Characteristics of Shear Strength and Deformation of Compacted Q3 Loess

To explore the factors affecting the shear strength of compacted loess, direct shear tests and compression tests under different moisture contents and compaction were conducted. The results show that the angle of internal friction and the cohesion of the soil depend on the moisture content and compaction. The influence of the moisture content is more significant than that of the compaction. The relationship between the confined compression strain and vertical pressure can be fitted by a hyperbolic curve. The secant modulus has a positive linear relationship with the compaction, and a parabolic correlation with the moisture content. A modified formula for the deformation of loess under changing compaction and moisture content is presented.