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    Volume 41, Issue 2 (March 2018)

    Monitoring Shear Strain in Shallow Subsurface Using Mini Pipe Strain Meter for Detecting Potential Threat of Slope Failure

    (Received 2 June 2016; accepted 14 August 2017)

    Published Online: 2018

    CODEN: GTJODJ

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    Abstract

    The following study examines a new soil measurement method to achieve simple and reliable slope monitoring to ensure labor safety. The method measures the increase in shear strain in the shallow subsurface of the slope. The target that is measured in the soil using this method is different from that of the conventional methods, which use extensometers and inclinometers. Although the increase in shear strain in the shallow subsurface is considered negligible, this study discusses the potential application of the measurement for detecting the potential threat of slope failure. A mini pipe strain (MPS) meter was developed to measure shear strain in the shallow subsurface of slopes. A full-scale test model of slope failure was constructed via excavation to examine the detectability of the threat of slope failure using an MPS meter. Corresponding to the development of slip surfaces in deep positions, less than 0.5 % of shear strain in the shallow subsurface is clearly observable. Although the inverse of the shear strain rate (1/ν) showed a drastic decrease prior to failure, the slope did not fail immediately; in addition, creep phenomena was observed. An unstable slope may be considered a stable one because of the lag time prior to failure. Identifying the second or third creep could provide a few minutes for workers to escape. Accordingly, the threat of workers being injured by collapsing soil can be reduced by using the proposed method and sensor.

    Author Information:

    Tamate, Satoshi
    Construction Safety Research Group, National Institute of Occupational Safety and Health, Japan, Kiyose, Tokyo

    Hori, Tomohito
    Construction Safety Research Group, National Institute of Occupational Safety and Health, Japan, Kiyose, Tokyo


    Stock #: GTJ20160117

    ISSN:0149-6115

    DOI: 10.1520/GTJ20160117

    Author
    Title Monitoring Shear Strain in Shallow Subsurface Using Mini Pipe Strain Meter for Detecting Potential Threat of Slope Failure
    Symposium ,
    Committee D18