JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2018, Vol. 48 ›› Issue (2): 53-60.doi: 10.6040/j.issn.1672-3961.0.2017.058

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Deformation characteristic and instability analysis for shallow soft rock section during tunnel-entering construction

SONG Guijie   

  1. The 2nd Engineering Co.Ltd, China Railway 14th Bureau Group, Tai'an 271000, Shandong, China
  • Received:2017-02-19 Online:2018-04-20 Published:2017-02-19

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Abstract: For the collapse accident and stability problem of shallow soft rock section during tunnel construction, tunnel geological conditions were effectively identified, and a 3D model were set up for analysis based on the result of geological radar and the monitoring data of surrounding rock. The results showed that a significant plastic deformation zone was formed on the arch and vault during the tunnel excavation process. With the tunnel face gradually close to the broken zone of the surrounding rock, the range of plastic zone was gradually enlarged and transferred to the top right of the vault and its surrounding rock. The stress level was relatively low. The vertical displacement of the broken area increased significantly, and the integrity of the surrounding rock was greatly reduced. The main reason for the large deformation of the tunnel was the poor geological structure and the mechanical properties of the surrounding rock due to rainfall and surface water infiltration accelerated the tunnel disaster. For the construction of the tunnel soft rock section in the five class surrounding rock, analysis of the monitoring should be strengthened and early warning should be made in time, the advance geological forecast should be developed in the key parts. The results of the study could give guide to the prevention and control of the landslide of the tunnel disaster, which was of great significance for tunnel informatization construction.

Key words: informatization construction, monitoring measurement, large deformation, shallow-buried tunnel, numerical simulation, advance geological forecast, collapse accident

CLC Number: 

  • U459.2
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