Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (4): 1165-1178.doi: 10.16285/j.rsm.2022.0696

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of ground settlement induced by small radius curve tunnel excavation considering shield articulation effect

ZHANG Zhi-guo1, 2, 3, 4, CHEN Jie1, ZHU Zheng-guo2, WEI Gang4, WU Zhong-teng3, CHEN Zhong-kan1   

  1. 1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; 3. Key Laboratory of Geohazard of Fujian Province, Key Laboratory of Geohazard Prevention of Hilly Mountains of Ministry of Natural Resources of China, Fuzhou, Fujian 350002, China; 4. Department of Civil Engineering, Zhejiang University City College, Hangzhou, Zhejiang 310015, China
  • Received:2022-05-11 Accepted:2022-07-19 Online:2023-04-18 Published:2023-04-29
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41977247, 42177145), the Project of Key Laboratory of Geohazard Prevention of Hilly Mountains of Ministry of Natural Resources of China (Key Laboratory of Geohazard Prevention of Fujian Province) (FJKLGH2020K004) and the Project of the State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures (KF2022-07).

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Abstract: Current theoretical studies of ground settlement induced by small radius curved tunnelling mostly consider the shield as a continuous whole and do not consider the effect of shield articulation. Therefore, the over-excavation gap caused by the change of excavation path of small curvature shield cannot be correctly evaluated. Firstly, based on the shield articulation position and the geometric position relationship between the shield and the small curvature tunnel excavation path, the calculation formulas were obtained for the over-excavation gap and articulated angle at different articulation positions of the shield machine during the excavation of the small curvature tunnel. Then, the mirror image method and Mindlin solution were used to solve the ground settlement caused by the combined effect of over-excavation ground loss, shield tail ground loss, excavation face uneven thrust, shield shell uneven friction and slurry pressure at the shield tail during articulated shield. Finally, engineering monitoring data were used to compare and verify with the theoretical solution of this paper, and good agreement was obtained. In addition, parametric analysis was carried out for the tunnel turning radius, front shield length, shield articulation angle and over-excavation gap. The analysis results show that ignoring the effect of shield articulation will overestimate the ground loss and result in large predictions of ground settlement. As the turning radius decreases, length of the front shield, shield articulation angle and over-excavation gap increases, the ground settlement increases, but the change of its value has a small effect on the settlement in front of the excavation face and a larger effect on the settlement behind the excavation face. Behind the excavation face, the longitudinal surface settlement tends to increase and then decrease as the distance from the excavation face increases, when the turning radius is taken to be small and the front shield length, shield articulation angle and over-excavation gap are taken to be large.

Key words: shield articulation, small radius curve tunnel, articulated angle, over-excavated gap, ground settlement, Mindlin solution

CLC Number: 

  • TU457
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