Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Deformation Mechanism and Controlling Strategies of Leading Tunnel Induced by Close-Spaced Lagging EPBS Driving
https://orcid.org/http://orcid.org/0000-0003-1587-4117
The motivation of this paper is to propose a new construction method with better control effects and economic advantages to overcome the disturbance problem in constructing small-spaced twin tunnels under narrow site conditions. First, the reinforcement measures commonly used in some typical projects in recent years and their disadvantages are summarized. Next, combined with the construction case of a double-line shield tunnel with a distance of 0.69 m from the Tel Aviv subway in Israel, a construction scheme for building an underground diaphragm wall between the two tunnels is proposed. Furthermore, the deformation and internal force change characteristics of the leading tunnel segment during the lagging shield tunneling are studied, and the interaction mechanism between small-spaced tunnels is explained. Computational results indicate that when the clearing distance between the tunnels increased from 0.096 to 0.7D, the range of segments affected by the subsequently excavated tunnel was reduced by 52%, and segments bending moment and axial force were decreased by 36% and 71%, respectively. When the tunnel depth is not greater than 2.0D, the minimum tunnel spacing should be not less than 0.28D. The required safe tunnel spacing will increase if the tunnel depth increases. Both recorded and simulated data show that an underground diaphragm wall between the tunnels can protect the leading tunnel effectively. The underground diaphragm wall was recommended for similar projects, enabling construction before shield tunneling with no need to reinforce the tunnel interior.
Deformation Mechanism and Controlling Strategies of Leading Tunnel Induced by Close-Spaced Lagging EPBS Driving
https://orcid.org/http://orcid.org/0000-0003-1587-4117
The motivation of this paper is to propose a new construction method with better control effects and economic advantages to overcome the disturbance problem in constructing small-spaced twin tunnels under narrow site conditions. First, the reinforcement measures commonly used in some typical projects in recent years and their disadvantages are summarized. Next, combined with the construction case of a double-line shield tunnel with a distance of 0.69 m from the Tel Aviv subway in Israel, a construction scheme for building an underground diaphragm wall between the two tunnels is proposed. Furthermore, the deformation and internal force change characteristics of the leading tunnel segment during the lagging shield tunneling are studied, and the interaction mechanism between small-spaced tunnels is explained. Computational results indicate that when the clearing distance between the tunnels increased from 0.096 to 0.7D, the range of segments affected by the subsequently excavated tunnel was reduced by 52%, and segments bending moment and axial force were decreased by 36% and 71%, respectively. When the tunnel depth is not greater than 2.0D, the minimum tunnel spacing should be not less than 0.28D. The required safe tunnel spacing will increase if the tunnel depth increases. Both recorded and simulated data show that an underground diaphragm wall between the tunnels can protect the leading tunnel effectively. The underground diaphragm wall was recommended for similar projects, enabling construction before shield tunneling with no need to reinforce the tunnel interior.
Deformation Mechanism and Controlling Strategies of Leading Tunnel Induced by Close-Spaced Lagging EPBS Driving
https://orcid.org/http://orcid.org/0000-0003-1587-4117
The motivation of this paper is to propose a new construction method with better control effects and economic advantages to overcome the disturbance problem in constructing small-spaced twin tunnels under narrow site conditions. First, the reinforcement measures commonly used in some typical projects in recent years and their disadvantages are summarized. Next, combined with the construction case of a double-line shield tunnel with a distance of 0.69 m from the Tel Aviv subway in Israel, a construction scheme for building an underground diaphragm wall between the two tunnels is proposed. Furthermore, the deformation and internal force change characteristics of the leading tunnel segment during the lagging shield tunneling are studied, and the interaction mechanism between small-spaced tunnels is explained. Computational results indicate that when the clearing distance between the tunnels increased from 0.096 to 0.7D, the range of segments affected by the subsequently excavated tunnel was reduced by 52%, and segments bending moment and axial force were decreased by 36% and 71%, respectively. When the tunnel depth is not greater than 2.0D, the minimum tunnel spacing should be not less than 0.28D. The required safe tunnel spacing will increase if the tunnel depth increases. Both recorded and simulated data show that an underground diaphragm wall between the tunnels can protect the leading tunnel effectively. The underground diaphragm wall was recommended for similar projects, enabling construction before shield tunneling with no need to reinforce the tunnel interior.
Deformation Mechanism and Controlling Strategies of Leading Tunnel Induced by Close-Spaced Lagging EPBS Driving
Int J Civ Eng
Yang, Zhiyong (Autor:in) / Shao, Xiaokang (Autor:in) / Qi, Weiqiang (Autor:in) / Jiang, Yusheng (Autor:in) / Yang, Xing (Autor:in)
International Journal of Civil Engineering ; 21 ; 1783-1799
01.11.2023
17 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2015
| British Library Online Contents | 2018
Study on Soil Improvement Technology of EPBS Tunnel
| Trans Tech Publications | 2011
Influence of Tunnel Blasting on the Close-Spaced Tunnel
| British Library Conference Proceedings | 2011