標題: A CONSTITUTIVE MODEL OF SANDSTONE CONSIDERING THE POST PEAK BEHAVIOR
作者: Jeng, F. S.
Weng, M. C.
Yeh, F. H.
Yang, Y. H.
Huang, T. H.
土木工程學系
Department of Civil Engineering
關鍵字: Constitutive model;Generalized plasticity;Post-peak behavior;Sandstone
公開日期: 1-二月-2019
摘要: In rock engineering, evaluating the post-peak strength and deformation of rock is necessary. To explore the elasto-plastic behavior of sandstone in the post-peak stage, a series of strain-controlled triaxial tests were conducted under different confining pressures. According to the post-peak characteristics, a constitutive model based on nonlinear elasticity and generalized plasticity is proposed. This proposed model is characterized by the following features: (1) Nonlinear elasticity is observed under hydrostatic and shear loading; (2) the associated flow rule is followed; (3) substantial plastic deformation occurs during shear loading; and (4) post-peak softening behavior is accurately predicted. This model requires twelve material parameters, three for elasticity and nine for plasticity. The proposed model was validated by comparing the triaxial test results of Mushan sandstone at different hydrostatic pressures under dry and saturated conditions. In addition, the model is versatile; it can simulate the deformational behavior of two other sandstones. In summary, the proposed model can reasonably predict the complete stress-strain curve of sandstone.
URI: http://dx.doi.org/10.1017/jmech.2017.71
http://hdl.handle.net/11536/149006
ISSN: 1727-7191
DOI: 10.1017/jmech.2017.71
期刊: JOURNAL OF MECHANICS
Volume: 35
起始頁: 13
結束頁: 25
顯示於類別:期刊論文