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针对疏桩路基结构的作用特点,分析了路堤荷载下基底桩、土荷载效应。基于Marston埋管理论,建立了一种疏桩桩帽荷载作用于上部路基(垫层)的应力重分布解析模型,考虑了路基应力重分布时竖向荷载应力水平和剪切强度发挥的影响,结合路基-垫层双层体系工程性状特点,建立了一种适用于路基多层体系的基底荷载分担分段平衡解析法,进一步揭示了路基荷载转移机制。通过工程实例现场实测结果对本文计算方法进行了验证,并与其它计算方法结果进行比较分析,结果表明采用本文方法计算的桩土应力比接近实测结果。
Aimed at the characteristics of the structure of sparse pile embankment, the effect of foundation pile and soil under embankment load is analyzed. Based on Marston embedding theory, an analytical model of stress redistribution for pile foundation subjected to pile loading is established. Considering the effect of vertical load stress level and shear strength on subgrade stress redistribution, Combined with engineering characteristics of subgrade-cushioned double-layer system, a sub-equilibrium load-sharing analysis method for subgrade multi-layer system is established, which further reveals the subgrade load transfer mechanism. Through field test results of engineering example, the calculation method in this paper is validated and compared with other calculation methods. The results show that the pile-soil stress ratio calculated by this method is close to the measured results.