Three-dimensional elastic analysis of rock excavations by using the g2 constant displacement discontinuity methodThree-dimensional elastic analysis of rock excavations by using the g2 constant displacement discontinuity method
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2018-06-052017enA fast computational code is presented that is dedicated for the elastic analysis of three-dimensional excavations and cracks in rocks. The problem is solved on the boundaries that are discretized with a new triangular leaf constant displacement discontinuity element with one collocation point. The creation of the new triangular element was inspired from Mindlin's special version of grade-2 or strain-gradient elasticity theory (second gradient of displacement, g2). This element is characterized by a much better measure of the average stress at the center of gravity of the triangular element compared to that of the classical elasticity element close to regions with stress or strain gradients (e.g. notches, cracks etc). In a verification stage, the accuracy of the computational algorithm for the pressurized penny-shaped and mixed-mode elliptical crack problems that have analytical solutions is demonstrated. More specifically, it is shown that the average error of the crack tip Stress Intensity Factor predicted by the gradient modified method for nine discretizations of varying density is around 3.5% with a máximum error of 5%, while the constant displacement discontinuity element displays errors varying around 14%. Moreover, the new method preserves the simplicity and hence the high speed of the constant displacement discontinuity with only one collocation point per element, but it is far more efficient compared to it, especially close to the crack tips and corners of excavations where the displacement and stress gradients are highest.http://creativecommons.org/licenses/by/4.0/1087-1095ISRM European Rock Mechanics SymposiumISRM European Rock Mechanics Symposium EUROCK 2017Exadaktylos_et_al_Procedia Eng._191_2017.pdfChania [Greece]Library of TUC2018-06-05application/pdf553.8 kBfree
Exadaktylos Georgios
Εξαδακτυλος Γεωργιος
Xiroudakis Georgios
Ξηρουδακης Γεωργιος
Stavropoulou, Maria
Elsevier
Crack
Dislocation
Displacement discontinuity method
Rock excavation
Stress intensity factor