›› 2010, Vol. 31 ›› Issue (2): 416-421.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Creep tests on shale of cracking position in Gonghe tunnel and simulating it by DEM

REN Song1, 2, JIANG De-yi1, YANG Chun-he1, 2, TENG Hong-wei1   

  1. 1. Key Laboratory for Exploitation of Southwestern Resources & the Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044, China; 2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2009-09-17 Online:2010-02-10 Published:2010-03-24

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Abstract:

The geological condition of Gonghe tunnel is very complex. There are many difficulties when the tunnel is being constructed. There are many vertical cracks in the primary support after the tunnel is excavated. The surrounding rock of the cracking position is shale, which is easy weathered, more hydrophilic, water-weakening and creeping and has identified beddings and joints. These properties of the shale have an important impact on the primary support and the long-term stability and reliability of the tunnel. So the creep test of shale is carried out. The strain-time relation curves of different stress levels are obtained by series of tests. The creep model is built and the parameters of it are got. Based on these, the constructing process of the Gonghe tunnel’s cracked segment is studied by DEM. The possible broken mode of the surrounding rock and the force situation of the supporting structure in tunnel are analyzed. The research achievements provide important support for the new supporting structure scheme of the cracked segment in the Gonghe tunnel. So this engineering problem is successfully solved.

Key words: creep test, Gonghe tunnel, shale, vertical cracking, DEM

CLC Number: 

  • TU 458
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