Buried pipe crossing faults is an important part of underground city lifeline, which is influenced by many factors. It is necessary to calculate Soil-Pipe-Fluid interaction that includes fluid-structure interaction (FSI) and pipe-soil interaction. Under multi-action of site, fault movement, and earthquake, finite element model of buried liquid-conveying pipe is established by ADINA. Two-way fluid-structure coupling methods for fluid-structure interaction and definition of contact for pipe-soil interaction are introduced. Pipe-soil friction is defined in solid model; especially, flow assumption and fluid structure interface condition are defined in fluid model. Damage of buried liquid-conveying pipe under soil-pipe-fluid action is calculated under fluid-structure coupling with pipe-soil interaction. Influences of site soil and liquid velocity on effective stress and circumferential strain of buried liquid-conveying pipe are analyzed, and some advice is proposed for pipe protection.
