结合武汉竹叶海立交的拓宽工程，分析了新旧桥梁的相关沉降理论，并根据荷载传递法及剪切位移法，建立了 voigt 土体模型的桩基微单元静力平衡微分方程，求解了桩顶位移响应函数，得出在规定荷载、规定时间下的沉降预测解析解，绘制了荷载—位移—沉降的三维关系图，直观展示出了变量间的相互关系。%This paper has discussed the settlement theory of widening project between an old and new bridge,combined with the Wuhan Zhuyehai Interchange. According to the load transfer method and the shear displacement method,the static equilibrium differential equations of the pile foundation based on the voigt model were established,the displacement response function of the pile top had been solved,and the analytical solu-tion of settlement prediction was established under prescribed load and time. Load-displacement-settlement relationship,and the relationship be-tween the variables was displayed intuitively.
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