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中文摘要：
研究目的：为了顺应线路需要，高原地区修建的大量桥梁桩基工程处于高陡边坡之上。处于边坡上的桥墩桩基础由于边坡土体水平抗力对桩身影响而受力复杂。本文基于非线性有限元软件平台，结合黄土边坡上修建的铁路桥梁算例，建立考虑材料和桩土接触非线性影响的边坡一承台一桩基系统力学分析模型，目的在于从系统承载力、变形和应力等多方面研究边坡一承台一桩基系统在恒载和组合荷载工况下的力学行为。研究结论：通过对桥梁算例的分析，得出：（1）对于边坡上的桩基础桥墩，边坡水平抗力对桩基受力影响较大，桩基位移和应力均呈现出沿坡向的非均匀性；（2）对于多地层边坡，桩基位移和应力在土层分界处存在突变，桩基在分层部位存在受力不利区域；（3）本文研究方法和结论可为边坡上修建的桥梁桩基础的设计和力学分析提供理论借鉴。
英文摘要：
Research purposes： In order to comply with the demands of road, lots of pile foundation of bridge are built on high and steep slope in plateau area. The load on the pile foundation of the pier located on slope is more complex because of the influence of the horizontal resistance of slope soil on the piles. By using the nonlinear finite element program, the slope - pier cap - pile foundation mechanical behavior analysis model is built on consideration of the non - linear influences of the materials and pile - soil touch to study the mechanical behavior of the slope - pile cap - pile foundation system under conditions of dead load and combined loads from the areas of the load bearing capacity,deformation and stresses of the system. Research conclusions： From the analysis of the calculation example, it is concluded： （1） For bridge pier with pile foundation on slope ,the horizontal resistance of the slope has rather big influence on the pile foundation bearing the load and the displacement and stress of the pile foundation are of nonunifonnity along the slope. （2） For multi -layered soil slope, the displacement and stress of the pile foundation sharply change in the parting region of soil layers and the pile foundation has an unfavorable load bearing area in the parting region of soil interlayers. （3） The research method and results presented in this paper can provide the reference to design and mechanical analysis of the pile foundation of bridge on slope.
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