Abstract-Uneven settlement will cause the buried pipeline deformed, even crack. A 3-D finite element model for buried pipeline was established by ADINA to investigate the deformation of pipe under uneven settlement. Furthermore, the effects of some key factors on mechanical response of buried pipeline were analyzed. Results indicate that the maximum axial stress increases with the decreases of diameter and wall thickness, the increases of the soil stiffness and buried depth.

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In order to analyze the effect of pipe-soil friction on crack propagation of buried liquidconveying pipeline, computing methods of friction coefficient between site soil and pipe and iterative solution method of two-way couplings on internal interface of pipe for liquid-structure interaction were introduced. A three dimensional finite element model with parasolid and native method was established, in which friction and fluid-structure boundary for interaction iterative solution was considered. Then, crack of buried liquid-conveying pipeline and effect of pipe-soil friction were analyzed. Results show the optimal friction coefficient, the damage position, and its stress. Also, some advice is proposed for engineering protection.