JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2008, Vol. 38 ›› Issue (6): 51-54.

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Research and appication on the supporting technology of a new high-prestressed bolt

  

  1.  LI Hai-Yan,  LI Shu-Cai, LIU Yu-Ping,： Center of Geotechnical Engineering， Shandong University， Jinan  250061, China；
    LI Wei： Xiezhuang Coal Mine, Xinwen Mining Group, Xintai  271221, China；
    GAO Si-Min：Qingdao Jiaozhou Survey and Design Institute of Water Conservacy,  Qingdao 266300, China
  • Received:2008-07-04 Online:2008-12-16 Published:2008-12-16

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Abstract:

The mechanism of jointly deformation-failures between roadway surrounding rock and bolt-support system were studied and summarized. A new steelstrand bolt with high pretension stress was developed in this experiment. This kind of bolt can provide high pre-stress and effectively control the harmful deformation of surrounding rock. In addition, the synchronous deformation between the bolt and rock was achieved, and the self-support power of the bolt can be effectually exerted. At the same time, the prestressed steel-strand bolt is difficult to  be made flexible after being fixed, and is less influenced by shock wave. It was shown that this steel-strand bolt is technically feasible for supporting in roadway and can reduce the cost of support in the same strength condition. It also has the vale of having a wide spread in engineering application as a supporting-system to soft rock in deep mines.

Key words: prestress； steel-strand bolt； elongation； synchronous load bearing

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