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  Wear prediction and maintenance frequencies of slurry pipes for TBM tunnelling

  In this study, the average wear rates of slurry discharge pipes were determined from the thickness of slurry discharge pipe, which was periodically measured at the TBM site in Singapore. The wear rate of slurry pipes for Bukit Timah Granite was obtained. The wear rate of pipes was found to have higher values near the TBM. The wear rates for G(V) grade and mixed zone were 1.5 times higher than that of G(I) to G(IV) grade. Slurry pipe wear rate tended to increase in proportion to the slurry discharge velocity. The optimal slurry pipe replacement or rotation frequency can be estimated through the selection of the pipe wear rate considering geological condition and the reasonable remaining thickness of pipes.

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