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An elasto‐plastic constitutive model for soft rock with strain softening
Author(s) -
Adachi T.,
Oka F.
Publication year - 1995
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.1610190402
Subject(s) - constitutive equation , softening , plasticity , geotechnical engineering , strain (injury) , materials science , structural engineering , geology , finite element method , composite material , engineering , medicine
Dense sands, overconsolidated clays and soft rocks exhibit strain‐hardening and strain‐softening behaviour in a certain range of confining pressure. The aim of the present paper is to construct a constitutive model of soft rock that can describe not only the strain‐hardening behaviour, but also the strain‐softening behaviour. An elasto‐plastic constitutive model for soft rock is derived by introducing a stress history tensor The preliminary idea was first reported in the reference, the conference paper 16 . This paper is a complete version of the theory with interpretations and experimental validations . The model is evaluated through a comparison of the calculated results and the experimental results of tests on sedimentary soft rock (porous tuff). In addition, the applicability of the model to numerical analyses is discussed in relation to the uniqueness of the solution in initial and boundary value problems.