JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (2): 26-31.doi: 10.6040/j.issn.1672-3961.0.2017.098

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Energy dissipating rate analysis of N-J hydropower station by pressure relief technique

CHEN Fangming1, GU Jianghong1, ZHU Bin1, WANG Luyu2   

  1. 1. No. 3 Engineering Co., Ltd., China Gezhouba Group, Xi'an 710000, Shaanxi, China;
    2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China
  • Received:2017-02-14 Online:2017-04-20 Published:2017-02-14

Abstract: In order to study energy dissipating rate of stress relief technique, the drill core pressure relief and blasting analysis of rock burst area of TBM diversion tunnel in Pakistan N-J Hydropower Station were carried out. Borehole pressure relief and pre-spliting blasting of 108 mm diameter drill core were simulated. The borehole pressure relief and pre-spliting blasting was simulated in spacing of 0.5, 1.0, 1.5, 2.0 and 2.5 m. The numerical simulation results showed that the stress relief in TBM tunnel could reduce stress concentration phenomenon. The effect of pre-spliting blasting was much better than drill core pressure relief. Energy dissipation rate of pre-splitting blasting pressure relief reached 27%, while the energy dissipation rate of the simple borehole pressure relief method was only 5.9%. Pre-spliting blasting pressure relief method should be used to reduce the pressure in the rock burst area in project site. In the condition of pre-splitting blasting, the relationship between energy dissipation rate and spacing is basically exponential growth trend. For drill core pressure relief, the relationship between energy dissipation rate and spacing is positive correlation. It is important that layout of drill spacing should be reasonable planning.

Key words: rock burst, pre-spliting blasting, energy dissipating rate, N-J hydropower station, borehole pressure relief

CLC Number: 

  • TU416.217
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