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Improving rockbolt design in tunnels using topology optimization

Nguyen, Tin, Ghabraie, Kazem, Tran-Cong, Thanh and Fatahi, Behzad 2016, Improving rockbolt design in tunnels using topology optimization, International journal of geomechanics, vol. 16, no. 1, Article number : 04015023, pp. 1-14, doi: 10.1061/(ASCE)GM.1943-5622.0000488.

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Title Improving rockbolt design in tunnels using topology optimization
Author(s) Nguyen, Tin
Ghabraie, Kazem
Tran-Cong, Thanh
Fatahi, Behzad
Journal name International journal of geomechanics
Volume number 16
Issue number 1
Season Article number : 04015023
Start page 1
End page 14
Total pages 14
Publisher American Society of Civil Engineers
Place of publication Reston, Va.
Publication date 2016-02
ISSN 1532-3641
Keyword(s) tunnel reinforcement
rockbolt
topology optimization
SIMP method
Summary Finding an optimum reinforcement layout for underground excavation can result in a safer and more economical design, and is therefore 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. To overcome this deficiency, a more sophisticated modeling technique in which reinforcements are explicitly modeled as truss elements embedded in rock mass media is used. An optimization algorithm extending the solid isotropic material with penalization 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 the 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 considered in this work. Through solving some typical examples, the proposed approach is proved to enhance the conventional reinforcement design and provide clear and practical reinforcement layouts.
Language eng
DOI 10.1061/(ASCE)GM.1943-5622.0000488
Field of Research 090501 Civil Geotechnical Engineering
010303 Optimisation
Socio Economic Objective 880102 Rail Infrastructure and Networks
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, American Society of Civil Engineers
Persistent URL http://hdl.handle.net/10536/DRO/DU:30084180

Document type: Journal Article
Collection: School of Engineering
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Created: Tue, 14 Jun 2016, 09:31:26 EST

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