Dynamic deformation characteristics of EPS particles lightweight soil based on Davidenkov model

IF 2.2 4区工程技术 Q3 ENGINEERING, GEOLOGICAL

Environmental geotechnics Pub Date : 2024-06-11 DOI:10.1680/jenge.23.00065

Yi-xiang Cui, Tian-shun Hou, S. Pamukcu, Yu-xin Niu

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引用次数: 0

Abstract

The dynamic deformation characteristics of lightweight soil is studied using consolidated undrained dynamic triaxial tests to predict its nonlinear stress and strain behavior under traffic load. The results showed that the influence of confining pressure on attenuation of the dynamic shear modulus ratio became significant with increasing EPS (expanded polystyrene) particle content or the cement content. The attenuation curve of the dynamic shear modulus ratio was evaluated using Davidenkov model parameters, A, B and γ 0. It was proved that parameter A was mostly affected by EPS particle content and confining pressure with its value ranging between 1.1 and 1.85. The parameter γ 0 was affected by cement content and confining pressure, and its value ranged between 0.0007 and 0.0016. The parameter B was found to range between 0.38 and 0.55, in general. The relationship curves between damping ratio and dynamic shear strain revealed two forms, S-shaped and bell-shaped. The verification tests showed that Davidenkov model could predict accurately the dynamic deformation characteristics of lightweight soil both under changing stress state and under constant gradient loading conditions. These results provide a theoretical basis for determining deformation of a lightweight soil subgrade under traffic load.

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基于 Davidenkov 模型的 EPS 颗粒轻质土壤动态变形特性

利用固结不排水动态三轴试验研究了轻质土的动态变形特性，以预测其在交通荷载作用下的非线性应力和应变行为。结果表明，随着 EPS（发泡聚苯乙烯）颗粒含量或水泥含量的增加，约束压力对动剪模量比衰减的影响变得显著。使用戴维延科夫模型参数 A、B 和 γ 0 对动态剪切模量比衰减曲线进行了评估，结果证明参数 A 主要受 EPS 颗粒含量和密闭压力的影响，其值在 1.1 至 1.85 之间。参数 γ 0 受水泥含量和密闭压力的影响，其值介于 0.0007 和 0.0016 之间。参数 B 一般介于 0.38 和 0.55 之间。阻尼比与动态剪切应变之间的关系曲线显示出两种形式，即 S 形和钟形。验证试验表明，Davidenkov 模型可以准确预测轻质土在应力状态变化和恒定梯度加载条件下的动态变形特性。这些结果为确定轻质土路基在交通荷载作用下的变形提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental geotechnics Environmental Science-Water Science and Technology

CiteScore

6.20

自引率

18.20%

发文量

期刊介绍： In 21st century living, engineers and researchers need to deal with growing problems related to climate change, oil and water storage, handling, storage and disposal of toxic and hazardous wastes, remediation of contaminated sites, sustainable development and energy derived from the ground. Environmental Geotechnics aims to disseminate knowledge and provides a fresh perspective regarding the basic concepts, theory, techniques and field applicability of innovative testing and analysis methodologies and engineering practices in geoenvironmental engineering. The journal''s Editor in Chief is a Member of the Committee on Publication Ethics. All relevant papers are carefully considered, vetted by a distinguished team of international experts and rapidly published. Full research papers, short communications and comprehensive review articles are published under the following broad subject categories: geochemistry and geohydrology, soil and rock physics, biological processes in soil, soil-atmosphere interaction, electrical, electromagnetic and thermal characteristics of porous media, waste management, utilization of wastes, multiphase science, landslide wasting, soil and water conservation, sensor development and applications, the impact of climatic changes on geoenvironmental, geothermal/ground-source energy, carbon sequestration, oil and gas extraction techniques, uncertainty, reliability and risk, monitoring and forensic geotechnics.