Analysis on Bearing Behavior of Single Pile under Combined Action of Vertical Load and Torque in Expansive Soil

To reasonably analyze the bearing characteristics of curved beam bridge pile foundation under combined action vertical force (V) and torque (T) in expansive soil, a method determining Tu (limit torque) V is proposed. Considering effects ground heave after immersion, load transfer function at pile–soil interface with positive negative friction resistance established. The nonlinear solution single achieved by finite difference method. Subsequently, circumferential limit modified, loop iteration program compiled through MATLAB. Thus, capacity loading path V→T obtained. corresponding failure envelope curve drawn verified laboratory model tests. Based on solution, deformation are analyzed. influence expansion rate discussed, reasonable engineering suggestions put forward.