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

Journal article (2022)

Authors

Dongzhu Zheng Universiteit Gent
Adam Bezuijen Universiteit Gent
A.M. Talmon Offshore and Dredging Engineering - Mechanical, Maritime and Materials Engineering
Research Group
Offshore and Dredging Engineering (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2022 Dongzhu Zheng, Adam Bezuijen, A.M. Talmon
DOI: https://doi.org/10.1061/(ASCE)GM.1943-5622.0002439
Rheology Bentonite slurry Correction factor Field use Marsh funnel test
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Published Date

2022

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Marine and Transport Technology

Research Group

Offshore and Dredging Engineering

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.