Criteria for face support of microtunnelling TBMs

Wout Broere*

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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 guidelines for a proper selection of bentonite suspensions based on soil gradation.

Original languageEnglish
Title of host publication2013 International No-Dig Downunder
PublisherInternational Society for Trenchless Technology
ISBN (Print)978-0-9871616-6-6
Publication statusPublished - 1 Jan 2013
Event31st ISTT International No-Dig Downunder - Sydney, Australia
Duration: 1 Sep 20134 Sep 2013

Conference

Conference31st ISTT International No-Dig Downunder
CountryAustralia
CitySydney
Period1/09/134/09/13

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