防灾减灾工程学报2024，Vol.44Issue(3)：715-724,10.DOI:10.13409/j.cnki.jdpme.20221211003
冻融作用下复合相变材料改良黄土力学特性研究及机理分析
Study on the Mechanical Properties and Mechanism Analysis of Loess Improved by Composite Phase Change Materials under Freeze-thaw Conditions
摘要
Abstract
To mitigate the detrimental impact of freeze-thaw cycles on loess mechanical properties,a method using expanded graphite-n-tetradecane composite phase change material(EG-C14)was pro-posed,leveraging the temperature modulation capability of phase change materials.Focusing on the Lanzhou loess,a series of tests were conducted after typical freeze-thaw cycles,including volumetric deformation tests,mechanical property tests,and microstructure tests on loess samples with varying EG-C14dosage levels.The study aimed to explore the influence of different EG-C14 dosages on loess mechanical properties under freeze-thaw conditions and its enhancement mechanism.Results indicate that EG-C14 effectively mitigated the temperature variations within the soil during freeze-thaw cycles,thereby suppressing soil expansion and contraction deformation.Additionally,EG-C14 minimized soil microstructure damage during freeze-thaw cycles.Enhanced soil exhibited reduced scaffold porosity and denser particle skeleton compared to untreated loess after multiple cycles,thus improving its me-chanical properties.Furthermore,EG-C14 dosage positively correlated with enhanced mechanical prop-erties,stabilizing notably at a 4％dosage.These findings offer valuable insights for deploying EG-C14 enhanced loess in practical applications.关键词
冻融作用/黄土/复合相变材料/力学特性/机理分析Key words
freeze-thaw/loess/composite phase change material/mechanical properties/mechanism analysis分类
建筑与水利引用本文复制引用
朱怀太,欧尔峰,姜琪,赵永春,赵建沅..冻融作用下复合相变材料改良黄土力学特性研究及机理分析[J].防灾减灾工程学报,2024,44(3):715-724,10.基金项目
国家自然科学基金(52168058)、第八批甘肃省科技计划(21ZD8JA003)资助 （52168058）
