[1]王建华,杨腾.k0固结饱和黏土的动剪模量与阻尼比[J].自然灾害学报,2018,27(06):001-9.[doi:10.13577/j.jnd.2018.0601]
 WANG Jianhua,YANG Teng.Cyclic shear modulus and damping ratio of k0 consolidated saturated clays[J].,2018,27(06):001-9.[doi:10.13577/j.jnd.2018.0601]
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k 0固结饱和黏土的动剪模量与阻尼比
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
27
期数:
2018年06期
页码:
001-9
栏目:
出版日期:
2018-12-28

文章信息/Info

Title:
Cyclic shear modulus and damping ratio of k0 consolidated saturated clays
作者:
王建华12 杨腾12
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
Author(s):
WANG Jianhua12 YANG Teng12
1. State Key Laboratory of Hydraulic Engineering Simulation and Safety of Tianjin University, Tianjin 300072, China;
2. Geotechnical Engineering Institute of Tianjin University, Tianjin 300072, China
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
Keywords:
cyclic shear modulusdamping ratiok0 consolidated claycyclic constitutive relationshipcyclic triaxial tests
分类号:
X43;X9;TU4;P315.93
DOI:
10.13577/j.jnd.2018.0601
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。
Abstract:
Effects of the initial effective mean stress, the initial shear stress and the cyclic stress history on the cyclic shear modulus and the damping ratio of k0 consolidated saturated clays are studied by cyclic triaxial tests. Following conclusions are obtained. The cyclic accumulative strain can be used as a state parameter to describe effect of the cyclic stress history on the cyclic shear modulus. The effects of the initial shear stress on the cyclic shear modulus and the damping ratio can be described by expressing the cyclic shear modulus and the damping ratio as variations with the cyclic shear strain. The effect of the initial effective mean stress can be considered by normalizing the relationship between the cyclic shear modulus and the cyclic shear strain using the maximum shear modulus associated with the relationship. Because effects of the initial effective mean stress, the initial shear stress and the cyclic stress history on the variation of the damping ratio with the cyclic shear strain are not obvious, it is considered that the damping ratio is only related with the cyclic shear strain. Therefore, variations of the cyclic shear modulus and the damping ratio with the initial effective mean stress, the initial shear stress, the cyclic stress history and the cyclic shear strain can be determined by a group of cyclic triaxial tests under a consolidation confining pressure and multi-stages cyclic triaixial test of a specimen under different confining pressure.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-09-10;改回日期:2018-10-12。
基金项目:国家自然科学基金项目(51579174)
作者简介:王建华(1955-),男,教授,主要从事土动力学与海洋岩土工程研究.E-mail:tdwjh@eyou.com
更新日期/Last Update: 1900-01-01