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Three-dimensional elastic analysis of rock excavations by using the g2 constant displacement discontinuity method

Exadaktylos Georgios, Xiroudakis Georgios, Stavropoulou, Maria

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URIhttp://purl.tuc.gr/dl/dias/DE6B163D-FA5B-4622-A42F-BA5613FD595C-
Identifierhttps://www.sciencedirect.com/science/article/pii/S1877705817324220?via%3Dihub-
Identifierhttps://doi.org/10.1016/j.proeng.2017.05.282-
Languageen-
Extent9 pagesen
TitleThree-dimensional elastic analysis of rock excavations by using the g2 constant displacement discontinuity methoden
CreatorExadaktylos Georgiosen
CreatorΕξαδακτυλος Γεωργιοςel
CreatorXiroudakis Georgiosen
CreatorΞηρουδακης Γεωργιοςel
CreatorStavropoulou, Mariaen
PublisherElsevieren
Content SummaryA 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.en
Type of ItemΠλήρης Δημοσίευση σε Συνέδριοel
Type of ItemConference Full Paperen
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2018-06-05-
Date of Publication2017-
SubjectCracken
SubjectDislocationen
SubjectDisplacement discontinuity methoden
SubjectRock excavationen
SubjectStress intensity factoren
Bibliographic CitationG. Exadaktylos, G. Xiroudakis and M. Stavropoulou, "Three-Dimensional Elastic Analysis of Rock Excavations by Using the g2 Constant Displacement Discontinuity Method " in ISRM European Rock Mechanics Symposium, vol. 191, 2017, pp.1087-1095. doi: 10.1016/j.proeng.2017.05.282en

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