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A case study of determination of rock damage threshold and its application in rock blasting

机译：岩石损伤阈值确定及其在爆破中的应用

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摘要

A case study on defining rock damage threshold has been conducted by discrete elementrnmethod. The threshold was then used for determining the sphere of blast influence at a nuclear power plant inrnChina. First, the initiation and propagation of microcracks in rock specimen during uniaxial compression testrnhas been investigated. The whole process, i.e., from crack initiation to specimen failure, was divided into fourrntypical stages. At each stage the mechanical properties and deformation characteristics of rock specimen havernbeen analyzed in detail, through which a damage threshold of Dcri=0.17for the welded tuff at current site wasrnproposed. On the basis of this definition, the critical percentage speed variation of sound waves (PSV)rnthrough rock mass can be given by ηcri=9%. Thus, the sphere of blast influence can be determined andrntherefore, the integrity of preserved bedrock can be appraised. The current study provides a theoretical basisrnfor sound wave test technology. It’s observed that, in a cylindrical charge explosion, the radius of rockrndamage zone is about 3 times of the depth, and the adverse effects of blasts attenuate much more rapidlyrndownwards than horizontally.
机译：用离散元方法进行了定义岩石破坏阈值的案例研究。然后将该阈值用于确定中国核电厂的爆炸影响范围。首先，研究了单轴压缩试验中岩石试样中微裂纹的产生和扩展。从裂纹开始到试样破坏的整个过程分为四个典型阶段。在每个阶段都对岩石试样的力学性能和变形特性进行了详细分析，从而提出了对当前位置的焊接凝灰岩的损伤阈值Dcri = 0.17。根据此定义，可以通过ηcri= 9％给出通过岩体的声波（PSV）的临界速度变化百分比。因此，可以确定爆炸影响的范围，因此可以评估保存的基岩的完整性。本研究为声波测试技术提供了理论基础。据观察，在圆柱形装药爆炸中，岩石损坏区的半径约为深度的3倍，爆炸的不利影响在向下衰减的程度要比在水平方向快得多。

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  • 会议地点 Wuhan(CN)
  • 作者

    Xiang Xia; Haibo Li; Bing Xie;

  • 作者单位

    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy ofSciences, Wuhan 430071, China;

    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy ofSciences, Wuhan 430071, China;

    Department of Civil Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China;

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