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Multiscale characteristics of the wetting deformation of Malan loess in the Yan’an area,China 被引量:1
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作者 NAN Jing-jing PENG Jian-bing +2 位作者 ZHU Feng-ji ZHAO Jun-yan LENG Yan-qiu 《Journal of Mountain Science》 SCIE CSCD 2021年第4期1112-1130,共19页
Loess is prone to collapse upon wetting due to its open metastable structure,which poses a considerable threat to the environment,construction processes and human life.In this study,double oedometer tests and scanning... Loess is prone to collapse upon wetting due to its open metastable structure,which poses a considerable threat to the environment,construction processes and human life.In this study,double oedometer tests and scanning electron microscopy and mercury intrusion porosimetry analyses were conducted on loess from Yan’an to study the macroscopic and microscopic characteristics of loess wetting deformation and the underlying mechanism.The wetting collapse of loess under loading depends on the changes in different microstructure levels and elements.This collapse chain reaction is manifested by the dissipation,scattering and recombination of the cementation,deformation and reorganization of the particles,blocking of the pore channels,decrease in the dominant size and volume of unstable macropores(>14μm)and abundant mesopores(2.5-14μm),increase in the volume of small pores(0.05–2.5μm),and volume contraction at the macroscale.This process is dependent on the initial water content,stress level and wetting degree.These findings can facilitate collapsible loess hazard prevention and geological engineering construction. 展开更多
关键词 LOESS Macroscopic wetting deformation wetting collapse mechanism MICROSTRUCTURE Pore change
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