›› 2013, Vol. 34 ›› Issue (9): 2629-2637.

• Geotechnical Engineering • Previous Articles     Next Articles

Program implementation of nonlinear rheological model based on yield approach index piecewise function

YANG Wen-dong1, 2，ZHANG Qiang-yong3，LI Shu-cai3，CHEN Fang3，WANG Gang2   

  1. 1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266580, China; 2. State Key Laboratory Breeding Base for Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 3. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China
  • Received:2012-12-23 Online:2013-09-11 Published:2013-09-13

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Abstract: Based on triaxial rheological experiment, a nonlinear visco-elastoplastic rheological model is proposed which has creep threshold value, long-term strength, nonlinear viscoplastic body and other components. There are many problems in programming of this complex rheological model, for example, one-dimensional creep threshold value and long-term strength are difficult to express when extended to three-dimensional, and it was difficult to deal with nonlinear viscoplastic part. The yield approach index parameter is used as identification criterions of the creep equation piecewise function, the problems which the creep threshold value and long-term strength in three-dimension are difficult to express, are solved. The expression of viscoplastic part is derived detailedly; and three-dimensional central difference form is given, therefore, the secondary development of this rheological model for FLAC3D is achieved. A case study is given to verify correctness of program compiling. The rheological parameters are identified, the fitting curves are in good agreement with the experimental curves, so as to indicate that the model is correct and reasonable.

Key words: rock mechanics, nonlinear rheological model, secondary development, piecewise function of creep equation, yield approach index

CLC Number: 

  • O 319.56
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