Three dimensional modelling of spiling bolts for tunnelling in a weakness zone

Trinh, N. Q.; Broch, Einar; Lu, Ming

doi:10.1201/noe0415444019-c53

Cited by 5 publications

(2 citation statements)

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“…Trinh et al [21] suggested the installation methodology of spiles that it may be inserted at a range of angles of 5 o -40 o to the horizontal plane of the longitudinal axis of underground opening excavation and with 30 cm spacing center to center in order to accomplish adequate structural control and appropriate embedment. The standard size of spiles is normally diameter ranges from 25 to 50.8 mm and even 101.6 mm have also been used in large dimension of excavation.…”

Section: A Spilesmentioning

confidence: 99%

Classification and selection methodology for temporary support systems for underground structures

Manoj¹,

Jitendra²,

Naithani³

2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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In this paper a new methodology for evaluation and classification of support system that can be applied to rock tunneling is discussed. It is of great importance to consider long-term stability of rock mass around the openings of underground structure, during design, construction and operation. Varying geological conditions can lead to complications with respect to any underground excavations. The support system may be designed based on empirical, analytical and numerical methods. The support should be installed immediately after the excavation, delayed causes deformation. In this context, many temporary support techniques are chosen to perform as pre-support that can be installed during the first face of excavation around of underground openings. Temporary support used before the excavation for poor rock mass quality to increase the stand-up time by making generally an arch. These supports can also be installed during the excavation and in this paper Arch Method is discussed. Three types of techniques are used in arch method viz. forepoles, grouted arch & spiles. This method is highly recommended and proven system that can be installed within tunnel excavation.

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Section: A Spilesmentioning

confidence: 99%

Classification and selection methodology for temporary support systems for underground structures

Manoj¹,

Jitendra²,

Naithani³

2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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“…There are many engineering examples [5][6] of collapse consolidation at domestic and abroad, but the majority is based on experience. In numerical simulation, the finite element method and the finite difference method based on the traditional continuum mechanics are applicable to predict damages and region [7][8][9][10] . Therefore, the consolidation scheme of the collapse in the shallow buried tunnel was determined using 3D numerical simulation by FLAC 3D software, and then the in-situ monitoring measurements were done during the consolidation construction to evaluate the consolidation effect.…”

Section: Introductionmentioning

confidence: 99%

3D Simulation of Tunnel Collapse Consolidation and <i>In Situ</i> Monitoring Analysis

Chen

Zhao

2011

AMR

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A shallow buried tunnel was collapsed during construction. According to the actual situation of the tunnel, different collapse consolidation schemes were put forward and corresponding three-dimensional finite difference numerical models were established and analyzed using FLAC3D software. Base on the 3D Simulation results, a collapse consolidation scheme was determined and constructed. The in-situ monitoring results of vault subsidence and convergence displacement were consistent approximately with the 3D Simulation results. The in-situ measured results were in line with the specification’s allowance and show that the consolidation effect of reinforced concrete casing arch and ahead grouting method is good. This could be referenced for similar engineering.

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Design of Rock Support in Hard and Layered Rock Masses Using a Hybrid Method: A Study Based on the Construction of the New Skarvberg Tunnel, Norway

Terron-Almenara,

Skretting,

Holter

et al. 2024

Rock Mech Rock Eng

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Hard rock formations with layered, anisotropic geological structures are rather common in Norway. The design of tunnel rock support under such ground conditions has been traditionally done with an empirical approach and assisted with engineering rock mass classification. In most cases, rock stability has been achieved with the use of fiber-reinforced sprayed concrete combined with rock bolts, sometimes supplemented with ribs of reinforced sprayed concrete (RRS) and bolt spiling. However, the discontinuous character and more complex ground behavior of layered rock can lead to design challenges as experienced during the construction of the new Skarvberg highway tunnel in Northern Norway. A significant portion of the tunnel exhibited consistent overbreak, delamination problems and a tunnel failure. In this article, the ground behavior and rock support performance at different locations of the tunnel are investigated to find a basis for design optimization of rock support under similar ground conditions. For this purpose, a thorough site investigation program was carried out, which formed the basis for further assessments and analyses with a hybrid design methodology and the numerical code UDEC (Itasca). As a result, the main challenges of classification systems to capture ground behavior and derive optimal support design in layered rocks were identified. As such, this study has investigated design optimization possibilities, which resulted in the development of, among others, a specific ground behavior classification for layered grounds and a new, optimized RRS-support concept for layered rock masses of very poor quality (e.g., Q ~ 0.1–1).

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Three dimensional modelling of spiling bolts for tunnelling in a weakness zone

Cited by 5 publications

References 0 publications

Classification and selection methodology for temporary support systems for underground structures

Classification and selection methodology for temporary support systems for underground structures

3D Simulation of Tunnel Collapse Consolidation and <i>In Situ</i> Monitoring Analysis

Design of Rock Support in Hard and Layered Rock Masses Using a Hybrid Method: A Study Based on the Construction of the New Skarvberg Tunnel, Norway

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