含水率对滑带土强度及变形影响试验研究

为了研究含水率对滑带土强度及变形特性的影响，选取某大型滑坡滑带土进行不同初始饱和度的常规三轴固结排水（气）剪切试验，采用了一种新型气水转换的外体变测试装置来研究非饱和土体变。研究成果表明，含水率对滑带土强度有很大的影响，初始饱和度越高，强度值越低，凝聚力c与饱和度呈阶梯状陡降关系，内摩擦角? 可以与初始饱和度建立线性关系式；含水率越高，土样体变越小，Duncan-Chang模型参数K、Kb、G受含水率影响较大，与初始饱和度呈线性变化关系；n、m、F、Rf、D受含水率的影响较小，不同初始饱和度下的参数值相差不大，可取平均值作为不同饱和度下的模型参数。

Experimental study of relationship between water content and strength or deformation of slip soil

In order to study the influence of water content on the strength and deformation of slip soil, select a large scale landslide’s slip soil is selected to conduct consolidated-drained triaxial shear test with different initial saturations. Study the volume strain of unsaturated soils is studied by adopting a new gas and water converting device. The results show that the water content has great influences on the strength of slip soil; the higher the initial saturation is, the lower the strength value is. Strength parameter c with saturation is the ladder-like drop relationship; and linear relation could be established between strength parameters ? and initial saturation. The higher water content is, the smaller the soil sample’s volume deformation is; and the parameters of Duncan-Chang model such as K, Kb, and G are affected largely by water content; and then the linear formula could be established between the initial saturation and these parameters of Duncan-Chang model. But other parameters of Duncan-Chang model such as n, m, F, Rf, and D, which are little affected by water content, have little difference value under different initial saturations, so the averages are made as the model parameters under different saturations.