• ISSN 0258-2724
  • CN 51-1277/U
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Volume 27 Issue 2
Apr.  2014
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Journal of Southwest Jiaotong University  > 2014  >  27(2): 254-259.
YANG Chengyong, OUYANG Jie, LU Jinghui. Assessment on Safety of Steel Reinforced Shotcrete Support for Tunnels[J]. Journal of Southwest Jiaotong University, 2014, 27(2): 254-259. doi: 10.3969/j.issn.0258-2724.2014.02.011
Citation: YANG Chengyong, OUYANG Jie, LU Jinghui. Assessment on Safety of Steel Reinforced Shotcrete Support for Tunnels[J]. Journal of Southwest Jiaotong University, 2014, 27(2): 254-259. doi: 10.3969/j.issn.0258-2724.2014.02.011
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Assessment on Safety of Steel Reinforced Shotcrete Support for Tunnels

doi: 10.3969/j.issn.0258-2724.2014.02.011
  • Received Date: 17 Mar 2013
  • Publish Date: 25 Mar 2014
    Abstract
  • A displacement-based method was proposed to evaluate the safety of steel reinforced shotcrete support for tunnels under construction. Based on shotcrete creep experiment, a GL2000 model was modified and employed to describe the creep of shotcrete. Formulas to calculate the axial deformation and curvature change of the support were obtained. Formulas to compute the internal forces of the support with creep considered were given, and performance functions to a cross-section of the support were put forward. At last, a case study was done for a tunnel on the Wuhan-Guangzhou railway line. The case research result shows that results based on the proposed method are consistent with in-situ situations. Calculated reliability indices fall into the interval required by the related Chinese codes. Creep causes the shotcrete to relax to result in large reliability indices, but the increase of the indices is smaller than those for plain shotcrete and lattice girder reinforced shotcrete supports.

     

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