软土地区盾构开挖势必会造成上覆土体的沉降，进而会引起上覆既有管道-土体相互作用。因此，通过理论方法快速准确地评估隧道开挖引起上覆管道沉降变形的影响对实际工程至关重要。基于此种工况，首先采用Loganathan公式获得既有管道在盾构下穿影响下的附加应力，随后采用双参数的Vlazov地基模型并结合管道两侧侧向土体影响，建立隧道下穿作用下上覆管道系统的能量方程，进一步基于能量变分理论对管道总能量进行变分求解，最后获得管-土相互作用解析解。与既有离心机实测数据比较，验证了该方法的合理性；与该方法退化的Vlazov和Winkler地基解析对比，该方法更接近实测数据。进一步参数研究表明：增大地层损失率会导致管道变形及其弯矩的线性增大；但增大隧道和管道的竖向净距会造成管道变形响应的减小；而隧道与管道的夹角的增大会减轻管道变形，但会增大管道弯矩。

Shield tunneling is bound to cause the settlement of overlying soil in soft soil area, which will lead to the overlying existing pipeline-soil interaction. Therefore, it is very important for practical engineering to quickly and accurately evaluate the influence of tunnel excavation on the settlement deformation of overlying pipeline by theoretical method. Based on this engineering condition, the additional stress of the existing pipeline under the influence of shield tunneling was obtained by Loganathan formula firstly. Then, the energy equation of the overlying pipeline system under the influence of shield tunneling was established by using the two-parameter Vlazov foundation model and combing the influence of lateral soil on both sides of the pipeline. Then, the total energy of the pipeline was solved by energy variational theory, and the analytical solution of pipeline-soil interaction was obtained. Compared with the measured data of the existing centrifuge, the rationality of the method was verified. Compared with the analytical results of Vlazov and Winkler foundation degraded by this method, this method was closer to the measured data. Further parameter studies show that increasing the volume loss rate will lead to a linear increase in pipeline deformation and bending moment. However, increasing the vertical distance between the tunnel and the pipeline will reduce the deformation response of the pipeline. The increase of the angle between the tunnel and the pipeline will reduce the deformation of the pipeline, but will increase the bending moment of the pipeline.