Abstract:

Owing to the economic advantage, the pipe jacking method has been used widely; the control of surrounding environment has also been promoted. But for the disturbance characteristics it is only researching on the medium and small pipe jacking; and it has no considering the particularity of super large diameter pipe jacking. Based on the in-situ monitoring of the Shanghai Expo Cable Tunnel construction, the curves of soil and water pressure are analyzed. The results show the disturbance characteristics for 5 stages during the propulsion. The engineering experiences show that three key parameters of long distance pipe jacking construction are slurry sleeve, stability control of excavation face and position dynamic adjustment. The slurry sleeve forming process and disturbance characteristics are researched; in the process of slurry injecting, slurry membrane forming and the slurry sleeve completion, the functions of the slurry sleeve are filling, supporting, deadening and lubricating, etc.

Key words: super large diameter pipe jacking, disturbance characteristics, soil and water pressure changing, slurry membrane, slurry sleeve mechanism