非饱和黄土土水特性与湿陷性关系分析

黄土的湿陷并不是饱和状态，即吸力为零时黄土所表现出的特性，而是受其含水状态,即吸力的显著影响。室内外的试验研究表明，在竖向应力不变的情况下，含水量的增加或吸力的减少会引起非饱和黄土的湿陷。利用压力板仪测试了非饱和原状黄土的土水特征曲线，采用非饱和土三轴仪得到相应土的湿陷变形，分析了土水特性曲线对原状黄土湿陷变形的影响。结果表明，非饱和黄土的渐变湿陷特性和土水特性曲线的形式和参数之间存在密切关系。本文的分析为采用类似土水特性曲线的预测模型来预测非饱和黄土随吸力变化的湿陷系数奠定了基础。

Analysis on Relationship Between Collapsibility and Soil-Water Characteristics of Undisturbed Loess

Under the constant vertical stress, the increase of water content or reduction of suction can cause loess collapse. Using the pressure plate extractor and GDS, soil water characteristic curves and coefficient of collapsibility of unsaturated loess are obtained, respectively. In this pa- per we analyze the influence of soil water characteristic curve of undisturbed loess collapsibility deformation. The results indicate some features of the gradual collapse behavior of the loess and its relationship with the form and parameters of soil - water characteristic curves. The results of- fer a basis for predicting the loess collapse coefficient with the change of suction using prediction model similar to soil -water characteristic curves obtained in this paper.