Pipe roof-culvert box method is an effective way for shallow buried tunnel passing beneath important facilities. In soft ground, the culvert can be jacked under the pre-reinforcement of pipe roof. This paper presents an investigation on the precision analysis and control of a large- scale pipe roof jacking (the scale of this structure is 21.648m*8.148m) of an underpass, which passes beneath the Mid-Ring expressway in Shanghai. The conclusions drawn from this paper show that: (1) In this project, more than 70 percent of the deflection values of jacking machines and pipes are controlled within 20mm. (2) During the process of pipe jacking, the deflections of pipes tend to lag behind the machines’ about 3~10m. 68 percent of the rangeability of pipes’ deflection are 50%~100% of the corresponding machines’ deflection. (3) Due to Stiffness effect of pipeline, posture of pipe is difficulty to be rectified during the stages of pipe starting and receiving. A compelling rectification will result in overlarge deviation and increase the difficulty of subsequent operation. (4) For two adjacent pipes, the posture of latter pipe is positively related by the stiffness of prior pipe. The Pearson correlation coefficient of horizontal pipes and vertical pipes can be 0.46 and 0.68 respectively. (5) Considering the interspace between top pipes and box culvert, the control criterion of vertical deviation of box culvert is recommended as 5cm.

管顶涵箱法是浅埋隧道通过重要设施下方的有效方法。在软土地基下，可在管顶预加固下顶进涵洞。本文研究了上海中环高速公路地下通道大型顶管顶管（该结构规模为21.648m*8.148m）的精度分析与控制研究。本文得出的结论表明：（1）本工程中，顶管机和管道的挠度值控制在20mm以内，超过70%。(2)顶管过程中，管道的挠度往往滞后于机器3~10m左右。管道挠度的68%为相应机器挠度的50%~100%。(3)由于管道的刚度效应，管道在起管和收管阶段很难矫正管子的姿态。强制整改会导致偏差过大，增加后续操作的难度。(4) 对于相邻的两根管子，后一根管子的姿态与前一根管子的刚度呈正相关。水平管道和垂直管道的 Pearson 相关系数可以分别为 0.46 和 0.68。(5)考虑到顶管与箱涵之间的间隙，建议箱涵垂向偏差控制准则为5cm。(4) 对于相邻的两根管子，后一根管子的姿态与前一根管子的刚度呈正相关。水平管道和垂直管道的 Pearson 相关系数可以分别为 0.46 和 0.68。(5)考虑到顶管与箱涵之间的间隙，建议箱涵垂向偏差控制准则为5cm。(4) 对于相邻的两根管子，后一根管子的姿态与前一根管子的刚度呈正相关。水平管道和垂直管道的 Pearson 相关系数可以分别为 0.46 和 0.68。(5)考虑到顶管与箱涵之间的间隙，建议箱涵垂向偏差控制准则为5cm。