考虑边坡效应的铁路桥台桩基力学行为分析

发布时间：2018-10-23 20:58

【摘要】：以位于黄土高边坡上的某铁路桥梁为例,采用有限元软件ANSYS,建立考虑材料和桩土接触非线性影响的边坡—桥台—桩基系统力学分析模型,研究边坡—桥台—桩基系统在地震时无车和有车通过工况下的力学行为。研究结果表明,对处于高陡边坡上的桩基础桥台,边坡水平抗力对桩基的受力影响较大,受水平地震和边坡推力的综合作用,桩基靠边坡一侧越近,其竖向位移和正应力越大。工程算例计算结果表明,边坡外侧桩基的位移和应力可达内侧桩基相应部位位移和应力的6倍多;对于多层的土质边坡,桩基的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,设计中应考虑该部位受力的特殊性。
[Abstract]:Taking a railway bridge on a loess high slope as an example, a mechanical analysis model of slope abutment pile foundation system considering the nonlinear influence of material and pile-soil contact is established by using finite element software ANSYS,. The mechanical behavior of the slope-abutment-pile system under the condition of no vehicle and vehicle passing through the earthquake is studied. The results show that for the abutment of pile foundation on the high and steep slope, the horizontal resistance of the slope has a great influence on the stress of the pile foundation. By the comprehensive action of horizontal earthquake and slope thrust, the closer the pile foundation is to one side of the slope, the greater the vertical displacement and normal stress of the pile foundation are. The calculation results of engineering examples show that the displacement and stress of the lateral pile foundation of the slope can be more than 6 times of the corresponding displacement and stress of the inside pile foundation, and for the multi-layer soil slope, the displacement and stress of the pile foundation have a sudden change at the boundary of the soil layer. There is an unfavorable force area in the layered part of the pile foundation, and the particularity of the bearing force should be considered in the design of the pile foundation.
【作者单位】：兰州交通大学甘肃省道路桥梁与地下工程重点实验室;兰州交通大学土木工程学院;
【基金】：铁道部科技研究开发计划项目(2012G013-H) 长江学者与创新团队计划项目(IRT1139) 甘肃省杰出青年基金资助项目(1210RJDA009) 中国博士后科学基金资助项目(2012M521815)
【分类号】：U443.15

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