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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年04期

页码:

157-166

栏目:

岩土工程

出版日期:

2025-07-10

文章信息/Info

Title:

Study on dynamic characteristics of alluvial silty sand

文章编号:

1673-2049(2025)04-0157-10

作者:

岳夏冰¹,肖天鹏¹,陈炳旭²,王志丰¹

(1.长安大学 公路学院,陕西 西安 710064; 2. 中铁上海设计院集团有限公司,上海 200070)

Author(s):

YUE Xiabing¹, XIAO Tianpeng¹, CHEN Bingxu², WANG Zhifeng¹

(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Railway Shanghai Design Institute Group Corporation Limited, Shanghai 200070, China)

关键词:

洪积粉砂土;  累积塑性应变;  动三轴试验;  动弹性模量;  动强度

Keywords:

alluvial silty sand;  cumulative plastic strain;  dynamic triaxial test;  dynamic elasticity modulus;  dynamic strength

分类号:

TU411

DOI:

10.19815/j.jace.2023.12096

文献标志码:

A

摘要:

为探究洪积粉砂土填料的动力特性,考虑动应力幅值、含水率、围压和频率的影响进行了洪积粉砂土填料动三轴试验,研究了洪积粉砂土试样在不同影响因素下的动力变形规律,并建立了动弹性模量与动应变、动强度与循环次数的拟合曲线模型。结果表明:随着循环次数的增加,洪积粉砂土的累积塑性应变逐渐增大,加载初期累积塑性应变积累较快,但1 000次循环后保持相对稳定; 动弹性模量随着塑性变形的增加而发生衰减,围压和含水率对洪积粉砂土的动弹性模量影响较大,当围压越大且含水率接近最佳含水率时,动弹性模量越大; 阻尼比随着应变的增加呈非线性增长; 洪积粉砂土的动强度与围压呈正相关关系,而与循环次数呈负相关关系。

Abstract:

In order to explore the dynamic characteristics of alluvial silty sand filler, the dynamic triaxial test of alluvial silty sand filler was carried out considering the influence of dynamic stress amplitude, water content, confining pressure and frequency. The dynamic deformation law of alluvial silty sand samples under different influencing factors was studied, and the fitting curve models of dynamic elastic modulus and dynamic strain, dynamic strength and cycle times were established. The results show that with the increase of the number of cycles, the cumulative plastic strain of alluvial silty sand increases gradually, and the cumulative plastic strain accumulates rapidly at the initial stage of loading, but remains relatively stable after 1 000 cycles. The dynamic elastic modulus decreases with the increase of plastic deformation. The confining pressure and water content have a great influence on the dynamic elastic modulus of alluvial silty sand. When the confining pressure is larger and the water content is close to optimal water content, the dynamic elastic modulus is larger. The damping ratio increases nonlinearly with the increase of strain. The dynamic strength of alluvial silty sand is positively correlated with confining pressure and negatively correlated with the number of cycles.

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备注/Memo

备注/Memo:

收稿日期:2023-12-17
基金项目:国家重点研发计划项目(211221220042); 陕西省科技创新与攻关项目(2016NY-218)
作者简介:岳夏冰(1987-),女,工学博士,高级工程师,E-mail:yuexb@chd.edu.cn。
Author resume: YUE Xiabing(1987-), female, PhD, senior engineer, E-mail: yuexb@chd.edu.cn.

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更新日期/Last Update: 2025-07-10