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    Volume 39, Issue 5 (September 2016)

    A New Three-Dimensional Pressure Transducer for Measuring Soft Rock Stress

    (Received 13 April 2014; accepted 1 April 2016)

    Published Online: 09 September 2016

    CODEN: GTJODJ

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    Abstract

    Commonly used methods of measuring rock stress, including hydraulic and borehole relief methods, are difficult to apply in deep soft rock masses. This study proposes a new method to measure stress in soft rock by taking advantage of the strong rheological behavior of soft rock masses. Rock stresses can be gradually measured over time by embedding pressure transducers into soft rock masses; this can be accomplished with a newly developed vibrating-wire pressure transducer that can monitor three orthogonal normal stresses. Based on the elastic theory, this study derives the relationship between applied pressures and frequency changes of the vibrating wire. Uniaxial and triaxial calibration tests were performed using a rock mechanical testing system to investigate the repeatability, linearity, and interference characteristics of the new transducer. The performance of the transducer was also verified in a model test using a true triaxial loading system, in which the transducer was tested under different stress states in a cement mortar body. The results indicate the transducer performs well and is applicable for soft rock stress measurement.


    Author Information:

    Zhu, Y.
    State Key Laboratory of Geomechanics and Geotechnical Engineering, Inst. of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan City, Hubei Province

    Liu, Q.
    State Key Laboratory of Geomechanics and Geotechnical Engineering, Inst. of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan City, Hubei Province

    School of Civil Engineering, Wuhan University, Wuhan,


    Stock #: GTJ20140077

    ISSN:0149-6115

    DOI: 10.1520/GTJ20140077

    Author
    Title A New Three-Dimensional Pressure Transducer for Measuring Soft Rock Stress
    Symposium ,
    Committee D18