ISSN 2096-4498

   CN 44-1745/U

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Tunnel Construction >

2024 , Vol. 44 >Issue 8: 1567 - 1575

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.08.004

Experimental Modeling of Sand Settlement and Pipeline Void Formation Caused by Shield Tunneling

  • QI Jun ,
  • WANG Zhongjie ,
  • CHEN Zijun ,
  • LIN Cungang ,
  • XIE Wenjiang ,
  • LIANG Yu ,
  • ZHAO Mingjie ,
  • ZHAO Chenyang
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  • (1. Guangdong Zhuzhao Railway Co., Ltd., Guangzhou 510000, Guangdong, China; 2. Guangdong Key Laboratory of Marine Civil Engineering, Guangdong Research Center for Underground Space Exploitation Technology, School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China; 3. State Key Laboratory for Tunnel Engineering, Guangzhou 510275, Guangdong, China; 4. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, Guangdong, China)

Online published: 2024-09-12

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Abstract

To systematically investigate the interaction between soil and pipeline caused by shield tunneling and to elucidate the complexities of ground displacement and the changing state of pipe-soil interface contact, a scaled physical model test is employed. This model pipeline is designed to monitor pipeline settlement, pipe void formation, and subsoil pressure. Furthermore, shield tunneling process is simulated through tube extraction, followed by sequential tests on deep soil settling, pipeline response, and pipe soil voiding. The experimental results reveal the following: (1) Deep soil settlement caused by shield tunneling conforms to a Gaussian distribution, with the width of the settlement and volume loss exhibiting nonlinear changes with soil depth. (2) The tests confirm that significant volume loss leads to the formation of voids. The maximum deflection of the pipeline and the void height increase with burial depth, while the void width decreases. (3) During tunneling, voids begin to form at the pipeline bottom when the excavation face is approximately 1.5 times the tunnel diameter away. The primary development of voids occurs within one tunnel diameter from the pipeline.

Key words： shield tunnel; pipeline deformation; void; pipe-soil interaction; model test

Cite this article

QI Jun , WANG Zhongjie , CHEN Zijun , LIN Cungang , XIE Wenjiang , LIANG Yu , ZHAO Mingjie , ZHAO Chenyang . Experimental Modeling of Sand Settlement and Pipeline Void Formation Caused by Shield Tunneling[J]. Tunnel Construction, 2024 , 44(8) : 1567 -1575 . DOI: 10.3973/j.issn.2096-4498.2024.08.004

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