The thicknesses of bound water film of Late Pleistocene loess and paleosol in Weibei,Shaanxi Province,were studied based on nuclear magnetic resonance,specific surface area tests,and theoretical analysis to comprehensively analyze the influencing factors of the engineering properties of loess and paleosol.Experimental results show that the thickness of the bound water film of loess is larger than that of paleosol,and a considerable difference is observed between their thicknesses.This difference can be attributed to the smaller pore volume and size of paleosol than those of loess,while the content of high-valence cations in paleosol is greater than that in lo-ess.In addition,the surface of paleosol particles is distributed with an iron-manganese film;therefore,its hydrophilicity is weak.The relationship between bound water film and engineering characteristics of loess,such as collapsibility and rebound deformation,was analyzed.The col-lapsibility of loess-paleosol increases with the thickness of bound water film and decreases with the thickness of bound water film.The thickness of the bound water film is positively correlated with the unloading deformation coefficient.Comprehensive analysis shows that the variations in high-valence cation content,particle surface characteristics,and porosity contribute to the differ-ence in bound water film thickness between loess and paleosol.This phenomenon leads to differ-ences in engineering properties,such as collapsibility between loess and paleosol.
loess-paleosolnuclear magnetic resonancethickness of bound water filmion exchangecollapsibility
万方数据
维普
