Analysis of support requirements for a shallow diversion tunnel at Guledar dam site, Turkey

Başarır, Hakan; Özsan, Aydın; Karakus, Murat

doi:10.1016/j.enggeo.2005.07.010

Cited by 44 publications

(19 citation statements)

References 11 publications

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“…Because the support technology improves with time, tunnel designers use different supports for various tunnel spans using the RMR 89 tunnel support guidelines [37][38][39]. Design engineers predict supports for tunnel stability other than for those with a 10-m span, and the design process involves personal judgment.…”

Section: Characterization and Classification Of Rock Mass Based On Rmmentioning

confidence: 99%

Empirical Evaluation of Rock Mass Rating and Tunneling Quality Index System for Tunnel Support Design

et al. 2018

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Abstract:The primary output of the rock mass rating (RMR) and tunneling quality index (Q) system is a preliminary tunnel support design, as these methods are empirically developed and updated for this purpose. In this study, these internationally accepted design tools are evaluated to improve results for tunnel support design. The rating system is simplified and improved for some parameters through the use of equations to replace the discrete/lump characterization with a continuous rating. Recent developments in characterization and support are used in proposing the back analysis approach of rock mass quality calculation from tunnel span and installed support. This approach is used for two tunnel projects which experience high stresses. Approximately 90% of the tunnel sections show that actual supports have rock bolt spacing and shotcrete thickness which are heavier than those indicated by RMR 89 , indicating a system limitation. Another assessment using RMR 14 indicates that its rating is higher than that of RMR 89 . A strong correlation exists between them, as supported by the literature and data from analyses of 462 tunnel sections. Despite its new version, RMR 89 still preserves its importance. Evaluating the different correlations between RMR and Q through published data indicates that the rock mass fabric index gives comparatively better results.

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Section: Characterization and Classification Of Rock Mass Based On Rmmentioning

confidence: 99%

Empirical Evaluation of Rock Mass Rating and Tunneling Quality Index System for Tunnel Support Design

et al. 2018

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“…In 1989, the support chart remained unchanged and refinement of the system was made in characterization. Support technology upgraded for tunnels with time and thus, the designers used support for different tunnel spans [76][77][78]. The foremost update in support using RMR system was accomplished, after twenty four years of experience, in which the tunnel support is a function of the tunnel size and rock-mass score [46].…”

Section: Rmr Systemmentioning

confidence: 99%

Review of Rock-Mass Rating and Tunneling Quality Index Systems for Tunnel Design: Development, Refinement, Application and Limitation

et al. 2018

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Although rock-mass rating (RMR) and tunneling quality index (Q) systems are used in different rock engineering projects as empirical design tools, their application in tunnel design is widely accepted as these systems were developed and updated for this purpose specifically. This paper reviews the work conducted by various researchers since the development of these two systems with respect to tunneling only. Compared to other empirical classification systems, these systems received international acceptance and are still used as empirical design tools in tunneling due to their continuous updates in the form of characterization and support. As the primary output of these systems is the initial support design for tunnel, however, their use in the calculation for rock-mass properties is an essential contribution of these systems in rock engineering design. Essential for the tunnel design, these rock-mass properties include the modulus of deformation, strength, Poisson's ratio, Mohr-Coulomb parameters and Hoek-Brown constants. Other application for tunneling include the stand-up time and rock load. The uses and limitations of these systems as empirical tunnel design tools are also included in this review article for better results. Research to date indicates that if the ground behavior is also taken into account, the application of these empirical systems will be more beneficial to the preliminary design of tunnels.

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“…These classification methods are the results of researches in many tunnel cases, and have been applied in many evaluations about the stability of practical tunnel surrounding rock mass. But these methods could not quantitatively compute the stress redistribution aroused in tunnelling works (Basarir et al, 2005), and could not reasonably consider the local stability of unequal tunnel surrounding rocks with weak rock layer. On the other hand, the finite element method could offer the displacement of the surrounding rock mass after tunnel is excavated, the stress redistribution, the plastic zone distribution, and other useful information, which can help to quantitatively evaluate the stability of the surrounding rock mass (Zhu Weishen et al, 2003& Basarir et al, 2005.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Stability of Tunnel Surrounding Rock with Weak Rock Layer

Zhang

2009

MAS

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The evaluation of local stability of the tunnel surrounding rock mass with weak rock layer is very important for the economy and security of the tunnel construction. Based on the rock tunnel geological conditions in the construction, the finite element model of the tunnel surrounding rock mass stability analysis with weak rock layer is established in the article by selecting the ABAQUS program linear D-P materials model as the gneiss yield criterion. The computation result indicates that the explicit dynamic analysis program could simulate the whole process of the instabilization and failure of the weak rock layer, and avoid the convergence existing in the general finite element computation, and the analysis model and program could offer effective measure for the analysis of local stability of the tunnel surrounding rock mass with weak rock layer.

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Analysis of support requirements for a shallow diversion tunnel at Guledar dam site, Turkey

Cited by 44 publications

References 11 publications

Empirical Evaluation of Rock Mass Rating and Tunneling Quality Index System for Tunnel Support Design

Empirical Evaluation of Rock Mass Rating and Tunneling Quality Index System for Tunnel Support Design

Review of Rock-Mass Rating and Tunneling Quality Index Systems for Tunnel Design: Development, Refinement, Application and Limitation

Finite Element Analysis of the Stability of Tunnel Surrounding Rock with Weak Rock Layer

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