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针对双向增强体加固软土路基的作用特点,分析了筋材—桩—桩间土在路堤荷载作用下荷载传递机理。根据位移和应力连续条件,将路堤填土和加固区作为统一的整体考虑,并将一定厚度水平向加筋垫层视为具有一定刚度的薄板,基于大挠度薄板理论模拟筋材的挠曲变形,同时考虑了路堤土拱效应和路基桩土相互作用,建立了路堤荷载作用下双向增强体复合地基受力模型和桩土应力比的有限差分解法。采用相关文献中的工程试验结果对本文的计算方法进行了验证,与其他计算结果进行比较分析,并综合分析了筋材抗拉模量、桩土差异沉降、桩净间距和路堤填土高度对桩土应力比的影响。结果表明采用本文方法计算出的桩土应力比更接近实测结果,说明该计算方法是合理的,可为工程实践提供理论参考。
In view of the characteristics of the reinforcement of soft soil subgrade with bidirectional reinforcements, the load transfer mechanism of the reinforcement-soil-pile-soil under embankment load is analyzed. According to the continuous displacement and stress conditions, the embankment fill and reinforcement zone are considered as a unified whole, and the stiffened cushion layer is treated as a certain stiffness level at a certain thickness level. Based on the theory of large deflection plate, the flexural deformation The soil arching effect of the embankment and the pile-soil interaction between the embankment and the embankment are taken into account, and the finite difference solution method of the stress model and the pile-soil stress ratio of the two-way reinforced composite foundation under the embankment load is established. The calculation results of this paper are validated by engineering test results in relevant literatures and compared with other calculation results. The tensile modulus of reinforcement, settlement differential settlement of pile and soil, net spacing of pile and height of embankment filling are comprehensively analyzed Effect of pile - soil stress ratio. The results show that the pile-soil stress ratio calculated by this method is closer to the measured results, which shows that the calculation method is reasonable and can provide theoretical reference for engineering practice.