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A platform for research: civil engineering, architecture and urbanism
Study on Selection of Excavation Methods and Spacing Distance for Ultra-shallow-Buried and River-Crossing Tunnel with Small Clearance
For the mined land section of the river-crossing tunnel with small clearance, the study should be carried out for excavation method and safe spacing before the tunnel construction, for engineering properties of surrounding rock is poor and the distance between two tunnel tubes is small. In this paper, in combination with the mined land section works of the river-crossing tunnel on Rongjiang Fourth Road, the finite difference numerical simulation software was adopted to calculate mechanical behaviors of three construction methods: three-bench method, CD method and CRD method under different excavation spacing (10 m, 20 m, 30 m and 40 m) on the basis of grouting and pre-reinforcement of surrounding rock in the early stage. The calculation results indicate that vault displacement and ground settlement can notmeet the specification requirements when the three-bench method is adopted for construction, even if the excavation spacing between the former and latter tunnels is 40m; When the CD method is adopted for construction, vault displacement and ground settlement meet the specification requirements when the excavation spacing between the former and latter tunnels is 40m; When the CRD method is adopted for construction, vault displacement and ground settlement meet the specification requirements when the excavation spacing between the former and latter tunnels is 30m; The control effect of initial support deformation and surrounding rock displacement is in the following sequence: CRD method > CD method > three-bench method. Considering various factors, it is found that the CD method is more reasonable and efficient. Therefore, the CD method is recommended for tunnel excavation and the tunnelling spacing should be controlled to 40m.
Study on Selection of Excavation Methods and Spacing Distance for Ultra-shallow-Buried and River-Crossing Tunnel with Small Clearance
For the mined land section of the river-crossing tunnel with small clearance, the study should be carried out for excavation method and safe spacing before the tunnel construction, for engineering properties of surrounding rock is poor and the distance between two tunnel tubes is small. In this paper, in combination with the mined land section works of the river-crossing tunnel on Rongjiang Fourth Road, the finite difference numerical simulation software was adopted to calculate mechanical behaviors of three construction methods: three-bench method, CD method and CRD method under different excavation spacing (10 m, 20 m, 30 m and 40 m) on the basis of grouting and pre-reinforcement of surrounding rock in the early stage. The calculation results indicate that vault displacement and ground settlement can notmeet the specification requirements when the three-bench method is adopted for construction, even if the excavation spacing between the former and latter tunnels is 40m; When the CD method is adopted for construction, vault displacement and ground settlement meet the specification requirements when the excavation spacing between the former and latter tunnels is 40m; When the CRD method is adopted for construction, vault displacement and ground settlement meet the specification requirements when the excavation spacing between the former and latter tunnels is 30m; The control effect of initial support deformation and surrounding rock displacement is in the following sequence: CRD method > CD method > three-bench method. Considering various factors, it is found that the CD method is more reasonable and efficient. Therefore, the CD method is recommended for tunnel excavation and the tunnelling spacing should be controlled to 40m.
Study on Selection of Excavation Methods and Spacing Distance for Ultra-shallow-Buried and River-Crossing Tunnel with Small Clearance
Lecture Notes in Civil Engineering
Feng, Guangliang (editor) / Gong, Zhiqun (author) / Guo, Hongyu (author) / Fu, Helin (author) / Zhao, Yibo (author) / Peng, Zetong (author)
International Conference on Civil Engineering ; 2023 ; Nanchang, China
Proceedings of the 10th International Conference on Civil Engineering ; Chapter: 25 ; 261-272
2024-07-20
12 pages
Article/Chapter (Book)
Electronic Resource
English
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