Correction Factor on Dynamic Force in a Marsh Funnel Test for Tunneling

Abstract This paper presents an improvement on a previous model for predicting the Marsh funnel (MF) test that is used in slurry shield tunneling for evaluating the rheological properties of bentonite slurries. The improvement focuses on the prediction of the dynamic part for fluids with small MF ti...

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Bibliographic Details
Published in:International journal of geomechanics 2022-09, Vol.22 (9)
Main Authors: Zheng, Dongzhu, Bezuijen, Adam, Talmon, Arno
Format: Article
Language:English
Subjects:
Bentonite
Dynamic pressure
Fluids
Laminar flow
Marshes
Pipe flow
Pipelines
Rheological properties
Slurries
Submarine pipelines
Technical Papers
Tunneling
Tunneling shields
Velocity
Velocity distribution
Velocity profiles
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Summary:Abstract This paper presents an improvement on a previous model for predicting the Marsh funnel (MF) test that is used in slurry shield tunneling for evaluating the rheological properties of bentonite slurries. The improvement focuses on the prediction of the dynamic part for fluids with small MF times. The velocity profile of the Herschel–Bulkley fluid in a laminar pipe flow condition is first investigated and a correction factor is introduced in the improved model. Comparisons of results from experiments and calculations with the previous model confirm the improved performance over the existing model. The rheological parameters obtained from the improved model show good resemblance to those obtained from a laboratory viscometer. The work also provides a reference to similar applications such as fluid transportation through pipelines where dynamic pressure dominates and therefore should be correctly predicted considering its velocity profile in a laminar condition.
ISSN:1532-3641
1943-5622
DOI:10.1061/(ASCE)GM.1943-5622.0002439