Geotechnical Engineering Design of a Tunnel Support System - A Case Study of Bheri Babai Headrace Tunnel
 |
International Journal of Engineering Trends and Technology (IJETT) |  |
| © 2019 by IJETT Journal | ||
| Volume-67 Issue-4 |
||
| Year of Publication : 2019 | ||
| Authors : Deepika Ghorasaini, Akal Bahadur Singh |
||
| DOI : 10.14445/22315381/IJETT-V67I4P208 |
Citation
MLA Style: Deepika Ghorasaini, Akal Bahadur Singh "Geotechnical Engineering Design of a Tunnel Support System - A Case Study of Bheri Babai Headrace Tunnel" International Journal of Engineering Trends and Technology 67.4 (2019): 33-37.
APA Style:Deepika Ghorasaini, Akal Bahadur Singh (2019). Geotechnical Engineering Design of a Tunnel Support System - A Case Study of Bheri Babai Headrace Tunnel. International Journal of Engineering Trends and Technology, 67(4), 33-37.
Abstract
The analysis of rock mass strength, geological problem related to tunnel construction and designing appropriate support system for Bheri Babai Headrace Tunnel (BBDMP) is presented in the paper. Tunnel squeezing and rock burst is checked before design of support system. Rock mass classification system (Q and RMR) are used as empirical method to obtain recommended support system. For analytical solution Convergent confinement method is used to determine required support pressure to resist displacement. Finite element modelling using Phase 2 version 7.013 is used to check the ground condition and stress concentration around the tunnel providing support systemfor resisting the deformation. The displacement and radius of plastic zone is reduced after installation of support shown by obtained results. The first two method i.e. empirical and analytical provide first estimate to design while numerical method can be used to verify the performance of support system. Hence design method providing maximum factor of safety should is recommended.
Reference
[1] www.bbdmp.gov.np
[2] Singh, B., & Goel R. (2006). Tunnelling in weak rocks. Elsevier.
[3] Singh, B., Jethwa J., & Dube A. (1992). Correlation between observed support pressure and rock mass quality. Tunnelling and Underground Space Technology.
[4] Goel, R., Jethwa, J., & Paithanakar, A. (n.d), Indian experience with Q and RMR systems, Tunnelling and Underground Space Technology.
[5] Jethwa J., &Singh B. (1984). Estimation of ultimate rock pressure for tunnel linings under squeezing rock conditions- a new approach. Design and Performance of Underground Excavations (pp. 231-8), Cambridge: ISRM.
[6] Sengupta, S. (1998). Influence of geological structures on In Situ Stresses. Uttarakhand, India: Department of Civil Engineering, IIT.
[7] Hoek, E.,& Brown, T. (1980). Underground Excavations in Rock. Institution of Mining and Metallurgy, (p.527). London.
[8] Carranza-Torres C., & Fairhust, C. (2000). Application of Convergence-Confinement method of tunnel design to rock masses that satisfy Hoek-Brown Failure Criterion. Tunnelling and Underground Space Technology.
[9] Grimstad, E., Barton, N. (1980). Updating the Q system for NMT. International Symposium on Sprayed Concrete. Oslo Norway: Norwegian Concret e Association Atkinson, K.E. (2007). Numerical Analysis. Scholarpedia
[10] Zadeh, A., & Tackley, P. (2011). Computational methods for geodynamics. Geophysical Journal International.
[11] Hoek, E., Carranza-Torres, C., & Corkum, B. (2002). Hoek-Brown Failure criterion – 2002 Edition, NARMS-TAC Conference, Toronto.
[12] M.S Rahul (2014). Case study on design and construction of tunnel. International Journal of Engineering Trends andTechnology, 373-380.13(8),
Keywords
Tunnels, Case study, Support, Squeezing, Rock burst, Empirical Method, Analytical Method, Numerical Modelling