[1]庄心善,彭承鸿.动荷载作用下膨胀土力学特性试验研究[J].长江大学学报(自然科学版),2021,18(2):118-126.
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动荷载作用下膨胀土力学特性试验研究
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长江大学学报（自然科学版）[ISSN:1673-1409/CN:42-1741/N]

卷:
18
期数:
2021年第2期
页码:
118-126
栏目:
建筑与土木工程
出版日期:
2021-03-25

文章信息/Info

文章编号:
1673-1409 (2021) 02-0118-09
作者:
庄心善;  彭承鸿
湖北工业大学土木建筑与环境学院, 湖北 武汉 430068
关键词:
土动力学;  动力特性;  动弹性模量;  阻尼比;  动三轴试验
分类号:
TU435
文献标志码:
A
摘要:
以合肥膨胀土为研究对象, 利用 GDS-AAT 型真/动三轴仪开展了不同参数下的膨胀土动力学试验研究,分析了围压、 固结比、 振动频率对土体动弹性模量和阻尼比影响规律。 结果表明, 在小应变幅值下, Kondner 模型能较好地描述动弹性模量倒数与动应变关系; 随着围压、 固结比、 振动频率的增大, 初始动弹性模量和动弹性模量均增大, 相同条件下, 动弹性模量随动应变增大而大幅度减小并趋于稳定; 不同围压、 固结比、 振动频率下动弹性模量比变化较小, 没有明显倾向性, 而阻尼比的变化较复杂, 与累积应变有关。 根据试验结果, 建立了初始动弹性模量关于围压和固结比的回归方程, 采用 Darendeli 模型得到膨胀土的动弹性模量比表达式, 提出运用关于应变的动弹性模量比多项式进行阻尼比曲线拟合回归分析。 拟合结果表明, 初始动弹性模量关于围压和固结比的回归方程能较好描述初始动弹性模量随围压和固结比的增长规律, 采用Darendeli 模型能较好地描述膨胀土的动弹性模量比随动应变的变化规律, 阻尼比可用动弹性模量比多项式来描述。

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更新日期/Last Update: 2021-03-25