Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Three-dimensional analysis of excavation face stability of shallow tunnels
Highlights Face stability analysis of shallow tunnels by analytical and numerical methods. Tunnel structure becomes self-supporting for very high soil cohesion values. A 15-cm thick shotcrete was required to determine limit support pressure values. At higher tunnel depth, more pressure needed to support excavation face.
Abstract Several studies have been focused on minimizing construction risks of underground works. However, additional studies regarding excavation face stability, which has great influence on global performance of shallow tunnels, will offer more security criteria to engineers. The aim of this work is to compare the results from an existing analytical and a numerical method in assessing the behavior of the excavation face subjected to different overburden depth and ground conditions. Typical parameters of shallow soils were considered for all simulations. The analytical method was applied to assess the excavation face pressure for different tunnel covers. Numerical methods were applied using ABAQUS 3D® finite elements software, which considered a continuous, homogeneous medium in a 6-meter-wide tunnel excavated at different depths, and assessed the need for support and stabilization pressure on the face. Furthermore, the influence of a well on the excavation line was also considered for such assessment. As result, excavation face was defined as stable by the analytical method; nevertheless, it was obtained a very low safety factor. On the other hand, results from the numerical method showed the need to apply pressure on the excavation face. Those limit support pressure values at tunnel face showed a direct correlation with the increase of cover-to-tunnel diameter ratio. Finally, the numerical method showed a more realistic result when compared with the analytical method.
Three-dimensional analysis of excavation face stability of shallow tunnels
Highlights Face stability analysis of shallow tunnels by analytical and numerical methods. Tunnel structure becomes self-supporting for very high soil cohesion values. A 15-cm thick shotcrete was required to determine limit support pressure values. At higher tunnel depth, more pressure needed to support excavation face.
Abstract Several studies have been focused on minimizing construction risks of underground works. However, additional studies regarding excavation face stability, which has great influence on global performance of shallow tunnels, will offer more security criteria to engineers. The aim of this work is to compare the results from an existing analytical and a numerical method in assessing the behavior of the excavation face subjected to different overburden depth and ground conditions. Typical parameters of shallow soils were considered for all simulations. The analytical method was applied to assess the excavation face pressure for different tunnel covers. Numerical methods were applied using ABAQUS 3D® finite elements software, which considered a continuous, homogeneous medium in a 6-meter-wide tunnel excavated at different depths, and assessed the need for support and stabilization pressure on the face. Furthermore, the influence of a well on the excavation line was also considered for such assessment. As result, excavation face was defined as stable by the analytical method; nevertheless, it was obtained a very low safety factor. On the other hand, results from the numerical method showed the need to apply pressure on the excavation face. Those limit support pressure values at tunnel face showed a direct correlation with the increase of cover-to-tunnel diameter ratio. Finally, the numerical method showed a more realistic result when compared with the analytical method.
Three-dimensional analysis of excavation face stability of shallow tunnels
Zamora Hernández, Yasletty (Autor:in) / Durand Farfán, Aldo (Autor:in) / Pacheco de Assis, André (Autor:in)
23.07.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Three-Dimensional Face Stability Analysis of Shallow Circular Tunnels
| British Library Conference Proceedings | 2000
| DOAJ | 2025
Stabilisation of the Excavation Face in Shallow Tunnels Using Fibreglass Dowels
| British Library Online Contents | 2012
Stabilisation of the Excavation Face in Shallow Tunnels Using Fibreglass Dowels
| Online Contents | 2012