Volume 37 Issue 2
Apr.  2023
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Li Qiang, Huang Feng, Gan Lisong. Mechanism and Discrimination of the Large Deformation of Schist Highway Tunnel in Proximal Parallel Tectonic Environment[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(2): 186-193. doi: 10.3969/j.issn.1007-2993.2023.02.010
Citation: Li Qiang, Huang Feng, Gan Lisong. Mechanism and Discrimination of the Large Deformation of Schist Highway Tunnel in Proximal Parallel Tectonic Environment[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(2): 186-193. doi: 10.3969/j.issn.1007-2993.2023.02.010
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Mechanism and Discrimination of the Large Deformation of Schist Highway Tunnel in Proximal Parallel Tectonic Environment

doi: 10.3969/j.issn.1007-2993.2023.02.010

  • Sichuan Communication Surveying & Design Institute Co., Ltd., Chengdu 610017, Sichuan, China

  • Received Date: 2021-12-22
  • Accepted Date: 2022-08-25
  • Rev Recd Date: 2022-07-01
  • Publish Date: 2023-04-08
    Abstract
  • The large deformation occurred several times since Derong No. 1 tunnel was excavated to its deep buried section, which seriously affected the construction safety and the construction period. In order to take targeted and effective prevention measures to control the large deformation of tunnel surrounding rock, the controlled factors and failure mechanism of the large deformation of surrounding rock are comprehensively analyzed. The results show that the large deformation of tunnel surrounding rock was induced by the coupling mechanism of the plastic flow deformation, plastic shear slip deformation, dipping layered bending deformation and progressive looseness extension deformation, which was promoted by engineering disturbed factors under the mutual coupling effect of weak surrounding rock, crushed rock structure, high crustal stress, groundwater and serious deviatoric pressure. On this basis, according to the current traffic industry norms and combined with the deformation characteristics, it is summarized that the comprehensive index scheme for the large deformation grading of surrounding rock in the construction site of two-lane highway tunnel. It provides a more reasonable and reliable basis for guiding the tunnel construction design.

     

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