A coupled elastoplastic damage model for brittle rocks and its application in modelling underground excavation

This study develops a coupled elastoplastic damage model for brittle rocks within the framework of irreversible thermodynamics. In the model, degradations in the deformation and strength of rocks induced by damage are considered in the elastic stiffness matrix and plastic yield criterion. The thermo...

Celý popis

Uloženo v:
Podrobná bibliografie
Vydáno v:International journal of rock mechanics and mining sciences (Oxford, England : 1997) Ročník 84; s. 130 - 141
Hlavní autoři: Zhang, J.C., Xu, W.Y., Wang, H.L., Wang, R.B., Meng, Q.X., Du, S.W.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 01.04.2016
Témata:
Computer simulation
Coupled elastoplastic damage model
Damage
Finite element method
Joining
Mathematical analysis
Mathematical models
Numerical implementation
Rock damage
Rocks
Thermodynamics
Underground excavation
Rock damage
Coupled elastoplastic damage model
Underground excavation
Numerical implementation
ISSN:1365-1609, 1873-4545
On-line přístup:Získat plný text
Tagy: Přidat tag
Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!
Popis
Shrnutí:This study develops a coupled elastoplastic damage model for brittle rocks within the framework of irreversible thermodynamics. In the model, degradations in the deformation and strength of rocks induced by damage are considered in the elastic stiffness matrix and plastic yield criterion. The thermodynamic force associated with damage is expressed as a state function of elastic strain and the internal plastic variable. The damage potential and criterion, as functions of the thermodynamic force, are constructed to describe the damage evolution of rocks, and to determine whether they are damaged, respectively. Constitutive relationships, and their numerical formulations of a return mapping algorithm for finite element method implementation, are deduced under three different loading conditions: damage, plastic and coupled plastic damage. For engineering application, the developed model is implemented in the finite element programme Abaqus as a user-defined material model (UMAT). The coupled model is then used for simulating the re-distributed stress fields, displacement and EDZs of the sidewall rock mass around the underground powerhouse of the Wudongde hydropower plant. •Develop a coupled elastoplastic damage model for brittle rocks.•Propose computation procedure for decoupling plasticity and damage.•Simulate pre- and post-peak plastic deformation and damage failure of a limestone.•Use it to model the excavation and evaluating the EDZs of an underground powerhouse.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1365-1609
1873-4545
DOI:10.1016/j.ijrmms.2015.11.011