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| Adjacent Tunnels and Tunnel Protection |
| ZHANG Hongbing,FAN Fan,HU Hao
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| (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University,
Shanghai 200240, China) |
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Abstract bstract： The influence of different distribution types of excavation adjacent to tunnels was studied systematically by classification and induction of the distribution types of excavation. The action mechanism of the effects was revealed and the corresponding protective measures was proposed to provide the theoretical support for the excavation construction and protection of the adjacent tunnels. According to the position relationship between the excavation and the adjacent tunnels, the excavation can be divided into two groups, onesideexcavation and twosideexcavation. According to the excavation depth and the sharing of retaining structure, the excavation can be divided into nearexcavation, closeexcavation and excavationinexcavation. The influence of excavation on the adjacent tunnels can be summarized as spacetime effect, earth pressure multiple unloading, soil deformation superposition effect, groundwater influence and so on. To control the influence of excavation on adjacent tunnels, some measures can be taken such as reasonable partition, reasonable arrangement of construction sequence, adjustment of structural stiffness and reinforcement. Finally, the project of Longhua Aviation Center in Shanghai was analyzed in detail by using the numerical analysis method and field monitoring method which can provide reference for other projects of excavation group construction and tunnel protection.
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Published: 28 May 2016
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