Masakazu HIGASHIKAWA

Numeral Analysis of Site Measurement on Pipe Line Behavior and Stress in Pipes

Mitsutaka SUGIMOTO

Pipe jacking method is a technique for installing underground pipelines. Powerful hydraulic jacks are used to push pipes into the ground behind a TBM, at the same time excavation is taking place ahead of the TBM. The main factor influencing on jack force is the friction resistance between pipes and ground, then the excavation radius by TBM is larger than the outer radius of pipes. The over-cutting area between pipes and the ground is a significant factor giving influence to jack force. So far, most of the models estimating jack force do not consider the over-cutting area, and then the pipe behavior is not still clarified well.
To overcome the above problems, the new analysis model has been developed by using the full ground spring model that can take over-cutting into consideration. This study aims to validate this analysis model by a site measurement.
As a result of the site measurement and the analysis, thrust force transmitted by the cushion material to pipe. It was found that the analysis using developed stack pipe model could simulate the pipe line behavior and the stress in the pipes during construction. Therefore, this model was validated

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