k0固结饱和黏土的动剪模量与阻尼比

王建华1,2 杨腾1,2

(1.天津大学水利工程仿真与安全国家重点实验室, 天津 300072)
(2.天津大学岩土工程研究所, 天津 300072)

【摘要】通过k0固结不排水动三轴试验, 研究了初始有效平均应力、初始剪应力以及振动应力历史对k0固结饱和黏土动剪模量和阻尼比的影响。结果表明, 可以将振动累积应变作为反映振动应力历史影响的状态参数;将同一状态参数下的动剪模量表示为随动剪应变的变化关系可以反映初始剪应力对动剪模量和阻尼比的影响;依据不同状态参数对应的最大动剪模量确定规一化动剪模量随动剪应变的变化关系可以反映初始有效平均应力的影响。初始有效平均应力、初始剪应力以及振动应力历史对阻尼比随振动剪应变的变化关系影响较小, 可以认为阻尼比随振动剪应变有唯一变化关系。因此, 通过一个固结压力下的一组振动三轴试验, 结合一个试样在不同振动累积应变与不同初始有效平均应力下的多级振动三轴试验, 就可以建立反映初始有效平均应力、静偏应力与振动应力历史影响的k0固结饱和粘土动剪模量与阻尼比变化关系。

【关键词】 动剪模量; 阻尼比; k0固结黏土; 动本构关系; 动三轴试验;

【DOI】

【基金资助】 国家自然科学基金项目 (51579174) National Natural Science Foundation of China (51579174)

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This Article

ISSN:1004-4574

CN: 23-1324/X

Vol 27, No. 06, Pages 1-9

December 2018

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Article Outline

摘要

  • 1 振动三轴试验
  • 2 确定动剪模量和阻尼比的方法
  • 3 k0固结饱和黏土动剪模量变化关系
  • 4 k0固结饱和黏土阻尼比变化关系
  • 5 结语
  • 参考文献