On the face support of microtunnelling TBMs

Journal article (2014)

Authors

Department
Geoscience & Engineering (CEG) (TU Delft)
Copyright: This is an open access article under the CC BY license
DOI: https://doi.org/doi:10.1016/j.tust.2014.09.015
Soft soil Infiltration Microtunnelling Face support Bentonite suspension
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Published Date

19-11-2014

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Source:

Tunnelling and Underground Space Technology, 46, 2015

ISSN:

0886-7798

Faculty

Civil Engineering and Geosciences

Department

Geoscience & Engineering

Abstract

Face stability of microtunnelling TBMs is an important aspect for a safe and controlled project execution. Lack of proper face support can lead to sudden collapse with resulting large settlements. Guidelines for minimal and maximal support pressures in most codes do not take the infiltration of bentonite suspension in coarser soils into account. Infiltration lowers the effectiveness of the face support. In loose sands infiltration can lead to excess pore pressures and induce liquefaction, with possible catastrophic consequences. This paper investigates the influence of infiltration and gives some guidelines for a proper selection of bentonite suspensions based on soil gradation.

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