冻融循环作用下黄土基水泥土三轴压缩力学特性及本构模型研究

doi:10.11896/cldb.24100069

材料导报

2025, Vol. 39

Issue (21): 24100069-8 https://doi.org/10.11896/cldb.24100069

无机非金属及其复合材料

冻融循环作用下黄土基水泥土三轴压缩力学特性及本构模型研究

殷溥隆¹, 李艳^1,*, 田勇², 翟越¹, 李乐¹, 何峻宇¹, 贾宇¹, 程禹翰^1,3

1 长安大学地质工程与测绘学院,西安 710064
2 中建三局集团有限公司,西安 710075
3 中交第一公路勘察设计研究院有限公司,西安 710068

Study on Triaxial Compressive Mechanical Properties and Constitutive Model of Loess-based Cemented Soil Under Freeze-Thaw Cycle

YIN Pulong¹, LI Yan^1,*, TIAN Yong², ZHAI Yue¹, LI Le¹, HE Junyu¹, JIA Yu¹, CHENG Yuhan^1,3

1 College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710064, China
2 China Construction Third Bureau Group Co., Ltd., Xi’an 710075, China
3 CCCC First Highway Consultants Co., Ltd., Xi’an 710068, China

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摘要黄土在我国西北地区广泛分布,黄土基水泥土是我国绿色施工与减碳目标下固废资源化的新型水泥土。为研究冻融循环作用后黄土基水泥土力学性能的劣化规律,针对不同冻融循条件下的黄土基水泥土开展三轴压缩试验,分析冻融循环次数和围压的影响;利用扫描电镜和核磁共振技术,揭示黄土基水泥土的强度形成机制及冻融损伤演化机理。在此基础上,基于统计损伤力学理论,推导建立了综合考虑冻融循环作用及围压效应的黄土基水泥土三轴本构模型。研究结果表明:黄土基水泥土三轴压缩破坏模式分为“Y”型剪切破坏、类“X”共轭型压-剪切带破坏和“H”型剪切-劈裂带破坏三种类型,且随着冻融循环次数的增加,破坏性质由脆性逐渐向延性转变。冻融循环作用对黄土基水泥土内摩擦角的影响较小,主要通过劣化粘聚力降低剪切强度。冻融损伤的本质在于内部水相变作用产生的冻胀力使C-S-H凝胶的胶结力减弱,试样内部介孔和大孔数量不断增加,孔隙相互连通、扩大直至贯穿。构建的黄土基水泥土三轴损伤本构模型综合考虑了冻融循环作用和围压效应,表达式简单、参数物理意义明确,可较好地推求冻融环境下黄土基水泥土的全应力-应变曲线,并能准确地描述峰后应变软化特征。

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	程禹翰

关键词: 黄土基水泥土冻融循环作用围压力学特性本构模型统计损伤力学

Abstract: Loess is widely distributed in northwest China. Loess-based cemented soil is a new type of solid waste resource under green construction and carbon reduction goal in China. In order to study the deterioration of mechanical properties of loess-based cemented soil after freeze-thaw cycles, triaxial compression tests were carried outon loess-based cemented soil under different freeze-thaw cycles to analyze the effects of freeze-thaw cycles and confining pressures on their compressive strength. Using scanning electron microscopy and nuclear magnetic resonance techniques, the formation mechanism of strength and evolution mechanism of freeze-thaw damage of loess-based cemented soil were revealed. Then based on the theory of statistical damage mechanics, a triaxial constitutive model for loess-based cemented soil was derived considering the effects of freeze-thaw cycles and confining pressure. The results show that the triaxial compression failure modes of loess-based cemented soil are divided into “Y” shear failure, “X” conjugated compression-shear zone failure and “H” shear-fracture zone failure. With the increase of freeze-thaw cycles, the failure properties gradually change from brittle to ductile. The freeze-thaw cycle mainly reduces the shear strength by deteriorating the cohesion, while has little effect on the internal friction angle of loess-based cemented soil. The essence of freeze-thaw damage is that the frost swelling force generated by the internal water phase transition weakens the cementing force of C-S-H gel, and the internal pore size increase continuously, and the internal pores of the sample are interconnected, expanded and penetrated. The triaxial damage constitutive model for loess-based cemented soil derived comprehensively considers the effects of freeze-thaw cycles and confining pressure, and its expressions are simple and its parameters have clear physical meanings, enabling a good representation of the full stress-strain curve of cemented loess under freeze-thaw conditions and accurately describing the post-peak strain softening characteristics.

Key words: loess-based cemented soil freeze-thaw cycles confining pressure mechanical property constitutive model statistical damage mechanics

出版日期: 2025-11-10 发布日期: 2025-11-10

ZTFLH:

TU411

基金资助: 国家自然科学基金—联合基金项目(023A2047);咸阳市科技创新团队项目(L2023CXNLCXTD005);陕西省住建厅项目(2021-K40)

通讯作者: *李艳,博士,长安大学地质工程与测绘学院副教授、硕士研究生导师。长期从事岩石和混凝土材料力学性能等方面的研究。1259578602@qq.com

作者简介: 殷溥隆,长安大学地质工程与测绘学院硕士研究生,在李艳副教授的指导下进行研究。目前主要研究领域为岩土力学特性等。

引用本文:

殷溥隆, 李艳, 田勇, 翟越, 李乐, 何峻宇, 贾宇, 程禹翰. 冻融循环作用下黄土基水泥土三轴压缩力学特性及本构模型研究[J]. 材料导报, 2025, 39(21): 24100069-8.
YIN Pulong, LI Yan, TIAN Yong, ZHAI Yue, LI Le, HE Junyu, JIA Yu, CHENG Yuhan. Study on Triaxial Compressive Mechanical Properties and Constitutive Model of Loess-based Cemented Soil Under Freeze-Thaw Cycle. Materials Reports, 2025, 39(21): 24100069-8.

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https://www.mater-rep.com/CN/10.11896/cldb.24100069 或 https://www.mater-rep.com/CN/Y2025/V39/I21/24100069

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