›› 2009, Vol. 30 ›› Issue (11): 3481-3485.

• Numerical Analysis • Previous Articles     Next Articles

Numerical analysis of a collapsed portal for shallow tunnel under asymmetrical pressure and its treatment

WANG Hong1，JIANG Chao1, 2   

  1. 1. Institute of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China, 2. Department 1 of Architectural Design , Changsha Planning and Design Institute Co., Ltd., Changsha 410007, China
  • Received:2008-07-24 Online:2009-11-10 Published:2010-01-07

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Abstract:

During construction of the portal for a tunnel, collapse accident occurred. According to the field geological and construction conditions, the numerical model is set up; and the commercial software ANSYS is adopted to simulate the behaviors of the tunnel and surrounding rock. Based on the results of plastic zones in surrounding rocks, deformations in rock and lining, and the inner forces within rock bolts and reinforced concrete lining, the deformation of the tunnel and the causes of tunnel collapse are analyzed. The results show that: shallow tunnel bias, poor mechanical properties of rock and construction support landslides resulting from collapse. The comprehensive remedy measures consisting of reinforcement inside, surface grouting reinforcement and excavation control are proposed. Good results are achieved so as to offer reference for the future similar projects.

Key words: shallow tunnel, asymmetrical pressure, collapse, numerical analysis

CLC Number: 

  • U 45
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