Mechanical behavior of residual soils are studied by performing constant water content direct shear tests on reconstituted specimens using total stress analysis. The testing program involves initial degree of saturation (Sr) and applied normal stress as the control parameters. For three different soil samples, a total of 55 direct shear tests are conducted at Sr = 60%, 80%, and saturated conditions, in the normal stress range of 15–60 kPa. The results showed that shear strength increases with decreasing Sr and the relationship between shear strength and Sr is nonlinear. More dilative response is observed with decreasing Sr and decreasing applied normal stress. Maximum dilatancy and Sr relationship is nonlinear. At large displacements, samples prepared at different Sr levels showed similar ultimate shear resistances under similar applied normal stresses. It is concluded that Sr and applied normal stress dramatically influence the mechanical behavior of compacted residual soils studied.

通过使用总应力分析对再生标本进行恒定的含水量直接剪切试验，研究了残余土壤的力学行为。测试程序包括初始饱和度（Sr）和所施加的法向应力作为控制参数。对于三种不同的土壤样品，在15-60 kPa的正应力范围内，在Sr = 60％，80％和饱和条件下共进行了55次直接剪切试验。结果表明，剪切强度随Sr的降低而增加，且剪切强度与Sr的关系为非线性。随着Sr的减少和法向应力的减少，观察到更多的扩张反应。最大膨胀率和Sr关系是非线性的。大排量时 在不同的Sr含量下制备的样品在相似的法向应力下显示出相似的极限抗剪强度。结论是，Sr和施加的正应力极大地影响了所研究的压实残余土的力学性能。