Research Article
Optimization of Rock Bolt and Concrete Lining Combination: A Case of AKH Railway Tunnel Project
@INPROCEEDINGS{10.1007/978-3-030-80618-7_3, author={Sinodos S. Sefene and Henok F. Gebregziabher}, title={Optimization of Rock Bolt and Concrete Lining Combination: A Case of AKH Railway Tunnel Project}, proceedings={Advances of Science and Technology. 8th EAI International Conference, ICAST 2020, Bahir Dar, Ethiopia, October 2-4, 2020, Proceedings, Part II}, proceedings_a={ICAST PART 2}, year={2021}, month={7}, keywords={Rock bolt Concrete lining Optimization Finite element method MATLAB}, doi={10.1007/978-3-030-80618-7_3} }- Sinodos S. Sefene
Henok F. Gebregziabher
Year: 2021
Optimization of Rock Bolt and Concrete Lining Combination: A Case of AKH Railway Tunnel Project
ICAST PART 2
Springer
DOI: 10.1007/978-3-030-80618-7_3
Abstract
Concrete lining and rock bolts are usually provided to support excavated tunnels on different ground conditions. These two support systems are worthy and need in-depth consideration as their impact on tunnel cost and deformation are critical. The optimum use of these support systems is a challenge that demands the best design solution. In order to facilitate the determination of the optimal combination of the two, an optimization scheme has been devised in this study using Finite Element Analysis (FEA) and MATLAB software for a specific under-construction tunnel in Karakore, Ethiopia. The tunnel displacements found from the FEA and the cost of tunnel construction were modeled using polynomial functions with a multi-objective optimization since the problem has two objectives. Considering displacement and cost functions, the optimum combination of rock bolt and concrete lining has been found. The result shows that the optimum combination can be found by increasing the number of rock bolts. The finite element analysis gives a total displacement of 6.34 cm in the best scenario case, which is slightly greater than the observed total displacement of about 6 cm. The total cost of rock bolt and concrete lining for the optimum combination becomes $30,700 per meter length of tunnel rock bolt and concrete lining construction.
