An anisotropic degradation model for weak sandstone considering time dependent deformation

Meng-Chia Weng*, F. S. Jeng, C. Y. Liao, L. S. Tsai

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Based on the concept of shear-induced anisotropic degradation, a model involving time dependent behavior is proposed to simulate the deformational characteristics of weak sandstone. The stress-strain relationship of the proposed model was originated from the degradation of moduli K and G subjected to different loading conditions. An anisotropic factor β is introduced to indicate the tendency of shear-induced volumetric deformation. Furthermore, to incorporate time-dependent deformation behavior of sandstone, this anisotropic degradation model is further extended using a generalized Burger's model. As a result, this proposed constitutive model is characterized by the following features: (1) being capable of describing shearinduced volumetric deformation, either compression or dilation, prior to the failure state; (2) being versatile in the time-dependent (creep) deformations (3) the anisotropic factor β serves as a convenient index regarding whether shear-induced volumetric deformation dilates or not; and (4) the number of material parameters is controlled to be as few as possible. The proposed model has been verified by comparing to experimental results. It is found that the proposed model is versatile in simulating short-term and long-term deformations of sandstone under different stress paths.

Original languageEnglish
Title of host publicationProceedings of the 7th International Conference on Engineering Computational Technology
DOIs
StatePublished - 1 Dec 2010
Event7th International Conference on Engineering Computational Technology, ECT 2010 - Valencia, Spain
Duration: 14 Sep 201017 Sep 2010

Publication series

NameProceedings of the 7th International Conference on Engineering Computational Technology

Conference

Conference7th International Conference on Engineering Computational Technology, ECT 2010
CountrySpain
CityValencia
Period14/09/1017/09/10

Keywords

  • Constitutive model
  • Creep
  • Weak sandstones

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  • Cite this

    Weng, M-C., Jeng, F. S., Liao, C. Y., & Tsai, L. S. (2010). An anisotropic degradation model for weak sandstone considering time dependent deformation. In Proceedings of the 7th International Conference on Engineering Computational Technology (Proceedings of the 7th International Conference on Engineering Computational Technology). https://doi.org/10.4203/ccp.94.124