›› 2012, Vol. 33 ›› Issue (2): 611-616.

• Numerical Analysis • Previous Articles     Next Articles

Study of damage localization of loess multi-arch tunnel’s surrounding rock under dynamic construction

ZHONG Zu-liang1, 2, 3, LIU Xin-rong1, 2, 3, LIU Yuan-xue3, LI Peng1, 2, WANG Ji-ming1, 2   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Education Ministry, Chongqing University, Chongqing 400045, China; 3. Department of Architecture and Civil Engineering, Logistical Engineering University, Chongqing 400041, China
  • Received:2011-04-01 Online:2012-02-10 Published:2012-02-14

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Abstract: In order to study the damage distribution of tunnel’s surrounding rock, firstly, an elastoplastic damage constitutive model of Q2 loess is deduced based on triaxial shear tests and compiled as a user-defined damage model( UDM ) of FLAC3D. Then the conception of surrounding rock damage degree (SRDD) is put forward and compiled into a post-processing module. Based on the first loess multi-arch tunnel of road–Lishi tunnel, the damage position of tunnel’s surrounding rock of two construction schemes is numerically simulated. The research results show that the SRDD and damage localization rules can be simulated well at every excavation step; and it also provides reference for the optimization of tunnel construction scheme. The research results provide a new method for the optimization of tunnel construction scheme and choice of construction scheme.

Key words: constitutive model, damage degree, localization, plan optimization

CLC Number: 

  • TU 43
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