CALCULATIONS OF LONGITUDINAL DEFORMATION FOR RIVER-CROSSING SHIELD TUNNELS INDUCED BY SCOUR IN DEEP CHANNEL SECTIONS

LI Xue; WU Jiuqi; GENG Fengjuan; GENG Aopeng; ZHANG Yushen

doi:10.13204/j.gyjzG20112306

Volume 51 Issue 7

Nov. 2021

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LI Xue, WU Jiuqi, GENG Fengjuan, GENG Aopeng, ZHANG Yushen. CALCULATIONS OF LONGITUDINAL DEFORMATION FOR RIVER-CROSSING SHIELD TUNNELS INDUCED BY SCOUR IN DEEP CHANNEL SECTIONS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 6-10,38. doi: 10.13204/j.gyjzG20112306

Citation:

LI Xue, WU Jiuqi, GENG Fengjuan, GENG Aopeng, ZHANG Yushen. CALCULATIONS OF LONGITUDINAL DEFORMATION FOR RIVER-CROSSING SHIELD TUNNELS INDUCED BY SCOUR IN DEEP CHANNEL SECTIONS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 6-10,38. doi: 10.13204/j.gyjzG20112306

Citation:

LI Xue, WU Jiuqi, GENG Fengjuan, GENG Aopeng, ZHANG Yushen. CALCULATIONS OF LONGITUDINAL DEFORMATION FOR RIVER-CROSSING SHIELD TUNNELS INDUCED BY SCOUR IN DEEP CHANNEL SECTIONS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(7): 6-10,38. doi: 10.13204/j.gyjzG20112306

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CALCULATIONS OF LONGITUDINAL DEFORMATION FOR RIVER-CROSSING SHIELD TUNNELS INDUCED BY SCOUR IN DEEP CHANNEL SECTIONS

doi: 10.13204/j.gyjzG20112306

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
2. Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, China

Received Date: 2020-11-23
Available Online: 2021-11-11

Abstract

Abstract

The scour and deposition in deep channel sections of a river bed make the longitudinal loads acting on river-crossing tunnels complicated and affect the longitudinal deformation of tunnels. Based on the river-crossing tunnel project of Nanjing Metro, the longitudinal deformation properties of the shield tunnel caused by different scoured depth and thalweg locations were studied. Firstly, the finite element model was constructed to obtain the longitudinal deformation of the tunnel in different scoured conditions. According to the deformation curve, the curvature radius of the tunnel and the opening widths between joints were calculated. The results showed that:1) The radius of curvature of the tunnel and the maximum opening widths of segment joints were related to the scoured depth and range. The larger the scoured range, the greater the rebound of the tunnel and the smaller the corresponding curvature radius, the larger the opening between segements. 2) The position of the maximum opening width was near the thalweg. 3) In the vicinity of change point for tunnel slopes, the opening widths of segments were obviously larger than that of constant slope sections. Therefore, the locations of changing slope for tunnels should be away from the zones of depth variation for thalwegs in design.
- shield tunnel,
- longitudinal deformation,
- riverbed scour,
- opening width

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References(10)

References

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