›› 2006, Vol. 27 ›› Issue (S1): 918-920.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on bolt-netting support under high stressed and fractured rockmass

ZHAO Xing-dong1, TANG Chun-an1, ZHANG Guo-lian1, YU Yan-ping2   

  1. 1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China; 2. Xiaoguanzhang Iron Mine, Luzhong Mining Co., Laiwu 271113, China
  • Received:2006-05-26 Published:2006-12-15

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Abstract: The traditional new Austrian tunneling method (NATM) is introduced. From the NATM we know that maintaining the stability of surrounding rockmass must fully utilize and mobilize the strength of surrounding rockmass and its carrying capacity, and depend on co-action mechanism of the surrounding rockmass and support. We study the mechanism of bolt-netting, and setup the mechanic model of high strength and prestressed bolt. We find that the anchor strength of high strength and stressed bolt is related to property of surrounding rockmass, the anchor mode, staff of bolt and the stress of surrounding rockmass, etc. Meanwhile we analyse the co-action mechanism of bolt-netting support and surrounding rockmass, and apply FLAC to study the mechanism of bolt-netting support, and find that the bolt-netting support and surrounding rockmass come into the compressing arch. The roadway depends on the compressing arch resisting the surrounding stress, and maintains the stability of the surrounding rockmass. The deformation and destruction of surrounding rockmass is very serious. By scene test at 41 connecting roadway in the Xiaoguanzhuang Iron Mine, the deformation of roadway is small; the bolt-neting support can maintain the stability of high-stress and fragmented rockmass. The bolt-netting support has the extending and applying value at the similar metal mines.

Key words: shotcrete, bolt-netting support, support parameter, high stressed and fragmentized rock, NATM

CLC Number: 

  • TU 443
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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