A constitutive model for shear induced anisotropic degradation of weak sandstone

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

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

Weak sandstones possess deformational behaviors different from hard rocks; these phenomena, including shear dilation and degradation of deformational moduli, are much more significant. Therefore, a model capable of simulating major deformational characteristics of weak sandstones is essentially needed for engineering purposes. An innovative constitutive model is accordingly proposed. The proposed model was formulated based on the linear elastic model, and it accounts for the variations of moduli K and G through different loading conditions. In addition, an anisotropic factor β is introduced to reflect the stress-induced anisotropy. It was found that the proposed model is able to closely simulate the actual deformational characteristics of weak sandstones. The proposed model was then incorporated into a finite element program and was used to analyze a squeezing tunnel case. Overall, this model can describe the deformation behavior for weak sandstones, especially on the significant shear dilation prior to the failure state. As a result, the proposed model shows the versatility in its applicability.

Original languageEnglish
StatePublished - 1 Jan 2009
EventISRM International Symposium on Rock Mechanics 2009, SINOROCK 2009 - Hong Kong, China
Duration: 19 May 200922 May 2009

Conference

ConferenceISRM International Symposium on Rock Mechanics 2009, SINOROCK 2009
CountryChina
CityHong Kong
Period19/05/0922/05/09

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    Weng, M-C., Liao, C. Y., & Jeng, F. S. (2009). A constitutive model for shear induced anisotropic degradation of weak sandstone. Paper presented at ISRM International Symposium on Rock Mechanics 2009, SINOROCK 2009, Hong Kong, China.