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A platform for research: civil engineering, architecture and urbanism
Tunnel Reinforcement in Soft Grounds Using Umbrella Arch Method
The efficient use of underground spaces through constructed tunnels offers a practical solution for the recent increase in the mobility demands. However, in the case of tunneling at shallow depths that the ground consists of weak soils, it deems necessary to deploy reinforcement techniques in order to maintain the stability and safety of the construction process. In this study, the influence of the Umbrella Arch Method (UAM) on controlling the tunneling-induced settlements under severe geotechnical conditions was assessed. To accomplish this objective, the tunnel excavation sequences, as well as the UAM deployment, were simulated through a series of finite element numerical modeling, considering the in-situ conditions associated with a case study. Post-processing of the numerical modeling results indicated that using the UAM resulted in a substantial reduction in the corresponding tunnel crown and ground surface settlements. Additionally, through a parametric analysis, design parameters of UAM pipes, in terms of geometrical and installation- related properties, were evaluated to provide relevant information on the optimized values for each individual parameter. The associated results showed that the optimum value of the pipe length is approximately 1.5 Dtunnel (the equivalent tunnel diameter). Additionally, for the range of design parameters evaluated in this study, the best performance of the UAM was achieved when the pipes diameter, length, installation angle, and installation distance were in the neighborhood of 12 cm, 12 m, 6°, and 30 cm, respectively.
Tunnel Reinforcement in Soft Grounds Using Umbrella Arch Method
The efficient use of underground spaces through constructed tunnels offers a practical solution for the recent increase in the mobility demands. However, in the case of tunneling at shallow depths that the ground consists of weak soils, it deems necessary to deploy reinforcement techniques in order to maintain the stability and safety of the construction process. In this study, the influence of the Umbrella Arch Method (UAM) on controlling the tunneling-induced settlements under severe geotechnical conditions was assessed. To accomplish this objective, the tunnel excavation sequences, as well as the UAM deployment, were simulated through a series of finite element numerical modeling, considering the in-situ conditions associated with a case study. Post-processing of the numerical modeling results indicated that using the UAM resulted in a substantial reduction in the corresponding tunnel crown and ground surface settlements. Additionally, through a parametric analysis, design parameters of UAM pipes, in terms of geometrical and installation- related properties, were evaluated to provide relevant information on the optimized values for each individual parameter. The associated results showed that the optimum value of the pipe length is approximately 1.5 Dtunnel (the equivalent tunnel diameter). Additionally, for the range of design parameters evaluated in this study, the best performance of the UAM was achieved when the pipes diameter, length, installation angle, and installation distance were in the neighborhood of 12 cm, 12 m, 6°, and 30 cm, respectively.
Tunnel Reinforcement in Soft Grounds Using Umbrella Arch Method
Sustain. Civil Infrastruct.
Liu, Yong (editor) / Cuomo, Sabatino (editor) / Yang, Junsheng (editor) / Morovatdar, Ali (author) / Palassi, Massoud (author) / Behnia, Kambiz (author)
Civil Infrastructures Confronting Severe Weathers and Climate Changes Conference ; 2021 ; NanChang, China
2021-07-24
13 pages
Article/Chapter (Book)
Electronic Resource
English
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