Evaluation of new Austrian tunnelling method applied to Bolu tunnel's weak rocks

Aygar, Ebu Bekir

doi:10.1016/j.jrmge.2019.12.011

Cited by 66 publications

(33 citation statements)

References 3 publications

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“…For this reason, Bahçe-Nurdag tunnels have a very high importance in terms of both the travel of local dwellings and the transportation of industrial products. Turkey is located in the Alp-Himalayan earthquake zone, and due to this tectonic feature of Turkey, tunnel construction works have several serious geological and geotechnical problems [7,8]. The Bahçe-Nurdag tunnels are in the active East Anatolian Fault Zone (EAFZ) (Fig.…”

Section: Geological and Geotechnical Conditions Of Tunnel Routementioning

confidence: 99%

Assessment of rate of penetration of a tunnel boring machine in the longest railway tunnel of Turkey

Gökçeoğlu

2021

SN Appl. Sci.

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One of the most important issues in tunnels to be constructed with tunnel boring machines (TBMs) is to predict the excavation time. Excavation time directly affects tunnel costs and feasibility. For this reason, studies on the prediction of TBM performance have always been interesting for tunnel engineers. Therefore, the purpose of the study is to develop models to predict the rate of penetration (ROP) of TBMs. In accordance with the purpose of the study, a new database including 5334 cases is obtained from the longest railway tunnel of Turkey. Each case includes uniaxial compressive strength, Cerchar Abrasivity Index, α angle, weathering degree and water conditions as input or independent variables. Two multiple regression models and two ANN models are developed in the study. The performances of the ANN models are considerably better than those of the multiple regression equations. Before deep tunnel construction in a metamorphic rock medium, the ANN models developed in the study are reliable and can be used. In contrast, the performances of the multiple regression equations are promising, but they predict lower ROP values than the measured ROP values. Consequently, the prediction models for ROP are open to development depending on the new data and new prediction algorithms.

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Section: Geological and Geotechnical Conditions Of Tunnel Routementioning

confidence: 99%

Assessment of rate of penetration of a tunnel boring machine in the longest railway tunnel of Turkey

Gökçeoğlu

2021

SN Appl. Sci.

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“…Allowing the rock to deform slightly (as long as it remains within the admissible safety limits) considerably reduces the loads weighing on the load-bearing system. The rock released under control transfers the load to the sides and thus uses its transport capacity to the maximum by forming a transport chain around the excavation [3][4][5][6][7]. The three-dimensional support at the working face becomes two-dimensional as it moves away from the working face.…”

Section: Introductionmentioning

confidence: 99%

Internal and External Collapse Analysis of Twin-Tubes Tunnel in the Initial Support Stage

KHELALFA¹,

SAKALLI²,

Aygar

et al. 2022

WJCEA

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The characterization of rock mass along the tunnel alignment based on physical, geological and geotechnical data of the project area was used in this work. The support systems were recommended for all geotechnical units using RMR and tunneling quality index (Q-system) support chart. The paper also consists in making a two-dimensional numerical study of the stability of the left lateral slope of the Portal of the tunnel with the Slide 6.0 software and inside provisional support with the Phase.2 2D program. The study shows good results of the internal rock mass stability of the tunnel and satisfactory safety factor (FoS) in terms of collapse analyzes of the lateral slope of the tunnel portals.

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“…Depending on the considerations of various factors such as geological conditions, environmental impacts, construction cost and period, and tunnel dimensions, a tunnel may be excavated using one of the commonly adopted methods including mainly the cut-and-cover method [7,8], drill-and-blast method [9,10], mechanized shield tunnelling method using a tunnel boring machine (TBM) [11,12], new Austrian tunnelling method [13,14], and jacked box tunnelling method [15,16]. Among these methods, the mechanized shield tunnelling method has been widely used for constructing metros in many urban areas in the world [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Ground Deformation Characteristics Induced by Mechanized Shield Twin Tunnelling along Curved Alignments

Guo

et al. 2021

Advances in Civil Engineering

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This paper investigates the ground deformation characteristics induced by mechanized shield twin tunnelling along curved alignments by adopting the nonlinear three-dimensional (3D) finite element method (FEM). The performance of the adopted FEM is demonstrated to be satisfactory by comparing the numerical analysis results with the field monitoring data in a typical case history and with the predicted results generated by a modified version of the Peck’s empirical Gaussian formula. It has been found that the tunnelling-induced transverse ground surface settlement troughs and the distributions of the subsurface horizontal and vertical ground displacements are mostly similar in both form and magnitude for the considered various radii of curvature of tunnel alignment including 50 m, 100 m, 150 m, 200 m, 250 m, 300 m, 400 m, and infinity (i.e., straight-line tunnel). Considering the variational characteristics of the ground deformations with the magnitude of the radius of curvature, the radius of curvature of 100 m can be regarded as a critical tunnel alignment radius of curvature controlling the transformation of the curved tunnelling-induced ground deformational behaviors. For the benefit of geotechnical engineers interested in curved tunnelling with a small radius of curvature, a discussion of the technologies for reducing the overexcavation and improving the accuracy of tunnel lining segment installation is also presented.

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Evaluation of new Austrian tunnelling method applied to Bolu tunnel's weak rocks

Cited by 66 publications

References 3 publications

Assessment of rate of penetration of a tunnel boring machine in the longest railway tunnel of Turkey

Assessment of rate of penetration of a tunnel boring machine in the longest railway tunnel of Turkey

Internal and External Collapse Analysis of Twin-Tubes Tunnel in the Initial Support Stage

Ground Deformation Characteristics Induced by Mechanized Shield Twin Tunnelling along Curved Alignments

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