JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (2): 41-46.doi: 10.6040/j.issn.1672-3961.0.2017.026

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Analysis of pre-splitting blasting in rock burst area of N-J hydropower station

NING Guangzhong1, HU Quanguang1, YAN Xiao1, 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:2017-01-16 Online:2017-04-20 Published:2017-01-16

Abstract: In order to analyse pressure relief of the rock burst area of N-J hydropower station diversion tunnel in Pakistan, the rock burst proneness test of sandstone SS-1 inconstruction area was presented, and the elastic energy index was used as judgingrock burst proneness. The results showed that the construction area was strong rock burst area.It was necessary torelease the stress of drill hole by presplitting blasting.The numerical simulation of presplitting blasting was presented by extended finite element method(XFEM). Considering spacing and tensile strength, the simulation of borehole stress relief included the results that tensile strength was 4,6,8,10 MPa when spacing was 0.5,1.0,1.5, 2.0,2.5 m respectively. The energy dissipating rates and minimum impact forces to drill hole wall were analysed. The results of numerical analysis showed that the energy dissipation rate of presplitting blasting increased with the spacing of drill hole presenting a trend of exponential form. When the calculated impact stress was less than the rock limited dynamic tensile strength, the blasting wouldnt cause the blasting of the blasting wall. In order to ensure the pressure relief effect, spacing of drill hole should be optimal layout.

Key words: N-J hydropower station, XFEM, rock burst, presplitting blasting, stress relief

CLC Number: 

  • U455.6
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