Volume 43 Issue 3
Mar.  2023
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ZUO Jinjing, YANG Renshu, GONG Min, XIE Quanmin, ZHAO Yong, YOU Yuanyuan. On the distribution of explosion strain field and fracture field in segment charge[J]. Explosion And Shock Waves, 2023, 43(3): 035101. doi: 10.11883/bzycj-2022-0333
Citation: ZUO Jinjing, YANG Renshu, GONG Min, XIE Quanmin, ZHAO Yong, YOU Yuanyuan. On the distribution of explosion strain field and fracture field in segment charge[J]. Explosion And Shock Waves, 2023, 43(3): 035101. doi: 10.11883/bzycj-2022-0333

On the distribution of explosion strain field and fracture field in segment charge

doi: 10.11883/bzycj-2022-0333
  • Received Date: 2022-08-07
  • Rev Recd Date: 2022-10-02
  • Available Online: 2022-10-13
  • Publish Date: 2023-03-05
  • In order to explore the distribution of the explosion strain field and fracture field of segmented charge explosion, used digital image correlation analysis (DIC) and computerized tomography (CT) scanning experiment analyzed the distribution of the explosion strain field and fracture field of the segment charge, established three-dimensional reconstruction model of “rock-explosion crack”, described the spatial distribution of the location and shape of the explosion crack, and obtained the fractal dimension and damage degree of the explosion crack. The research results show that: the segment charge changes the full-field strain morphology of the medium caused by continuous charge. Under the condition of satisfying the damage effect of upper sublevel explosive on medium, the effect of lower sublevel explosive on medium is increased, at the same time, the time of blast stress wave is prolonged. It can be seen from the three-dimensional cracks of segmented charge and continuous charge explosion, the explosion crack mainly expands along the radial direction, the annular crack formed by axial stress and strain is not obvious, and the radial direction is the main direction of rock failure. When the charge ratio of the upper segment is 0.4, the strain peak value of the lower segment is larger, which better meets the demand of the rock mass for explosion energy in the lower segment in engineering practice. Under the same charging coefficient, the explosive cracks in the continuous charging structure do not run through the whole specimen, and the explosive cracks in the plugging section are less, under the segment charge structure, the upper sublevel of rock mass can better use the energy of explosive explosion to break rock because the position of explosive is improve. The overall damage degree of rock in segment charge is 23.5% higher than that in continuous charge, and the damage degree of rock in upper sublevel is 46.4% higher than that in continuous charge.
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