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为了系统分析桩网支撑路堤结构的荷载传递效应,首先基于单元分析模型和Marston埋管理论,考虑到路基荷载应力重分布时竖向应力水平和界面剪切强度发挥的影响,采用分段平衡控制方程结合边界位移协调的方法,建立了路基荷载传递分析的分段解析模型;在此基础上,考虑垫层加筋的张拉膜效应影响,结合复合地基桩土相互作用的简化分段分析,根据应力、位移连续性条件,建立路基–加筋(网)垫层–刚性桩复合地基联合作用的桩网支撑路堤结构荷载效应整体计算模型并给出求解方法,明确了桩、土间的荷载分担。通过与工程实测结果的对比,验证了该计算模型的可靠性,并算例分析了路基模型界面剪切强度发挥、筋材兜提效应和垫层材料性能等因素的影响规律,可为桩网支撑路堤结构荷载传递机制的研究提供参考。
In order to systematically analyze the load transfer effect of pile-supported embankment, based on the element analysis model and Marston buried pipe theory, considering the influence of vertical stress level and interfacial shear strength under subgrade load stress redistribution, Based on the equation and the method of boundary displacement coordination, a sub-analytical model of subgrade load transfer analysis was established. On the basis of this, considering the effect of the tensioned membrane effect of reinforced cushion, combined with simplified subsection analysis of pile-soil interaction in composite foundation, According to the stress and displacement continuity conditions, the whole calculation model of the load-bearing effect of the pile-supported embankment with subgrade-reinforced (net) cushion-rigid pile composite foundation is established and the solution method is given. Share. The reliability of the calculation model is verified by comparison with the measured results of the project. The influence laws of exertion of the shear strength at the interface of the embankment model, the effect of the reinforcement material and the properties of the cushion material are analyzed by examples. The study of load transfer mechanism supporting embankment structure provides reference.