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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 94
PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by:
Paper 124
An Anisotropic Degradation Model for Weak Sandstone considering Time Dependent Deformation M.C. Weng1, F.S. Jeng2, C.Y. Liao3 and L.S. Tsai4
1Department of Civil and Environmental Engineering, National University of Kaohsiung, Taiwan
Full Bibliographic Reference for this paper
M.C. Weng, F.S. Jeng, C.Y. Liao, L.S. Tsai, "An Anisotropic Degradation Model for Weak Sandstone considering Time Dependent Deformation", in , (Editors), "Proceedings of the Seventh International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 124, 2010. doi:10.4203/ccp.94.124
Keywords: weak sandstones, constitutive model, creep.
Summary
In the western part of Taiwan, weak sandstones are often encountered during tunnel construction, and these materials exhibit relatively low shear strength, enormous dilation, and significant creep deformation. According to the test results of previous researchers [1,2,3], weak sandstones typically exhibit the following behavior:
As a result, this proposed constitutive model is characterized by the following features: (1) being capable of describing shear-induced volumetric deformation, either compression or dilation, prior to the failure state; (2) being versatile in the time-dependent (creep) deformation (3) the anisotropic factor beta 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. References
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