Analysis of tunnel excavation based on linear DFN-FEM modelling
Simulations of tunnel excavations have to take into account the natural occurrence of joints and faults in the surrounding rock mass, which dominantly control its mechanical response. In this paper, we present work in progress toward 3D finite element analysis of excavation using equivalent rock-ma...
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| Format: | Article |
| Language: | English |
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CTU Central Library
2023-07-01
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| Series: | Acta Polytechnica CTU Proceedings |
| Subjects: | |
| Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/9221 |
| _version_ | 1797743619618111488 |
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| author | Martin Lebeda Petr Kabele |
| author_facet | Martin Lebeda Petr Kabele |
| author_sort | Martin Lebeda |
| collection | DOAJ |
| description |
Simulations of tunnel excavations have to take into account the natural occurrence of joints and faults in the surrounding rock mass, which dominantly control its mechanical response. In this paper, we present work in progress toward 3D finite element analysis of excavation using equivalent rock-mass properties derived from stochastically generated discrete fracture networks (DFNs). The equivalent stiffness is determined by volume averaging. Presently, we solve the problem linearly for an incremental change of the stress state. The fracture’s stiffness is assumed to depend on the initial normal stress acting in direction normal to it. However, within the solved incremental step, we assume the fracture’s stiffness to be constant. This assumption is acceptable for small stress changes. Since the fractures represented in the DFN model have preferred directions, the equivalent stiffness is anisotropic.
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| first_indexed | 2024-03-12T14:58:03Z |
| format | Article |
| id | doaj.art-f4ffd35620de49f1b75623379f903944 |
| institution | Directory Open Access Journal |
| issn | 2336-5382 |
| language | English |
| last_indexed | 2024-03-12T14:58:03Z |
| publishDate | 2023-07-01 |
| publisher | CTU Central Library |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj.art-f4ffd35620de49f1b75623379f9039442023-08-14T12:14:25ZengCTU Central LibraryActa Polytechnica CTU Proceedings2336-53822023-07-014010.14311/APP.2023.40.0061Analysis of tunnel excavation based on linear DFN-FEM modellingMartin Lebeda0Petr Kabele1Czech Technical University in Prague, Faculty of Civil Engineering, Department of Mechanics, Thákurova 7, 166 29 Prague 6, Czech RepublicCzech Technical University in Prague, Faculty of Civil Engineering, Department of Mechanics, Thákurova 7, 166 29 Prague 6, Czech Republic Simulations of tunnel excavations have to take into account the natural occurrence of joints and faults in the surrounding rock mass, which dominantly control its mechanical response. In this paper, we present work in progress toward 3D finite element analysis of excavation using equivalent rock-mass properties derived from stochastically generated discrete fracture networks (DFNs). The equivalent stiffness is determined by volume averaging. Presently, we solve the problem linearly for an incremental change of the stress state. The fracture’s stiffness is assumed to depend on the initial normal stress acting in direction normal to it. However, within the solved incremental step, we assume the fracture’s stiffness to be constant. This assumption is acceptable for small stress changes. Since the fractures represented in the DFN model have preferred directions, the equivalent stiffness is anisotropic. https://ojs.cvut.cz/ojs/index.php/APP/article/view/9221fractured rock massdiscrete fracture network (DFN)finite element method (FEM)averaging procedure |
| spellingShingle | Martin Lebeda Petr Kabele Analysis of tunnel excavation based on linear DFN-FEM modelling Acta Polytechnica CTU Proceedings fractured rock mass discrete fracture network (DFN) finite element method (FEM) averaging procedure |
| title | Analysis of tunnel excavation based on linear DFN-FEM modelling |
| title_full | Analysis of tunnel excavation based on linear DFN-FEM modelling |
| title_fullStr | Analysis of tunnel excavation based on linear DFN-FEM modelling |
| title_full_unstemmed | Analysis of tunnel excavation based on linear DFN-FEM modelling |
| title_short | Analysis of tunnel excavation based on linear DFN-FEM modelling |
| title_sort | analysis of tunnel excavation based on linear dfn fem modelling |
| topic | fractured rock mass discrete fracture network (DFN) finite element method (FEM) averaging procedure |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/9221 |
| work_keys_str_mv | AT martinlebeda analysisoftunnelexcavationbasedonlineardfnfemmodelling AT petrkabele analysisoftunnelexcavationbasedonlineardfnfemmodelling |