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Volume 47 Issue 7
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CHENG Xinjun, XU Kunpeng, JING Liping, CUI Jie, LI Yadong, LIANG Hai'an. Response mechanism of soil-immersed tunnel based on static pushover model tests[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(7): 1443-1453. DOI: 10.11779/CJGE20240022
Citation: CHENG Xinjun, XU Kunpeng, JING Liping, CUI Jie, LI Yadong, LIANG Hai'an. Response mechanism of soil-immersed tunnel based on static pushover model tests[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(7): 1443-1453. DOI: 10.11779/CJGE20240022
shu

Response mechanism of soil-immersed tunnel based on static pushover model tests

  • 1.

    Architecture and Civil Engineering Institute, Guangdong University of Petrochemical Technology, Maoming, 525000, China

  • 2.

    School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China

  • 3.

    Institute of Engineering Mechanics, China Earthquake Administration, Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin 150080, China

  • 4.

    School of Civil Engineering, Guangzhou University, Guangzhou 510006, China

Funds: 

the Natural Science Foundation of China 52008081

the Natural Science Foundation of China 52020105002

the Natural Science Foundation of China 52168045

the Natural Science Foundation of China 52178392

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  • Received Date: January 07, 2024
  • Revised Date: December 13, 2024
  • Accepted Date: January 30, 2025
  • Available Online: December 23, 2024
  • Published Date: January 31, 2025
    Graphical Abstract
    • Abstract
  • The static pushover tests on the underground structures mainly concentrate on consistent deformation of soils, with scarcely any studies considering soil dislocation. A regional pushover method is proposed. The static pushover model tests on soil-immersed tunnel are conducted. The deformation and mechanical features of soils and immersed tunnel are carefully analyzed. The failure mode of the immersion joint and the soil-immersed tunnel interaction mechanism are revealed. The test results show that the immersed tunnel exhibits strong adaptability to soil deformation owning to the flexible joint. With the increase of soil dislocation, the earth pressure difference at the same depth of two tunnel elements near and away from the pushover plate can reach up to 71.6 kPa, and obvious relative displacement occurs between two tunnel elements. Structural failure phenomenon is mainly concentrated at the shear key of the tunnel element near the pushover plate, and the story shifts of the two tunnel elements near and away from the pushover plate are 1/223 and 1/1024, respectively. The soil-immersed tunnel interaction can be divided into three stages: soil compacting stage, rapid development of differential deformation stage, and joint failure stage. The stiffness of the tunnel element maintains well, and the soil-structure interaction coefficients obtained from the two observation surfaces develop slowly during the soil compacting stage. Obvious relative displacement occurs between two tunnel elements during the rapid development stage of soil dislocation. Meanwhile, the soil-structure interaction coefficient near the pushover plate exceeds 1. Furthermore, the soil-structure interaction coefficient away from the pushover plate still develops slowly. The soil-structure interaction coefficients near and away from the pushover plate are 3.10 and 0.67, respectively, during the joint failure stage. The study can provide experimental and technical support for the seismic analysis and risk assessment of immersed tunnels.
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