Improving rockbolt design in tunnels using topology optimisation
Article
Article Title | Improving rockbolt design in tunnels using topology optimisation |
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ERA Journal ID | 4202 |
Article Category | Article |
Authors | Nguyen, Tin (Author), Ghabraie, Kazem (Author), Tran-Cong, Thanh (Author) and Fatahi, Behzad (Author) |
Journal Title | International Journal of Geomechanics |
Journal Citation | 16 (1) |
Number of Pages | 14 |
Year | 2016 |
Publisher | American Society of Civil Engineers |
Place of Publication | United States |
ISSN | 1532-3641 |
1943-5622 | |
Digital Object Identifier (DOI) | https://doi.org/10.1061/(ASCE)GM.1943-5622.0000488 |
Web Address (URL) | http://ascelibrary.org/doi/abs/10.1061/(ASCE)GM.1943-5622.0000488 |
Abstract | Finding an optimum reinforcement layout for underground excavation can result in a safer and more economical design, and therefore is highly desirable. Some works in the literature have applied topology optimization in tunnel reinforcement design in which reinforced rock is modeled as homogenized isotropic material. Optimization results, therefore, do not clearly show reinforcement distributions, leading to difficulties in explaining the final outcomes. In order to overcome this deficiency, a more sophisticated modelling technique in which reinforcements are explicitly modeled as truss elements embedded in rock mass media is employed. An optimization algorithm extending the Solid Isotropic Material with Penalization (SIMP) method is introduced to seek for an optimal bolt layout. To obtain the stiffest structure with a given amount of reinforced material, external work along the opening is selected as the objective function with a constraint on volume of reinforcement. The presented technique does not depend on material models used for rock and reinforcements and can be applied to any material model. Nonlinear material behavior of rock and reinforcement is taken into account in this work. Through solving some typical examples, the proposed approach is proved to improve the conventional reinforcement design and provide clear and practical reinforcement layouts. |
Keywords | tunnel reinforcement; rock bolt; topology optimisation; SIMP method |
ANZSRC Field of Research 2020 | 400502. Civil geotechnical engineering |
490304. Optimisation | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Computational Engineering and Science Research Centre |
School of Civil Engineering and Surveying | |
University of Technology Sydney | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q32w3/improving-rockbolt-design-in-tunnels-using-topology-optimisation
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