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Volume 44 Issue 11
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ZHANG Yu-wei, SONG Zhan-ping, XIE Yong-li. Prediction model for soil-water characteristic curve of loess under porosity change[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(11): 2017-2025. DOI: 10.11779/CJGE202211007
Citation: ZHANG Yu-wei, SONG Zhan-ping, XIE Yong-li. Prediction model for soil-water characteristic curve of loess under porosity change[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(11): 2017-2025. DOI: 10.11779/CJGE202211007
shu

Prediction model for soil-water characteristic curve of loess under porosity change

  • 1.

    School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

  • 2.

    Shaanxi Key Laboratory of Geotechnical and Underground Space, Xi'an University of Architecture and Technology, Xi'an 710055, China

  • 3.

    School of highway, Chang'an University, Xi'an 710064, China

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  • Received Date: September 05, 2021
  • Available Online: December 08, 2022
    Graphical Abstract
    • Abstract
  • The loess has obvious macropore structure. The internal pores change continuously in the process of water immersion and collapsibility, resulting in the dynamic change of soil-water characteristic curve in the process of water immersion. In order to simply predict the soil-water characteristic curve of loess under different pore conditions, taking the pore volume function as the breakthrough point, assuming the influence law of the change of soaking pore on the pore volume function, and introducing the translation factor ξ1i and the compression factor ξ2i, the relationship among the translation factor, the compression factor and the pore index e is established through the average pore radius, and the different pores are derived based on the initial pore state. Based on the Gardner model and introducing the pore index, the model for the soil-water characteristic curve of loess considering the change of soaking pore is established. When the influences of pore change are not considered, the model degenerates to the Gardner model. The model contains six parameters, which can be determined by experiments. The parameters of the model are calibrated by the initial state, and the soil-water characteristic curve of loess with pore change is predicted. The combination shows that the predicted results by the model are in good agreement with the test ones. The evolution law of the soil-water characteristics of loess under different conditions of water soaked pore changes can be accurately predicted by using this model, which may provide preference for establishing the constitutive model for loess.
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