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International Journal for Multiscale Computational Engineering

Erscheint 6 Ausgaben pro Jahr

ISSN Druckformat: 1543-1649

ISSN Online: 1940-4352

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.4 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.3 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 2.2 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00034 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.46 SJR: 0.333 SNIP: 0.606 CiteScore™:: 3.1 H-Index: 31

Indexed in

Damage Evolution in an Underground Gallery Induced by Drying

Volumen 7, Ausgabe 2, 2009, pp. 65-89
DOI: 10.1615/IntJMultCompEng.v7.i2.20
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ABSTRAKT

We study the structural behavior of a rock mass made of argillite, from which a cylindrical underground opening was excavated. Prescribing that the relative humidity of the air within the gallery is < 100% causes the surrounding clay-containing, sedimentary rock to desaturate and to dry progressively. Because near-surface layers dry faster than the domains behind, shrinkage deformations are hindered, which promotes the cracking risk of the material. This phenomenon is studied by means of a multiscale approach which involves four separated scales of observation, including consideration of two types of rock mass porosity: (i) meso- cracks in form of oblate spheroids and (ii) spherical micropores. Assuming macroscopic radial symmetry, the drying-related fluid transport problem is solved first, which results in computed fields of capillary pressure and gas pressure, covering the first 50 years after gallery excavation. These data allow for deriving the pressure fields within mesocracks and within micropores, on lower scales of observation. Homogenization based on a microporomechanics approach delivers the related macroscopic prestresses, which enter the structural analysis of the deformation behavior of the rock mass. Accompanying the structural drying analysis, the mesocrack propagation risk is continuously monitored by means of a thermodynamics-based crack propagation law. Once onset of mesocrack propagation is observed, damage evolution is modeled. This engineering combination of a microporomechanical material model with a computational tool for macroscopic structural analysis allows for studying the expansion of a drying-related damage front that propagates-at rather small speed-into the rock mass. This effect should be dealt with carefully when planning to use such an underground gallery as a disposal site for atomic waste

REFERENZIERT VON
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