Abstract: Large slip often occurs in deep soft soil during large area filling or excavation, which brings great difficulty to the analysis of anti-sliding pile considering pile-soil interaction. For this purpose, a modified cantilever pile method was proposed to overcome the problem in the calculation of the existing cantilever pile method considering the sliding behavior of deep soft soil layer. The soil pressure of the pile passive loading segment adopts an isosceles triangle distribution, and the maximum value is identical to the ultimate lateral soil pressure. The soft soil around the pile anchorage segment is assumed as ideal elastic-plastic to consider the large displacement of the soft soil. In addition, the displacement superposition principle is applied to deal with the discontinuous displacements around the sliding surface existed in previous methods. The displacement and bending moment results obtained by the proposed method are verified by in-situ pile side loading test. The displacement error of pile top is less than 3%, the maximum bending moment error of pile is less than 10%. The proposed method is helpful for the design and calculation of anti-sliding piles in deep soft soil layer.

Key words: pile foundation engineering, anti-sliding pile, deep soft soil, modified cantilever pile method, loading test