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List of products by author: N. Della Valle
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Adoption of shear keys to provide stability to TBM tunnels segmental lining during cross passages construction: The...
Abstract: Within the 10m diameter, 3.5km long Aked tunnel project, part of the Jerusalem-Tel Aviv Rapid Railway, construction of 14 cross passages between the tubes is being executed. Each one implies partially demolishing two rings, on each tube. To transfer the axial forces acting on the opened rings to the adjacent ones and thus provide stability to the lining, reinforced concrete keys installed on...
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Detailed TBM Boring Cycle Estimation Using Rock Mass Rating System
Abstract: Due to growing importance of Tunnel Boring Machine (TBM) excavation method in tunnelling, tunnel designers require reliable and up-to-date performance prediction models. Most common models consider advance rate as a function of geology and machine parameters. Authors propose an innovative approach: mechanized tunnelling is an industrial process, so whole boring cycle has a substantial impact on...
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Feasibility Study on the Applicability of a TBM for the Excavation of the 10km Long Diquís Hydroelectric Project...
Abstract: The Diquís Hydroelectric Project is foreseen to have an installed power capacity of 631MW and is located in the southwest of Costa Rica in the General and Térraba rivers basins. The project’s headrace tunnel, which is due to transfer water from the upstream reservoir on the General river down to the underground powerhouse, in the vicinity of the Térraba river, is about 10.5km long and will...
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Prediction of Induced Settlements by Conventional Tunneling in Urban Area
Abstract: This paper aims to share the lessons learned from the conventional excavation induced settlements in the Metro project of Üsküdar – Ümraniye – Çekmeköy (UUC) in Istanbul. The ongoing UUC project intended to extend the metro network at Istanbul Asian side. Starting from the recently opened Marmaray railway link in Üsküdar, the metro stretch runs 17 km underneath a high dense urban area, whereof...
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Twin tunnels and asymmetrical settlement troughs in soft soils
Abstract: Numerous designs in twin tunnel projects assume the superposition of two Gaussian settlement curves as a method to evaluate the overall settlement induced by their excavation. In this paper we verify a quick method for settlement trough fitting and volume loss estimation for the second tunnel of a twin tunnel project, based on Peck’s formulation and using the data obtained in the first...
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Twin Tunnels Critical Underpass during Sofia Metro Line 3 Extension
Abstract: Project Extension of Sofia metro, Line 3, phase I, aims to build almost 8 km of a metro single tube excavated by a 9.4 m EPB Machine and seven new stations. TBM drive challenged the underpass of two existing 5.2 m internal diameter tunnels with tight overburden of only 1.4 m; few meters prior TBM breakthrough into Metro Station 8, which increased the complexity of the operations. Ground...
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