Journal of Shanghai Jiao Tong University ›› 2021, Vol. 55 ›› Issue (6): 698-706.doi: 10.16183/j.cnki.jsjtu.2020.026

Special Issue: 《上海交通大学学报》2021年“土木建筑工程”专题 《上海交通大学学报》2021年12期专题汇总专辑

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Deformation of a Collinear Tunnel Induced by Overlying Long-Distance Excavation

CHEN Shuan1, WU Huaina1(), CHEN Renpeng1, SHEN Shuilong2, LIU Yuan1   

  1. 1. Department of Civil Engineering, Hunan University, Changsha 410082, China
    2. College of Engineering, Shantou University, Shantou 515063, Guangdong, China
  • Received:2020-01-19 Online:2021-06-28 Published:2021-06-30
  • Contact: WU Huaina


Overlying excavation will inevitably cause uplift of the existing tunnel due to the stress relief and rebound of soil, and the impact will be more significant when the long-distance is in line. Based on the Timoshenko simplified model of tunnel which considers the shearing dislocation between rings, and combining with the Winkler foundation model, an analytical model for soil-tunnel interaction analysis of overlying excavation was established. Based on the superposition principle, the model proposed was applied to a case study of tunnel deformation induced by overlying long-distance collinear excavation. By comparing the calculated results with the measured data, the accuracy of the proposed model was verified. The analysis results show that after the construction of the upper main structure, the uplift deformation of the tunnel has significantly decreased, but the local differential settlement increases, resulting in a significant increase in the internal force of the tunnel and the deformation of the annular joint. The groundwater leakage generally occurrs not at the location with the maximum uplift of tunnel, but between the location with the maximum opening of joint and the location with the maximum shearing dislocation. As a result, not only the total deformation but also the opening and dislocation deformation of joints caused by differential settlement should be concerned in practice. Although the shear deformation generally accounts for about 21.41% of tunnel deformation, the induced shearing dislocation is significant compared with the opening caused by bending, which can be more important for waterproof in joints. The analytic model should not neglect the shearing deformation of the tunnel.

Key words: excavation, tunnel, analytical model, uplift deformation, shearing dislocation

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