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A time-dependent anisotropic model for argillaceous rocks: application to an underground excavation in Callovo-Oxfordian claystone
- Source :
- Recercat. Dipósit de la Recerca de Catalunya, instname, Scipedia Open Access, Scipedia SL, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC)
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Abstract
- The paper presents a constitutive model for argillaceous rocks, developed within the framework of elastoplasticity, that includes a number of features that are relevant for a satisfactory description of their hydromechanical behaviour: anisotropy of strength and stiffness, behaviour nonlinearity and occurrence of plastic strains prior to peak strength, significant softening after peak, time-dependent creep deformations and permeability increase due to damage. Both saturated and unsaturated conditions are envisaged. The constitutive model is then applied to the simulation of triaxial and creep tests on Callovo-Oxfordian (COx) claystone. Although the main objective has been the simulation of the COx claystone behaviour, the model can be readily used for other argillaceous materials. The constitutive model developed is then applied, via a suitable coupled hydromechanical formulation, to the analysis of the excavation of a drift in the Meuse/Haute-Marne Underground Research Laboratory. The pattern of observed pore water pressures and displacements, as well as the shape and extent of the damaged zone, are generally satisfactorily reproduced. The relevance and importance of rock anisotropy and of the development of a damaged zone around the excavations are clearly demonstrated.
- Subjects :
- Engineering, Civil
010504 meteorology & atmospheric sciences
Constitutive equation
0211 other engineering and technologies
Engineering, Multidisciplinary
Coupled hydromechanical analysis
02 engineering and technology
01 natural sciences
Pore water pressure
Tonsteins
Tunnel excavation
medicine
Enginyeria civil::Geotècnia::Mecànica de roques [Àrees temàtiques de la UPC]
Elasto-plasticity
Geotechnical engineering
Time-dependent behaviour
Engineering, Ocean
Anisotropy
Softening
Engineering, Aerospace
Engineering, Biomedical
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Stiffness
Excavation
Mecànica de roques
Geotechnical Engineering and Engineering Geology
Computer Science, Software Engineering
Engineering, Marine
Computer Science Applications
Engineering, Manufacturing
Engineering, Mechanical
Permeability (earth sciences)
Creep
Engineering, Industrial
Argillaceous rocks
medicine.symptom
Geology
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Recercat. Dipósit de la Recerca de Catalunya, instname, Scipedia Open Access, Scipedia SL, UPCommons. Portal del coneixement obert de la UPC, Universitat Politècnica de Catalunya (UPC)
- Accession number :
- edsair.doi.dedup.....698dfcda3c1ac2de5ab3f7f6e3bcd89e