中文摘要：

考虑轨道梁与地基、软弱夹层与相邻土层间的界面作用,建立轨道梁与地基作用体系的有限元模型,分析轨道梁荷载作用下含软弱夹层地基承载能力。依据本文计算结果给出了相应设计方案。通过与试验结果的比较分析,证实了计算模型和计算结果的合理性。研究结果表明：规范方法计算结果偏保守,本文的分析方法更能反映结构与地基作用特性,计算结果与试验结果接近,给出更为合理的承载能力评价;对于含软弱夹层地基,基础垫层厚度和软弱夹层厚度对地基承载力计算结果影响较大;随着轨道梁刚度变化,地基承载能力和变形特性不同,而柔性轨道梁对地基适应性更好,结构受力也更合理。

英文摘要：

The bearing capacity analysis was carried out by finite element method using a viscoplastic algorithm and the Tresca yield criterion.The six-noded triangle was used to modeling foundation soil,and beam element was incorporated to model beam foundation.A four-noded quadrilateral element was adopted in order to model the interface between beam and foundation soil.The design was put forword by the calculations.Compared with standardized methods and static load test results,the proposed method is more reasonable to evaluate the bearing capacity of beam foundation on underlying weak laminated arch clay,while the standardized method was relative conservative.The influences of beam stiffness on the bearing capacity were also analyzed,calculation shows beams with lower stiffness are more applicable to weak layer relatively.