Based on the assumption that loess is an elastic-perfectly plastic material which obeys Mohr-Coulomb yield condition and the anchor plate is a rigid body, a three-dimensional numerical analysis model is established by use of the finite-difference software FLAC^3D and the anchor-soil interaction is then simulated. The deformation mechanism of loess around plate anchors during uplifting is analyzed by the contact plane element. The influencing factors including depth ratio, loess shear strength parameter, shape and size of anchor plate are considered in the ultimate pull-out capacity analysis. It is found that the ultimate pull-out capacity of anchor plate is jointly influenced by these factors. It increases with the increased depth ratio and loess shear strength, however the influencing extent is different. Expanding the plate size can increase the total capacity, but the capacity per unit area will decrease. For plates of same area, the circular one has the biggest ultimate pull-out capacity while the square takes the second. The coefficient of a rectangle plate decreases when the length-width ratio increases. The rules revealed by this study have a reference value for the study and promotion of combined cable-slab foundation in loess areas.

combined cable-slab foundation  /  ultimate pull-out capacity  /  three-dimensional numerical analysis model