非饱和黄土中的吸力与有效应力

The Suction and Effective Stress of Unsaturated Loess

用压力板法和回归分析法研究了基质吸力对非饱和黄土强度性质的影响。结果表明，非饱和黄土的基质吸力与饱和度在双对数座标上呈直线关系；起始基质吸力与液限、塑性指数及粘粒含量呈线性规律变化；有效应力影响系数与其起始基质吸力呈线性关系，且随粘粒含量的增大而增大。

The effect of the matrix suction on the unsaturated loess strength is studied by means of pressure board and regressive analysis.The result illustrates a linear relationship between the matrix susction of unsaturated loess and the saturation degree in the double logarithimic coordinate.The first matrix suction is changed along with liquid limit,plasticity index and clay pellet content in a manner of linear regularity.The effective coefficient of effective stress has a linear relationship with the first matrix suction,and it increases with the increment of the clay pellet content.