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Fractional-order constitutive model of loess creep incorporating microstructural damage under seepage-stress coupling effect

文献类型：期刊论文

作者Chang, Zhou6,7; Yan, Changgen6,7; Lan, Hengxing1,5; Qi, Shengwen2,3,4; Bao, Han6,7; Shi, Yuling1; Sun, Weifeng1
刊名ENGINEERING GEOLOGY
出版日期2025-10-01
卷号357页码:108350
关键词Loess Creep Seepage-stress coupling Microstructure evolution Fractional derivative Damage constitutive model
ISSN号0013-7952
DOI10.1016/j.enggeo.2025.108350
产权排序2
文献子类Article
英文摘要The permeability evolution and creep damage mechanisms of loess under seepage-stress coupling are crucial for evaluating its long-term stability in complex hydrogeological environments. This study conducted seepage-creep tests on loess samples under varying seepage pressures (au) and confining pressures (a3) to analyze creep behavior and permeability. Scanning electron microscopy was performed before and after creep tests to observe microstructural evolution and reveal microscopic mechanisms of loess creep under seepage-stress coupling. Results indicate that seepage pressure and confining pressure competitively regulate loess creep. au/a3 exhibits an exponential negative correlation with creep failure time(tc) and a linear positive correlation with the creep-to-instant strain ratio (epsilon creep/epsilon instant) at critical deviatoric stress. Loess permeability exhibits dual-phase evolution characterized by steady fluctuations-critical breakthrough. au/a3 shows an exponential negative correlation with inflection-point permeability and significantly shortens the time to reach this inflection point. Increased a3 compresses macropores and mesopores, dispersing pore directivity and increasing fractal dimension. Conversely, increased au enhances the suffusion, triggering cascading expansion from small pores to mesopores to macro-pores. This promotes pore directivity and abundance while reducing fractal dimension. Dynamic competition between mechanical constraint and hydraulic erosion during microstructural evolution highlights the antagonism of au and a3 on loess creep behavior and permeability. A new nonlinear creep damage constitutive model was developed to describe loess creep under seepage-stress coupling. This model incorporates the damage variable and fractional-order derivative. Theoretical predictions align closely with experimental data. These findings advance understanding of loess creep mechanisms under stress-seepage coupling and provide a reference for evaluating long-term stability of loess engineering in complex hydro-mechanical environments.
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WOS关键词PERMEABILITY ; DEGRADATION ; MECHANISM ; AREA ; SOIL
WOS研究方向Engineering ; Geology
语种英语
WOS记录号WOS:001583646300005
出版者ELSEVIER
源URL[http://ir.igsnrr.ac.cn/handle/311030/217464]  
专题资源与环境信息系统国家重点实验室_外文论文
通讯作者Yan, Changgen
作者单位1.Changan Univ, Sch Geol Engn & Geomat, Xian 710054, Shaanxi, Peoples R China;
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China;
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 10029, Peoples R China;
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China;
5.Inst Geog Sci & Nat Resources Res, Chinese Acad Sci, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China;
6.Changan Univ, Sch Highway, Middle Sect South Ring Rd 2, Xian 710064, Shaanxi, Peoples R China;
7.Xian Key Lab Geotech Engn Green & Intelligent Tran, Xian 710064, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Chang, Zhou,Yan, Changgen,Lan, Hengxing,et al. Fractional-order constitutive model of loess creep incorporating microstructural damage under seepage-stress coupling effect[J]. ENGINEERING GEOLOGY,2025,357:108350.
APA Chang, Zhou.,Yan, Changgen.,Lan, Hengxing.,Qi, Shengwen.,Bao, Han.,...&Sun, Weifeng.(2025).Fractional-order constitutive model of loess creep incorporating microstructural damage under seepage-stress coupling effect.ENGINEERING GEOLOGY,357,108350.
MLA Chang, Zhou,et al."Fractional-order constitutive model of loess creep incorporating microstructural damage under seepage-stress coupling effect".ENGINEERING GEOLOGY 357(2025):108350.

入库方式： OAI收割

来源：地理科学与资源研究所

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