1.兰州交通大学土木工程学院, 甘肃 兰州 730070
2.中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃 兰州 730000
3.中国科学院大学,北京 100049
朱怀太(1997—),男,硕士研究生。主要从事寒区土体性能提升技术方面的研究。E-mail: zhu_at@163.com
欧尔峰(1979—),男,副教授,博士。主要从事隧道抗震方面的研究。E-mail: ouerf@163.com
收稿:2022-12-11,
修回:2023-02-15,
纸质出版:2024-06-25
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朱怀太,欧尔峰,姜琪等.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(03):715-724.
ZHU Huaitai,OU Erfeng,JIANG Qi,et al.Study on the Mechanical Properties and Mechanism Analysis of Loess Improved by Composite Phase Change Materials under Freeze‑thaw Conditions[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):715-724.
朱怀太,欧尔峰,姜琪等.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(03):715-724. DOI: 10.13409/j.cnki.jdpme.20221211003.
ZHU Huaitai,OU Erfeng,JIANG Qi,et al.Study on the Mechanical Properties and Mechanism Analysis of Loess Improved by Composite Phase Change Materials under Freeze‑thaw Conditions[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):715-724. DOI: 10.13409/j.cnki.jdpme.20221211003.
为降低冻融作用对黄土力学性能的劣化影响,基于相变材料的温度调控功能,提出了一种采用膨胀石墨‑正十四烷复合相变材料(EG‑C
14
)改良黄土的方法。以兰州黄土为研究对象,开展典型冻融循环后不同EG‑C
14
掺入比黄土试样的体积变形试验、力学性能试验和微观结构试验,探究冻融作用下不同EG‑C
14
掺量对黄土力学性能的影响规律及改良机理。试验结果表明:EG‑C
14
减缓了冻融循环过程中土体内部的温度变化,进而有效抑制了土体的胀缩变形;同时,EG‑C
14
降低了冻融循环对土体微观结构的损伤,与素黄土相比,多次冻融循环后改良土体内部的支架孔隙明显减少,颗粒骨架也更为密实,进而增强了土体的力学性能;此外,EG‑C
14
改良黄土的力学性能随EG‑C
14
掺量的增加先增大然后逐渐趋于稳定,且掺量为4%时改良效果最佳。
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-C
14
) was proposed
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-C
14
dosage levels. The study aimed to explore the influence of different EG-C
14
dosages on loess mechanical properties under freeze-thaw conditions and its enhancement mechanism. Results indicate that EG-C
14
effectively mitigated the temperature variations within the soil during freeze-thaw cycles
thereby suppressing soil expansion and contraction deformation. Additionally
EG-C
14
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 mechanical properties. Furthermore
EG-C
14
dosage positively correlated with enhanced mechanical properties
stabilizing notably at a 4% dosage. These findings offer valuable insights for deploying EG-C
14
enhanced
loess in practical applications.
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