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    Volume 50, Issue 1 (June 2021)

    Impact of Beater Shape in Mixing Test to Determine Clogging Potential

    (Received 25 September 2020; accepted 13 April 2021)

    Published Online: 16 June 2021

    CODEN: JTEVAB

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    Abstract

    Clogging is a common phenomenon in tunnel boring machine (TBM) excavations, and cutterhead shape can influence clogging potential. In this research, a mixing test with a newly proposed index has been introduced to assess clogging potential. Five mixtures—composed of different percentages of bentonite and kaolin—were employed to simulate soil conditions. For each mixture, samples with five different water contents (ranging between the plastic and liquid limits) were employed in the mixing test. Three different beater shapes were used to investigate the effect of beater shape on mixing test results. The ratio (A′/A) between the open area of the beater (A′) and the entire surface area of the beater with no opening (A) was introduced to quantify the difference in beater shape. The Hobart mixer used in the research is 18.9 liter (20-qt). Two indexes were used to analyze mixing test results: the weight of soil stuck to the beater per unit area (W/Ac) and the weight of soil stuck to the beater (GB). The results indicate that both W/Ac and GB increase with increasing bentonite content in the mixture. However, there are no clear trends that can be observed in GB for different beater shapes. The variation of maximum GB is within 0.5 kg when A′/A increases from 0.52 to 0.7 for the 5 clay mixtures, showing a difference of 12 %. It is concluded that W/Ac increases dramatically with an increase in the open area of the beater, whereas GB only varies slightly. Undoubtedly, the shape of beater used cannot be ignored for tests to assess clogging potential. Furthermore, W/Ac is a good indicator to detect the impacts of beater shape on mixing test results.

    Author Information:

    Zhou, Yang
    Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB

    Kang, Chao
    School of Engineering, University of Northern British Columbia, Prince George, BC

    Bayat, Alireza
    Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB


    Stock #: JTE20200599

    ISSN:0090-3973

    DOI: 10.1520/JTE20200599

    Author
    Title Impact of Beater Shape in Mixing Test to Determine Clogging Potential
    Symposium ,
    Committee D18