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Metal Mine ›› 2016, Vol. 45 ›› Issue (01): 151-156.

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Stability comparison of the roadway supporting by different types of anchor under complicated stress conditions in Jinchuan No.3 mine area

Qu Biao1,He Zhiliang1,Wang Daguo1,Li Bin1,Feng Liang2   

  1. 1.Schoo of Environment & Resource,Southwest University of Science & Technology,Mianyang 621010,China;2.Jinchuan Group Co.,Ltd.,Jinchang 737100,China
  • Online:2016-01-15 Published:2016-03-11

Abstract: With 1 110 m sublevel drift of Jinchuan No.3 Mine Area as engineering background,and in order to solve the issues of serious roadway damage and higher repair rate,the numerical analysis on the supporting effect of expanding-shell hollow pre-stressed anchor and full-length mortar anchor were conducted by FLAC3D numerical simulation software.The differences of roadway deformation,surrounding stress field,plastic zone and stress concentration factor in two conditions are contrasted:one was the different angle between the maximum horizontal principal stress and roadway axis of the two bolt supports,the other was the different maximum horizontal principal stress with the same angle.And compared with the field test data,it was found that the effect for controlling the two sides’ displacement of the roadway supported by expanding-shell hollow pre-stressed anchor is much better than mortar bolt.Besides,the tress in the roadway periphery which supported by expanding-shell hollow pre-stressed anchor is more balanced,which contributes to the long-term stability of the roadway and can prolong the roadway maintenance cycle and reduce the repair rate.

Key words: Roadway supporting, Complicated stress, Pre-stressed anchor, Stability