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    Volume 48, Issue 5 (September 2020)

    Development and Application of a Multifunction True Triaxial Rock Drilling Test System

    (Received 12 December 2017; accepted 11 July 2018)

    Published Online: 2020

    CODEN: JTEVAB

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    Abstract

    The real-time acquisition of the rock mass mechanical parameters and the rapid classification of the surrounding rock during the construction of an underground structure are of great value for informational construction and optimization of the parameters of the supporting structure. However, it is currently difficult to rapidly acquire rock mass mechanical parameters at construction sites. The “digital drilling rig”–based drilling test technique is an effective approach for addressing this problem. Therefore, this study develops a multifunction true triaxial rock-drilling test system (TRD system). This system can be employed to test various types of rock or fractured rock masses to determine the correlations between the drilling parameters and the rock mechanical parameters under three-dimensional confining pressure conditions. This article introduces the basic features and the composition of each component of the TRD system. Drilling tests on different types of rock specimens under various control parameter conditions are performed, and the drilling tests on sandstone specimens under different confining pressures were carried out. The test results demonstrate significant correlations between the drilling parameters and between the drilling parameters and the rock mechanical parameters during the drilling process. The drilling parameters are responsive to confining pressure. The conclusions of the correlation analysis and the stable monitoring data obtained under various test parameter conditions verify the reasonableness and effectiveness of the TRD system’s structure. This study lays the foundation for further investigations of the quantitative relationships between the drilling parameters and the rock mechanical parameters and develops a key technology that uses the drilling parameters of a “digital drilling rig” to characterize the mechanical parameters of the surrounding rock at underground construction sites.

    Author Information:

    Wang, Qi
    Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan,

    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou,

    Gao, Hongke
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou,

    Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan,

    Jiang, Bei
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou,

    Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan,

    School of Civil Engineering and Architecture, University of Jinan, Jinan,

    Li, Shucai
    Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan,

    Gao, Song
    Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan,

    He, Manchao
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou,

    Zhang, Chong
    Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan,


    Stock #: JTE20170740

    ISSN:0090-3973

    DOI: 10.1520/JTE20170740

    Author
    Title Development and Application of a Multifunction True Triaxial Rock Drilling Test System
    Symposium ,
    Committee D18