›› 2011, Vol. 32 ›› Issue (1): 237-243.

• Numerical Analysis • Previous Articles     Next Articles

Constitutive model of anchorage interface in underground engineering and its time-effect analysis

WU Guo-jun1，CHU Yi-dun2，CHEN Wei-zhong 1, 3，WANG Yong-gang4, 5   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Second Highway Consultants Co. Ltd., China Communications Construction Corporation, Wuhan 430056, China; 3.Research Center of Geotechnical & Structural Engineering, Shandong University, Ji’nan 250061, China; 4. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 5. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
  • Received:2010-05-06 Online:2011-01-10 Published:2011-01-19

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Abstract:

The rheological property of anchorage interface is one of important problems of anchorage time-effect in underground engineering. Aiming at the defects of hard contact formulation in normal direction and discontinuity from bond to slip in tangential direction when analyzing long-term stability of underground engineering, a contact formulation which is an exponential softened pressure-overclosure relationship in normal direction and a continuous nonlinear constitutive model in tangential direction are proposed. The model solves the problem of converging hardly and reflects the process of shear rheological behavior truly and reasonably because of its consideration of normal stress. By the further development of ABAQUS code, the nonlinear rheological model of anchorage interface is applied to analyzing time-effect of anchorage in underground engineering. The main achievements are conducted as follows: anchor stress will increase with shear rheology of anchorage interface, the location of anchorage peak stress will change and move towards the end of anchor with the lapse of time. The research results provide the theoretical basis for deeply researching the reliability of anchorage in underground engineering.

Key words: anchorage, interface mechanics, constitutive model, time-effect

CLC Number: 

  • TU 470
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