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Research project (§ 26 & § 27)
Duration : 2022-01-01 - 2023-12-31

In this research project, a 3D grain-scale continuum-discontinuum hierarchical multiscale computational framework is proposed to improve the deep understanding of compaction banding formations in the sedimentary porous rocks that are of strong interest and of major challenge in the modern geomechanics. The proposed grain-scale continuum-discontinuum multiscale numerical framework for porous geological media consists of three levels including FEM meshes at macro-scale, DEM grains at meso-scale and hypoplastic peridynamic points at micro-scale. Furthermore, the region partitioning search algorithm and CPU-GPU heterogeneous computing architecture both contribute to improvement of computational efficiency to construct an open-source 3D computational platform that is suitable to simulate large-scale geological and geotechnical problems. To systematically investigate the localized failure mechanism of compaction bands in porous geological media at laboratory and field scales, one laboratory-scale and one field-scale numerical models are simulated by 3D computational platform. The influencing factors of boundary conditions, stress fields, geomaterials heterogeneity, nonlocal characteristic length, granular shapes, etc. on the localization failure processes of compaction bands will be summarized and analyzed. Sequentially, effects of microstructural mechanism including pore collapse, grain debonding, intra-granular damage and grain crushing on the nucleation and propagation of compaction bands during the localized failure processes. Furthermore, localized failure mechanism of the geological tectonic phenomena, i.e., coexistence of pure compaction bands and shear enhanced bands, will be numerical explored .
Research project (§ 26 & § 27)
Duration : 2021-10-11 - 2022-01-10

Within the scope of this proposal, “mountain geohazards” are understood as extremely rapid, gravitationally driven processes which typically occur in mountain areas and are potentially hazardous for society. Such processes are e.g. landslides in the very broad sense of the term, snow avalanches, glacial lake outburst floods, or process chains involving one or more of those phenomena. Mountain geohazards lead to significant losses of life, public infrastructure, and private property every year, all around the world. Disasters resulting from inadequate risk governance act against the SDGs 3, 9, and 11, among others. Whereas it is well established that societal change along with increased exposure has resulted in increasing losses and disasters, it is unclear to what extend and at what time-scale certain geohazard processes are affected by climate change. An increased understanding of all aspects of mountain geohazards now and in the future, from triggering to process dynamics and societal impact and perception, requires concerted inter- and transdisciplinary efforts and is necessary to inform risk governance and ultimately reduce losses. Austria is not only a country frequently affected by mountain geohazards, but also having developed a highly active scientific community and a powerful research infrastructure to investigate both the relevant physical processes and their socio-economic consequences. The proposed Cluster of Excellence aims at further strengthening and extending the available expertise and networks, in order to form an even stronger basis for risk governance efforts not only in Austria but also internationally, particularly in the Global South, and to strengthen the role of inter- and transdisciplinary Austrian mountain geohazards research as an international flagship.
Research project (§ 26 & § 27)
Duration : 2021-06-30 - 2024-06-29

This project deals with the centrifuge model tests on the behaviour at tunnel cross-passages. Long tunnels usually consist of two main tunnel tubes, which are connected by cross-passages in certain distances. The connection between the main tunnel and the cross-passage presents a three-dimensional problem. We use centrifuge model tests to study the stress and strain at the tunnel connection. The structural analysis of the tunnel tube in the area of the cross passages are usually carried out during the preliminary design stage. Due to the complex three– dimensional stress–strain field at the intersection between main tunnel and cross passages, analytical calculations are not feasible and the literature provides little to no guidance. The design practice is usually based on simplified two–dimensional calculations supplemented by some instrumentation (monitoring). However, simplified 2D calculations cannot account for the complex interaction between the ground and lining, monitoring is mostly performed ex–post and data interpretation is not straightforward. The aim of this research project is to close this knowledge gap.

Supervised Theses and Dissertations