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Gold Science and Technology >

2019 , Vol. 27 >Issue 4: 565 - 572

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.04.565

Mining Technology and Mine Management

Study on Blasting Parameters of Pre-reserved Smooth Blasting Layer Under In-situ Stress and Double Damage

  • Weihua WANG , 1 ,
  • Tengfei SUN , 1 ,
  • Xitao LIU 2
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  • 1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • 2. Jiaojia Gold Mine，Shandong Gold Mining (Laizhou) Co. ，Ltd. , Laizhou 261400，Shandong，China

Received date: 2018-11-07

  Revised date: 2019-03-22

  Online published: 2019-08-19

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Highlights

For underground mining，the reserved blasting layer for secondary blasting can ensure the contouring effect of the roadway face and reduce the surrounding rock damage.When using the reserved photo-explosive layer for roadway blasting，the influence of the initial stress field redistribution on the blasting crack propagation，the damage of the inner ring blasting to the reserved photo-explosive layer，and the stress wave during the blasting of the photo-explosive layer should be considered.Based on the interaction theory of ground stress，stress wave and explosive gas，the parameters of the secondary blasting of the reserved photo-explosive layer are optimized.The influence of the thickness of the reserved photo-explosive layer on the redistribution of ground stress and the influence of the secondary stress on the crack propagation of the explosion are analyzed.It is known that the secondary stress will inhibit the crack propagation and the thickness of the photo-explosive layer and the secondary stress are positive correlation，therefore，in the construction of the project，the thickness of the photoburst layer should be reserved for the secondary blasting.The thickness of the blast layer should not be too large.The analysis should not consider the damage，consider one damage and consider the double damage conditions，the axial non-coupling coefficient and the blasthole.The change in the size of the gap makes it possible to appropriately increase the axial uncoupling coefficient and the blast hole spacing in consideration of the damage.Taking the deep mining project of Jiaojia gold mine as the background，compared with the blasting effect before and after the optimization of blasting parameters，it can be seen that considering the ground stress and damage in deep mining，the porosity and cost can be improved.The research results provide a theoretical basis for the standardization of underground mining blasting，which can provide reference for similar projects.

Cite this article

Weihua WANG , Tengfei SUN , Xitao LIU . Study on Blasting Parameters of Pre-reserved Smooth Blasting Layer Under In-situ Stress and Double Damage[J]. Gold Science and Technology, 2019 , 27(4) : 565 -572 . DOI: 10.11872/j.issn.1005-2518.2019.04.565

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