Effects of different empirical tunnel design approaches on rock mass behaviour during tunnel widening
| Autor: | Kamran Akhtar, Babar Khan, S. Muhammad Jamil, Turab H. Jafri |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Finite difference method (FDM) Construction engineering Tunnel widening Mining engineering Numerical simulation Article 03 medical and health sciences 0302 clinical medicine Rock mass rating Geotechnical engineering Civil engineering Geological Strength Index lcsh:Social sciences (General) lcsh:Science (General) Rock mass classification Multidisciplinary Computer simulation Longitudinal deformation profile (LDP) FLAC 3D Excavation New Austrian Tunnelling method Empirical design Empirical tunnel design methods 030104 developmental biology lcsh:H1-99 Support system 030217 neurology & neurosurgery Geology lcsh:Q1-390 |
| Zdroj: | Heliyon, Vol 5, Iss 12, Pp e02944-(2019) Heliyon |
| ISSN: | 2405-8440 |
| DOI: | 10.1016/j.heliyon.2019.e02944 |
| Popis: | Empirical based approaches play an important role in tunnel excavation and support system design. These approaches are considered to be very effective in optimising the process of tunnel excavation and particularly tunnel widening. Several reliable empirical approaches have been developed, however the selection or utilisation of an appropriate empirical method for designing the widening of a tunnel is still a challenging task. Therefore, in this work, the analysis of seven different empirical design approaches was carried out to determine the rock mass behaviour during tunnel widening in high in-situ stress state. These approaches include New Austrian Tunnelling Method, Rock Mass Rating, Rock Mass Quality, Rock Mass Index, Rock Structure Rating, Geological Strength Index and Basic Quality Index. On the basis of simulated statistical results obtained from the said empirical approaches, it was found that the application of Rock Mass Quality approach is highly effective in the tunnel widening since it can satisfactorily incorporate the equivalent dimensions and in-situ stress condition of widened tunnel. The method furnishes optimised reinforcement and support design. Additionally, this study also produces reliable data related to the initial excavation of tunnel which can be helpful in defining precise rock mass parameters during tunnel widening. Civil engineering; Geotechnical engineering; Mining engineering; Construction engineering; Finite difference method (FDM); Tunnel widening; Longitudinal deformation profile (LDP); Empirical tunnel design methods.; FLAC 3D; Numerical simulation |
| Databáze: | OpenAIRE |
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