›› 2010, Vol. 31 ›› Issue (6): 1956-1964.

• Numerical Analysis • Previous Articles     Next Articles

Second development of improved Burgers creep damage constitutive model of rock based on FLAC3D

YANG Wen-dong1，ZHANG Qiang-yong1，ZHANG Jian-guo1, 2，HE Ru-ping3，ZENG Ji-quan3   

  1. 1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China; 2. Shandong Zhengyuan Construction Engineering Co., Ltd, Jinan 250014, China; 3. Chengdu Hydroelectric Investigation & Design Institute, China Hydropower Engineering Consulting Group Corporation, Chengdu 610072, China
  • Received:2008-09-10 Online:2010-06-10 Published:2010-06-25

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Abstract:

Time-dependent deformation behavior of rock has a significant impact on the stability of rock slopes or underground constructions, and more and more attention is paid to the rheology of rock. However, most rock rheological constitutive models supplied by FEM software have specific usage, and the requirement of engineering numerical analysis can not be satisfied. In this paper, the deterioration effect of the rock parameters is considered and an improved Burgers creep damage constitutive model with variable parameters is established. In this model, the creep parameters of the rock deteriorate with time gradually that makes up the defect of rheology models in FLAC3D. Based on the second development program interface of FLAC3D Version 2.1 software, the basic principle of the second development program for the creep damage is analyzed. The program flow diagram on the special execution of this rheological model and several case techniques that should be taken into account in the process of code compiling are given. Several degradation modes of this model are introduced; and visco-elasticity, plasticity and damage mechanical characters are got through a numerical example. The influence of damage parameters on creep curve is analyzed; and the approach to verify the right and credibility of the second development program compiling is proposed. The second development environment is more friendly and effective with the support of object-oriented approach. Therefore, proposed design mode can bring forward references for the second development of other rheological models.

Key words: rock mechanics, creep damage model, second development, code development

CLC Number: 

  • TU 45
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