Dynamic Stability of Soft Soil Between Closely and Obliquely Overlapped Metro Tunnels Subjected to Moving Train Loads

The problem in dynamic stability of soft soil between closely and obliquely overlapped metro tunnels during operation will aggravate cumulative settlements which affects the safety of metro systems. Based on Shenzhen Metro Line 5 and Line 11 overlapped tunnels, a three-dimensional vehicle-track-tunnel-soil model has been established. Meanwhile, the dynamic shear strain and its transfer characteristics of the soft soil layers between overlapped tunnels under moving train loads has been studied. In longitudinal direction, the most unfavorable position for the soft soil is located in the place where the maximum overlapped degree exists between two tunnels. In transverse direction, the dynamic shear strain in soft soil between tunnels diffuses obliquely at a certain angle from the arch waist of tunnel and gradually decreases with the increase of distance. It also increases nonlinearly with the number of operating lines. Besides, the dynamic stability of soft soil was evaluated by the cyclic threshold shear strain parameters of Vucetic and the value exceeds the linear cyclic threshold shear strain. The plastic deformation of soft soil under moving train loads will accumulate obviously and the dynamic stability problem cannot be ignored. Therefore, high-pressure jet grouting pile is adopted to reinforce the soft soil between two tunnels. And the result shows that the dynamic shear strain of soft soil after reinforcement is much smaller than that before.

• Record URL:
  • https://doi.org/10.1007/978-3-030-77238-3
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9783030772376
• Supplemental Notes:
  • © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2022.
• Corporate Authors:

  Springer International Publishing

  ,    
• Authors:
  • Li, Hui
  • Gong, Quanmei
  • Di, Honggui
  • Ye, Weitao
  • Liu, Zhi
• Conference:
  • 4th International Conference on Transportation Geotechnics (4th ICTG)
  • Location: Chicago Illinois, United States
  • Date: 2021-5-23 to 2021-5-26
• Publication Date: 2021-9-17

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 49-62
• Monograph Title: Advances in Transportation Geotechnics IV: Proceedings of the 4th International Conference on Transportation Geotechnics Volume 3
• Serial:
  • Lecture Notes in Civil Engineering
  • Volume: 166
  • Publisher: Springer Singapore
  • ISSN: 2366-2557
  • EISSN: 2366-2565
  • Serial URL: https://www.springer.com/series/15087

Subject/Index Terms

• TRT Terms: Dynamic stability; Live loads; Passenger trains; Shear strain; Soft soils; Tunnels
• Geographic Terms: Shenzhen (China)
• Subject Areas: Bridges and other structures; Geotechnology; Public Transportation; Railroads;

Filing Info

• Accession Number: 01878813
• Record Type: Publication
• ISBN: 9783030772376
• Files: TRIS
• Created Date: Apr 10 2023 11:58AM