JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (2): 32-36.doi: 10.6040/j.issn.1672-3961.0.2017.096

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Application of the ‘iron grate’ program in the area of rock burst

WANG Taixing1, WANG Xikui1, ZOU Junpeng2, TAN Xuyan2   

  1. 1. No. 3 Engineering Co., Ltd., China Gezhouba Group, Xi'an 710000, Shaanxi, China;
    2. State Key Laboratory of Geo-mechanics and Geo-technical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430000, Hubei, China
  • Received:2017-02-14 Online:2017-04-20 Published:2017-02-14

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Abstract: To reduce the scale of rockburst control, the “iron grate” or “steel bar” scheme was analysed in this paper. The kinetic energy of different rockburst grades was calculated by using the elastic energy density of the surrounding rock mass after tunnel excavation. Based on the back analysis results of NJ-TBM tunnel ground stress and the stress release hole adopting in the engineering area, the maximum rock mass and the maximum velocity of different rockburst zones were determined. A “iron bar or bar row” solution was established by assuming that the maximum rock mass was impacted at the maximum speed to the steel plate / steel bar.Based on the model, the proposed scheme was applied to the strong rockburst, medium rockburst and weak rockburst respectively. The results showed that the program of steel arch spacing 1.5 m and the number of “iron grate”(Φ=20 mm)was 30 at each extension in the strong rockburst area hasnt appeared plastic area. The program of steel arch spacing 1.7 m and the number of “iron grate”(Φ=22 mm)was 20 at each extension in Medium rockburst area, the program of steel arch spacing 2.0 m and the number of “iron grate”(Φ=20 mm)was 20 at each extension in weak rockburst area hasnt appeared plastic area.So the proposed scheme wasnt produced plastic zone in the rockburst area.

Key words: back analysis, kinetic energy, application, esteel barr scheme, calculation model, rockburst, plastic zone

CLC Number: 

  • TU416.217
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