动力学、地基处理。

Experimental Studies on the Dynamic Shear Modulus and Damping Ratio of Guilin Red Clay

WANG Zong, WANG Yong   

  1. (Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin, 541004)
  • Received:2015-11-25 Revised:2015-12-15 Online:2016-10-20 Published:2016-10-31

摘要： 利用GDS动三轴仪，在应变控制条件下，对压实桂林典型红粘土进行固结不排水振动三轴试验。主要考虑了固结围压、固结应力比、压实密度和初始应变对红粘土动剪切模量和阻尼比的影响并分析其规律特性。结果显示：动剪切模量随振动应变的增大而减小，而随固结围压、固结应力比和压实密度的增大而增大；动剪切模量比随振动应变、固结围压和固结应力比的增大而减小，随压实密度的增大而增大；阻尼比是随振动应变、固结围压和固结应力比的增大而增大，在不同的振动应变幅值下表现不同大小。可用Hardin-Dmevich双曲线模型对动剪切应力和动剪切模量比进行很好的拟合。所得结果可为工程建设和场地地震反应分析提供一定的参考。

关键词: 动三轴, 动剪切模量, 动剪切模量比, 阻尼比, 动应变

Abstract: The dynamic properties of a typical compacted Guilin Red Clay were tested in GDS strained controlled cyclic triaxial apparatus under the consolidated undrained conditions. The factors that might potentially affect the dynamic shear modulus and damping ratio are consolidation pressure, consolidation stress ratio, degree of compaction and the initial strain. The influence of these factors are summarized. The results indicate that, the dynamic shear modulus reduces with the increase of cyclic strain and increases with the confining pressure, consolidation ratio and degree of compaction. The cyclic shear modulus ratio decreases with the increase of cyclic strain, confining pressure and consolidation stress ratio and increases with the degree of compaction of the sample. The damping ratio increases with the cyclic strain, confining pressure and consolidation stress ratio. The magnitude of the damping ratio is proportional to the cyclic strain magnitude. The cyclic shear stress and cyclic shear modulus ratio can be well fitted by the HardinDrinevich Hyperbolic Model.

Key words: Cyclic Triaxial Testing, Dynamic Shear Modulus, Dynamic Shear Modulus Ratio, Damping Ratio, Dynamic Shear Strain