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  Clogging and disintegration of fines during mechanized tunneling in clayey soils

  Shield tunnelling in fine-grained soils is frequently obstructed by clogging. The clogging risk of soils depends on multiple mineralogical and soil-mechanical parameters. The existing approach of estimating the clogging potential, which is derived from the indices of plasticity and consistency, has proven to be beneficial for practical purposes. Furthermore, the dissolving of fines from a cohesive soil within free water, such as slurry, has also shown to have a major negative impact on shield tunnelling. Both risks depend on the properties of the soils as well as the hydrogeological and operational conditions. Soils can have or be transformed to critical consistencies depending on whether or not and to which extent water is available (ground water or support slurry). A new diagram allows for the quantification of changes in the water content and thus, estimating changes in the consistency of fine-grained soils under different boundary conditions (availability of water).

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