Multiscale evaluation of the structural characteristics of intact loess subjected to wet/dry cycles

Liu, Kuan; Ye, Wanjun; Jing, Hongjun

doi:10.1007/s11069-023-06253-x

Cited by 7 publications

(2 citation statements)

References 76 publications

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“…Existing experiments and relevant literature on the influence of dry-wet cycles on loess disintegration reveal that dry-wet cycles affect the structural stability of the soil by altering grain size distribution, pore structure characteristics, grain arrangement, bonding mode, and the state of soluble salts in the soil, in turn affecting its disintegration [104,105].…”

Section: Microstructural Analysis Of Loess Disintegration Under Freez...mentioning

confidence: 99%

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Chen,

Li,

Wang

et al. 2024

Sustainability

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Loess disintegration is a significant physicochemical and mechanical dissolution process that occurs when loess comes into contact with water. This phenomenon contributes to geological disasters such as loess cave erosion, landslides, and debris flows. The disintegration of loess can be influenced by both internal and external factors. Research on internal factors of loess disintegration has been widely recorded, but the research progress on external environmental factors that affect loess disintegration is not well summarized. This review summarizes the impacts of external water environmental factors on loess disintegration and reveals that six external water environmental factors, namely the temperature of the aqueous solution, hydrodynamic conditions, solution pH, salt concentration and type in the solution, freeze–thaw cycles, and dry–wet cycles, can significantly impact loess disintegration. Furthermore, this review delves into three key research areas in loess disintegration under the influence of these water environmental factors: experimental research on loess disintegration, the disintegration parameters used in such research and their variations, and the water–soil chemical reactions and microstructural changes during loess disintegration. It concludes that current experimental research on loess disintegration suffers from inadequate studies, with existing research associated with poor comparability and weak representativeness, and a lack of comprehensive, systematic analysis of its regularities of influence and response mechanisms from both microscopic and macroscopic perspectives. This paper can provide valuable insights for the prevention of loess geological disasters and engineering safety construction.

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Section: Microstructural Analysis Of Loess Disintegration Under Freez...mentioning

confidence: 99%

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Chen,

Li,

Wang

et al. 2024

Sustainability

View full text Add to dashboard Cite

show abstract

“…The mineral composition and micro-particles of the intact loess undergo physical and chemical reactions after being upon immersion in water. Under the alternating effects of rainfall and evaporation, the physical and mechanical properties of the loess deteriorate 5 . The original stable structure is damaged, and the strength of the soil rapidly decreases 6 .…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of influence of amide polymer on loess for subgrade

Yue,

Zhang,

Zhang

et al. 2024

Sci Rep

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The effects of moisture and drying shrinkage can lead to uneven settlement, cracking, and other diseases in loess subgrade. The objective of this study was to investigate the effects of amide polymer (AP) on the permeability, mechanical properties and crack resistance of loess by orthogonal experiments. The basic properties of AP and the permeability, mechanical properties, and dry–wet variation properties of polymer-modified loess were tested, and a scale model verification and simulation analysis were conducted. In this paper, water migration in subgrade is regulated by improving the water sensitivity of loess. By reducing the variation range of subgrade water content, the stress accumulation in subgrade caused by water is weakened. The results show that the curing time and mechanical properties of AP are directly affected by the oxidant and reducing agent, and the mechanical properties of AP are compatible with the characteristics of loess. AP filled the grain gap and reduced the permeability of loess by 34.05–280.83%. The ductility of polymer-modified loess is significantly increased, and the strain of peak strength is increased by 17.21–126.36%. AP can regulate moisture change, reduce the surface tension between particles, and reduce stress concentration. The strength loss rate was reduced by 19.98–51.21% by enhancing the cracking resistance and weakening the strength loss caused by dry and wet cycling. The increase of upper layer moisture content in the scale model of polymer-modified loess subgrade is reduced by 31.38–36.11%.

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Microscopic mechanisms of shear strength variation in acid- and alkali-contaminated loess

Liu,

Ye,

Long

2023

Environ Earth Sci

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Multiscale evaluation of the structural characteristics of intact loess subjected to wet/dry cycles

Cited by 7 publications

References 76 publications

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Experimental investigation of influence of amide polymer on loess for subgrade

Microscopic mechanisms of shear strength variation in acid- and alkali-contaminated loess

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