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Volume 36 Issue 4
Jul 2022
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Chinese Journal of High Pressure Physics  > 2022  >  36(4): 045301.
ZHAO Xiaoming, YANG Yumin, JIANG Nan, CAI Zhongwei, OUYANG Song. Optimization of Charging Structure of Surrounding Holes in Smooth Blasting of Deep Diversion Tunnel[J]. Chinese Journal of High Pressure Physics, 2022, 36(4): 045301. doi: 10.11858/gywlxb.20220503
Citation: ZHAO Xiaoming, YANG Yumin, JIANG Nan, CAI Zhongwei, OUYANG Song. Optimization of Charging Structure of Surrounding Holes in Smooth Blasting of Deep Diversion Tunnel[J]. Chinese Journal of High Pressure Physics, 2022, 36(4): 045301. doi: 10.11858/gywlxb.20220503
shu

Optimization of Charging Structure of Surrounding Holes in Smooth Blasting of Deep Diversion Tunnel

doi: 10.11858/gywlxb.20220503
  • 1.

    China International Water & Electric Corporation, Beijing 100011, China

  • 2.

    Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China

  • Received Date: 17 Jan 2022
  • Rev Recd Date: 23 Feb 2022
    • Available Online: 16 May 2022
  • Issue Publish Date: 28 Jul 2022
    Abstract
  • The distance between explosive roll of surrounding hole is one of the important factors affecting the effect of smooth blasting. Based on the diversion system project of hydropower station in Peru, this paper introduced the blasting design scheme of the project and evaluated the blasting effect. The peripheral hole model under different charge structures was established by ANSYS/LS-DYNA to analyze the blasting effect of the surrounding hole model on rock. At last, the optimal design scheme of surrounding hole is selected for blasting test, so as to improve the over excavation and under-excavation phenomenon of the project. The results show that when the distance is less than 350 mm, the under-excavation will not appear and the over excavation range decreases with the increase of the distance between the surrounding holes. When the distance is more than 400 mm, the under-excavation begins to appear in the blasting effect and increases with the increase of the distance. Through the comparative analysis of the numerical model, it is concluded that the optimal charge spacing of the surrounding hole is 350 mm. The optimal design scheme is adopted for the blasting test. It is obtained that the overbreak range is significantly reduced, and the maximum distance is reduced from 43 cm to 30 cm.

     

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