长期循环荷载下土的动力学特性与本构模型研究进展

李琼林; 青于蓝; 崔凯; 张东杰; 李庞举

doi:10.3969/j.issn.0258-2724.20210928

长期循环荷载下土的动力学特性与本构模型研究进展

doi: 10.3969/j.issn.0258-2724.20210928

西南交通大学土木工程学院，四川成都 610031

基金项目: 国家自然科学基金（52178356, 42177128）

详细信息

作者简介:
李琼林（1986—），男，副教授，研究方向为土动力学与寒区岩土工程，E-mail：qionglin_li@swjtu.edu.cn

通讯作者:
崔凯（1979—），男，教授，博士生导师，研究方向为岩土工程，E-mail：cuikai@swjtu.cn

中图分类号: U461；TP308
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-16
- 修回日期: 2022-03-10
- 网络出版日期: 2023-09-15
- 刊出日期: 2022-03-14

Review of Dynamic Behaviors and Constitutive Model of Soil Under Long-Term Cyclic Loading

School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要:
随着交通基础设施的快速发展，长期循环荷载下土体的动力性能与相应的本构模型体系愈发受到关注，其能为该类荷载下地基或者岩土构筑物的动力稳定性和服役性能评估提供理论基础与技术支撑. 最近20年来，国内外相关学者已开展了大量的室内试验探索长期循环荷载下土的动力特性与影响因素，建立相应的理论模型描述土体的长期循环变形特征，并努力将其应用于工程实践. 目前，对长期循环荷载下土体动力学性能与主要影响因素的研究基本明确，但在如何减少本构模型参数，增强本构模型在变幅值、变频率等复杂实际工况时的适用性等研究尚需进一步加强. 本文通过对该方向研究发展的总结，明确了未来的发展方向，并提出了当前研究局限的可能解决思路，有利于进一步推进相关研究成果应用于工程实践的进程.
- 长期循环荷载 /
- 加载模式 /
- 累积应变 /
- 动态模量 /
- 本构模型
Abstract:
With the rapid development of transport infrastructure, the dynamic properties of soil under long-term cyclic loading and the corresponding constitutive model system are receiving increased attention, which can provide a theoretical basis and technical support for the assessment of the dynamic stability and service performance of foundations or geotechnical structures under such loading. In the past 20 years, Chinese and foreign scholars have carried out a large number of indoor experiments to explore the dynamic behaviors and influencing factors of soil under long-term cyclic loading, established corresponding theoretical models to describe the characteristics of long-term cyclic deformation of soil, and applied them to engineering practice. At present, the research on dynamic performance and the main influencing factors of soil under long-term cyclic loading is sufficient. However, how to reduce the parameters of these constitutive models and enhance their applicability in complex working conditions with variable amplitudes and frequencies needs to be further studied. Through the summary of research development, this paper clarified the development direction of this topic and proposed some possible solutions to the current research limitations, which was beneficial for applying research findings in engineering practice.
- long-term cyclic loading /
- loading modes /
- accumulative strain /
- dynamic modulus /
- constitutive model

HTML全文

图 1 循环荷载下土体累积应变发展模式分类^[12]

Figure 1. Classification of soil cumulative strain development modes under cyclic loading^[12]

下载: 全尺寸图片幻灯片

图 2 循环荷载下土体的累积应变

Figure 2. Accumulative strain of soil under cyclic loading

下载: 全尺寸图片幻灯片

图 3 土体p-q空间中的应力状态

Figure 3. Stress state of soil in p-q plane

下载: 全尺寸图片幻灯片

表 1 影响因素分类与表征指标

Table 1. Classification and characterization of influence factors

类别	考察指标
初始应力状态	主应力空间	围压${\sigma _3}$、轴向应力${\sigma _1}$、固结应力比$k = {{{\sigma _1}} \mathord{\left/ {\vphantom {{{\sigma _1}} {{\sigma _3}}}} \right. } {{\sigma _3}}}$
初始应力状态	$p {\text{-}} q$空间	初始平均主应力${p_0}$、初始剪应力${q_0}$、初始应力比${\eta _0} = {{{q_0}} / {{p_0}}}$
循环应力特征	加载频率、循环应力波形、循环应力幅值、循环应力的偏振、主应力轴旋转等
土的物理特征	土的类型与级配特征，土的颗粒骨架的组构形式，初始孔隙比（相对密实度、压实度），含水量（饱和度），温度（冻结与否）

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