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Settlement site has a great influence on pipelines, which sometimes leads to pipelines damage and unable to work properly. In order to evaluate the safety of buried pipelines, taking the long distance pipeline crossing settlement site as an object, the overall numerical model including site and pipeline was established by using finite element software-ADINA. Influences on axial strain of pipeline were investigated, such as diameter, wall thickness, buried depth, pipe material, soil cohesive force, and pipe internal pressure. Then, key factors were identified according to the influence weight of these parameters on mechanical properties of pipeline. Introduction When uneven settlement of site occurs, buried pipeline will be bent and deformed axially due to endure external force produced by soil deformation and movement. Severe soil deformation may cause pipeline buckling or fracture, and result in great losses. So, safety evaluation on city buried pipeline under site settlement is a key scientific problem of reducing accident harm, preventing accident extending, and keeping in effective repair. Newmark[1] proposed calculation theory of pipeline damage firstly which became the theoretical basis for seismic design of buried pipeline. According to foundation beam model of Winkler, Limura S. [2] used the actual value of site settlement to inverse a formula for calculating stress and strain of buried pipeline. Considering the effect of pipe soil interaction on bending deformation of buried pipeline, Dhar A. S. and et al. [3] proposed a simplified formula by adopting continuum theory and finite element analysis. References [4, 5] constructed partial differential equations for strain deformation of long-distance buried pipeline under mining settlement, then based on boundary condition of pipeline, deflection and rotation angle under external load were solved. Gong X.N. and et al. [6] researched the displacement of buried pipeline under the action of overloading and external force, and analyzed the influences of pipeline diameter, buried depth and loading on deflection. References [7, 8] established mechanical response model of buried gas pipeline under fault site which compared to analytical model of seismic code. References [9, 10] analyzed mechanical response of buried pipeline under site settlement caused by mining. So, based on finite element analysis, multi-groups pipeline numerical models are established, and the effects of diameter, wall thickness and buried depth on axial strain are analyzed. Then weighting estimation to these factors, the functional relationship between these factors and the axial strain of the pipeline is determined by nonlinear curve fitting. Establishment of Numerical Model The interaction model of buried pipeline and soil settlement is established by parasoild mode of ADINA which can analyze influences of the length of settlement zone, buried depth, diameter, and internal pressure on pipeline damage. The model is divided into 3 parts as shown in figure 1 which the middle part is a settlement area and the two sides are non settlement areas.

Analysis on Influence Factors of Buried Fluid-Conveying Steel Pipeline Under Site Settlement