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Elasto-Viscoplastic Behavior of Soft Sedimentary Rock, Tests and Its Modeling
Tests on soft sedimentary rock under plane-strain compression and creep have been conducted. The purpose of the test is to investigate the influence of intermediate principal stress that may greatly affect the strength and stress-dilatancy relation of geologic materials under different loading paths. Yet few plane-strain/true triaxial experiments on soft rock can be seen due to the difficulties of experiment. In the study, a newly designed plane-strain apparatus was utilized, by which an isotropic compression condition was achieved before shear and continuous monitoring of inner excessive pore water pressure during high-speed creep rupture was also obtained. Meanwhile, element simulations by a subloading tij viscoplastic constitutive model for soft rock using tij concept and subloading surface was also conducted. Influence of membrane and filter paper was investigated using finite element analysis based on the viscoplastic model. Furthermore, particular attention was also paid to the migration of excessive pore water pressure within a specimen, which is intimately related to the loading rate.
Elasto-Viscoplastic Behavior of Soft Sedimentary Rock, Tests and Its Modeling
Tests on soft sedimentary rock under plane-strain compression and creep have been conducted. The purpose of the test is to investigate the influence of intermediate principal stress that may greatly affect the strength and stress-dilatancy relation of geologic materials under different loading paths. Yet few plane-strain/true triaxial experiments on soft rock can be seen due to the difficulties of experiment. In the study, a newly designed plane-strain apparatus was utilized, by which an isotropic compression condition was achieved before shear and continuous monitoring of inner excessive pore water pressure during high-speed creep rupture was also obtained. Meanwhile, element simulations by a subloading tij viscoplastic constitutive model for soft rock using tij concept and subloading surface was also conducted. Influence of membrane and filter paper was investigated using finite element analysis based on the viscoplastic model. Furthermore, particular attention was also paid to the migration of excessive pore water pressure within a specimen, which is intimately related to the loading rate.
Elasto-Viscoplastic Behavior of Soft Sedimentary Rock, Tests and Its Modeling
Zhang, Feng. (author) / Yashima, Atsushi (author) / Ye, Guan Lin (author) / Aung, Hla. (author) / Naitou, Kiyokazu (author) / Nakai, Teruo (author)
Second Japan-U.S. Workshop on Testing, Modeling, and Simulation in Geomechanics ; 2005 ; Kyoto, Japan
Geomechanics II ; 148-161
2006-08-28
Conference paper
Electronic Resource
English
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