›› 2012, Vol. 33 ›› Issue (7): 2142-2148.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of deformation and failure mechanism and reinforcement effect of Yangpoli tunnel longitudinally traversing landslide

WANG Yong-gang1, 2, 3, DING Wen-qi1, 2, TANG Xue-jun3   

  1. 1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Gansu Province Transportation Planning, Survey and Design Institute Co., Ltd., Lanzhou 730030, China
  • Received:2010-03-28 Online:2012-07-11 Published:2012-07-13

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Abstract: Based on Yangpoli tunnel in Wudu-Guanzigou expressway, both the interaction mechanism and the deformation and failure mode between tunnel and landslide in the condition of tunnel traversing landslide longitudinally are deeply discussed. On the basis of theoretical analysis, a relevant comprehensive controlling design is put forward. Furthermore, the strength reduction finite element method and limit equilibrium method are carried out to analyze the excavation reinforcement effect for the tunnel crossing landslide. The comparison analysis of stabilities before and after excavation illustrates that under the excavation, the landslide stability meets the design specifications of the code. So far, the engineering is under construction and the safety stability is in good condition. In addition, studies show that: the tunnel structure crossing landslide longitudinally works as a major “anti-sliding structure” in terms of landslide; due to the effect of landslide thrust, the principal stresses of tunnel lining suffer apparent deflection. When entering the stable bedrock, with the increasing of distance between tunnel vault crown and the interface of bedrock and alluvion covering, the principal stresses of tunnel lining gradually transform into normal state. The analysis of tunnel crossing landslide longitudinally and comprehensive controlling scheme will provide a guidance for similar engineering.

Key words: tunnel engineering, landslide, longitudinally traversing, deformation and failure mechanism, reinforcement effect

CLC Number: 

  • U 45
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