Abstract: Based on the long-term monitoring data of the foundation pit of Golden City Square project in Shenyang， the horizontal displacements and deformations on the pile top and in the pile body， as well as the prestress in the anchors were analyzed in order to understand the mechanical characteristics and deformation laws in the pile-anchor support system. Results showed that time effect of deformation in the support system of the foundation pit is not significant in sandy layer. However the spatial effect of the horizontal displacements on the pile top is significant. The horizontal displacements of the pile body take on a fish belly shape with small values at the two ends and large values in the middle. Due to the effect of the prestress in the anchor， the deformation curve of the pile body is similar to that of a simply supported beam. Anchors are significantly affected by seasonal frost heavy， whose influence is gradually reduced from top to bottom. The 600mm diameter supporting piles in the pile-anchor support system are capable of controlling the deformation， thus being feasible in this project and having a broad application prospect.

Key words: pile-anchor support, deformation, sandy layer, frost heavy, spatial effect