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Geomechanics and Engineering Volume 30, Number 4, August25 2022 , pages 363-372 DOI: https://doi.org/10.12989/gae.2022.30.4.363 |
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Analytical behavior of longitudinal face dowels based on an innovative interpretation of the ground response curve method |
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Nima Rahimpour, Morteza MohammadAlinejad Omran and Amir Bazrafshan Moghaddam
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Abstract | ||
One of the most frequent issues in tunnel excavation is the collapse of rock blocks and the dropping of rock fragments from the tunnel face. The tunnel face can be reinforced using a number of techniques. One of the most popular and affordable solutions is the use of face longitudinal dowels, which has benefits including high strength, flexibility, and ease of cutting. In order to examine the reinforced face, this work shows the longitudinal deformation profile and ground response curve for a tunnel face. This approach is based on assumptions made during the analysis phase of problem solving. By knowing the tunnel face response and dowel behavior, the interaction of two elements can be solved. The rock element equation derived from the rock bolt method is combined with the dowel differential equation to solve the reinforced ground response curve (GRC). With a straightforward and accurate analytical equation, the new differential equation produces the reinforced displacement of the tunnel face at each stage of excavation. With simple equations and a less involved computational process, this approach offers quick and accurate solutions. The FLAC3D simulation has been compared with the suggested analytical approach. A logical error is apparent from the discrepancies between the two solutions. Each component of the equation | ||
Key Words | ||
analytical method; convergence confinement method; longitudinal dowels; tunnel face; weak rocks | ||
Address | ||
Nima Rahimpour: Faculty of Engineering, University of Tabriz, Tabriz, Iran Morteza MohammadAlinejad Omran, Amir Bazrafshan Moghaddam: Department of Civil Engineering, Shahrood University of Technology, Shahrood, Iran | ||