PVC微型顶管低负荷一次工法在国内应用处于起步阶段，柔性PVC管环刚度较小导致顶进过程中土压力重分布和产生弹性抗力，现有规范已不能准确估算顶进力。介绍了PVC微型顶管一次工法的原理及施工方法，同时基于太沙基土压力理论，考虑PVC管竖向变形对土拱效应的影响以及考虑柔性管道水平变形弹性抗力产生的附加摩阻力，在此基础上推导出相应的顶进力计算公式，并利用ABAQUS有限元软件进行了验证和参数化分析。结果表明：PVC管的管周压力因管道变形而增大，所提出的顶进力计算模型的预测下限与实测值产生的最大误差为15%，实测值位于预测上限和下限之间，证明其具有适用性；参数化分析显示，管道直径每增加100 mm，会使顶力增加1.6倍左右。管道埋深从4.5 m增加到6 m，顶进力增大了3倍左右。

The low-load one-time construction method of PVC micro-pipe jacking was applied in China and is in its infancy. The small stiffness of the flexible PVC pipe ring leads to the redistribution of soil pressure and the generation of elastic resistance during the jacking process. The jacking force can not be accurately calculated by the existing specifications. The principle and construction method of the PVC micro-pipe jacking method were used to investigate. At the same time, the influence of vertical deformation of PVC pipe on soil arching effect and the additional frictional resistance caused by horizontal deformation were considered based on Terzaghi soil pressure. The corresponding jacking force calculation formula was derived on this basis. Furthermore, the factors that influence the jacking force of PVC pipes were analyzed through finite element numerical simulation. The results indicate that the pressure around the PVC pipe will increase due to the deformation of the pipe. The maximum error between the predicted lower limit and the measured value of the jacking force calculation model proposed is 15%. The measured value is between the predicted upper limit and the lower limit, which proves its applicability. The parametric analysis indicates that the jacking force increases by 1.6 times as the pipe diameter increases by 100 mm and the jacking force increases by about 3 times when the buried depth of the pipeline increases from 4.5 m to 6 m.