Volume 23 Issue 4
Aug.  2023
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HUANG Da-wei, XU Chang-jie, LUO Wen-jun, JIANG Hao, LIU Jia-xuan, LI Qing. Design and application of modular step-by-step scale model test for earth pressure balance shield construction[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 248-257. doi: 10.19818/j.cnki.1671-1637.2023.04.018
Citation: HUANG Da-wei, XU Chang-jie, LUO Wen-jun, JIANG Hao, LIU Jia-xuan, LI Qing. Design and application of modular step-by-step scale model test for earth pressure balance shield construction[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 248-257. doi: 10.19818/j.cnki.1671-1637.2023.04.018
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Design and application of modular step-by-step scale model test for earth pressure balance shield construction

doi: 10.19818/j.cnki.1671-1637.2023.04.018

  • State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, Jiangxi, China

Funds:

National Natural Science Foundation of China 52078213

National Natural Science Foundation of China 52238009

National Natural Science Foundation of China U1934208

National Natural Science Foundation of China 52225210

Indepenclent Project of State Key Laboratory of Performance Monitoring and Protecting of Rail Tansit Infrastructure HJGZ2022207

More Information
  • Author Bio:

    HUANG Da-wei(1984-), male, professor, PhD, gddthdw@126.com

    XU Chang-jie(1972-), male, professor, PhD, xucj@zju.edu.cn

  • Received Date: 2023-02-05
  • Publish Date: 2023-08-25
    Abstract
  • To improve the pertinence of experimental research on shield construction-related problems, a modular step-by-step scale model test method for the earth pressure balance shield construction was proposed, and the model test-related device was designed. To avoid the mutual influence of multiple key influencing factors, the key operation links for the shield construction such as the excavation, segment assembly, and synchronous grouting were simulected in a separate and sequential manner. To reduce the cost of experimental research on the cutterhead opening rate, a model shield machine with a geometric similarity ratio of 1∶10 and an adjustable cutterhead opening rate was developed. To ensure the similarity of the longitudinal and transverse stiffnesses of the model shield tunnel, a model shield tunnel with a geometric similarity ratio of 1∶10 and the longitudinal and transverse stiffnesses set on demand respectively was designed. The segment ring adopted the modified homogeneous ring model, and the segment rings were connected by compression spring bolts. To facilitate the test and save the test cost, the model shield tunnel was assembled externally and then put into the steel sleeve, so as to avoid the segment assembly in a narrow space, and the model shield machine did not need to process the segment assembly machine. To realize the precise control of grouting pressure and grouting amount, a constant pressure synchronous grouting device suitable for the indoor model test was designed. The experimental study on the influence of slag soil output control on the surface settlement during the tunneling construction was carried out by using the model shield machine. Analysis results show that the slag soil output per unit tunneling distance is directly related to the over-excavation control in the process of shield tunneling, thus affecting the surface settlement. When the unearthed rate is less than 1, the change in the unearthed rate has little effect on the surface settlement. When the unearthed rate is greater than 1, the increase in the unearthed rate will significantly increase the surface settlement. To maximize the scientific research value of the whole model test, it is suggested to continue to carry out the relevant model test of shield tunnel response research after the completion of shield tunnel construction.

     

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