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    Volume 48, Issue 5 (September 2020)

    Experimental and Theoretical Analysis of Stress Superposition in Double-Hole Blasts

    (Received 6 February 2018; accepted 11 July 2018)

    Published Online: 2020

    CODEN: JTEVAB

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    Abstract

    Using an experimental system of digital image correlation based on a high-speed camera which can be applied for blast-induced loading, model experiments of single-hole and double-hole blasts were conducted in polycarbonate specimens, and the evolutionary processes of the full-field strain were studied during blast loading. The results showed that the strain peak at the midpoint between two blastholes in double-hole blasts was 2.4–2.7 times as large as that in single-hole blasts. The stress superposition effect of double-hole blasts was much larger than 2, which is predicted by elastic wave theory. In addition, the superposition of double-hole blast stresses was analyzed by elastic and shock wave theories. These results indicated that when examining the superposition of blast stress waves, the shock wave theory is more in line with the experimental results. Based on the experimental results, there were discussions of the definition of the elastic vibration zone in the traditional blast theory.

    Author Information:

    Yang, Liyun
    School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing,

    Ding, Chenxi
    School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing,

    Yang, Renshu
    School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing,

    State Key Laboratory for Geomechanics and Deep Underground Engineering (Beijing), Haidian District, Beijing,

    Wang, Qingcheng
    School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Haidian District, Beijing,


    Stock #: JTE20180093

    ISSN:0090-3973

    DOI: 10.1520/JTE20180093

    Author
    Title Experimental and Theoretical Analysis of Stress Superposition in Double-Hole Blasts
    Symposium ,
    Committee D18