Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Study on SWCC and PSD evolution of compacted loess before and after drying-wetting cycles
https://orcid.org/0000-0001-5296-4045
Abstract Landslides and ground subsidence resulting from changes in soil-water characteristics during drying and wetting cycles present a severe hazard to the environment and human life in the Loess Plateau region of China. In this study, the soil-water characteristic curve (SWCC) evolution mechanism during drying and wetting cycles was carried out on compacted loess with various dry densities. The samples were subjected to three cycles of drying-wetting, and the change of matric suction was measured using the filter paper method. Additionally, nuclear magnetic resonance (NMR) technology was used to study the change in the pore size distribution (PSD) before and after the drying-wetting cycles. The results reveal that as the dry density increased, the saturated volumetric water content decreased, the SWCC slope gradually decreased, and the air entry value increased. Furthermore, the drying-wetting cycles increased the aggregated volume and macropore diameter, and their effect on SWCC intensified with dry density. Based on experimental observation, a simple method to calculate the surface relaxivity ($${\rho }_{2}$$) was proposed. Finally, the Weibull distribution function was innovatively applied to predict the PSD, achieving highly satisfactory accuracy. These results have practical implications for the construction and protection of loess engineering in the Loess Plateau region.
Study on SWCC and PSD evolution of compacted loess before and after drying-wetting cycles
https://orcid.org/0000-0001-5296-4045
Abstract Landslides and ground subsidence resulting from changes in soil-water characteristics during drying and wetting cycles present a severe hazard to the environment and human life in the Loess Plateau region of China. In this study, the soil-water characteristic curve (SWCC) evolution mechanism during drying and wetting cycles was carried out on compacted loess with various dry densities. The samples were subjected to three cycles of drying-wetting, and the change of matric suction was measured using the filter paper method. Additionally, nuclear magnetic resonance (NMR) technology was used to study the change in the pore size distribution (PSD) before and after the drying-wetting cycles. The results reveal that as the dry density increased, the saturated volumetric water content decreased, the SWCC slope gradually decreased, and the air entry value increased. Furthermore, the drying-wetting cycles increased the aggregated volume and macropore diameter, and their effect on SWCC intensified with dry density. Based on experimental observation, a simple method to calculate the surface relaxivity ($${\rho }_{2}$$) was proposed. Finally, the Weibull distribution function was innovatively applied to predict the PSD, achieving highly satisfactory accuracy. These results have practical implications for the construction and protection of loess engineering in the Loess Plateau region.
Study on SWCC and PSD evolution of compacted loess before and after drying-wetting cycles
https://orcid.org/0000-0001-5296-4045
Abstract Landslides and ground subsidence resulting from changes in soil-water characteristics during drying and wetting cycles present a severe hazard to the environment and human life in the Loess Plateau region of China. In this study, the soil-water characteristic curve (SWCC) evolution mechanism during drying and wetting cycles was carried out on compacted loess with various dry densities. The samples were subjected to three cycles of drying-wetting, and the change of matric suction was measured using the filter paper method. Additionally, nuclear magnetic resonance (NMR) technology was used to study the change in the pore size distribution (PSD) before and after the drying-wetting cycles. The results reveal that as the dry density increased, the saturated volumetric water content decreased, the SWCC slope gradually decreased, and the air entry value increased. Furthermore, the drying-wetting cycles increased the aggregated volume and macropore diameter, and their effect on SWCC intensified with dry density. Based on experimental observation, a simple method to calculate the surface relaxivity ($${\rho }_{2}$$) was proposed. Finally, the Weibull distribution function was innovatively applied to predict the PSD, achieving highly satisfactory accuracy. These results have practical implications for the construction and protection of loess engineering in the Loess Plateau region.
Study on SWCC and PSD evolution of compacted loess before and after drying-wetting cycles
Wang, Haiman (Autor:in) / Ni, Wankui (Autor:in) / Yuan, Kangze (Autor:in) / Nie, Yongpeng (Autor:in) / Li, Lan (Autor:in)
2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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