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Improving rockbolt design in tunnels using topology optimization

journal contribution
posted on 2016-02-01, 00:00 authored by T Nguyen, Kazem GhabraieKazem Ghabraie, T Tran-Cong, B Fatahi
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.

History

Journal

International Journal of Geomechanics

Volume

16

Article number

ARTN 04015023

Location

Reston, Va.

ISSN

1532-3641

eISSN

1943-5622

Language

English

Publication classification

C Journal article, C1.1 Refereed article in a scholarly journal

Copyright notice

2016, American Society of Civil Engineers

Issue

1

Publisher

ASCE-AMER SOC CIVIL ENGINEERS