4.7 Article

Surface settlements induced by twin tunneling in silty sand

期刊

UNDERGROUND SPACE
卷 7, 期 1, 页码 58-75

出版社

KEAI PUBLISHING LTD
DOI: 10.1016/j.undsp.2021.05.002

关键词

Surface settlement; Earth pressure balance shield; Filed measurement; Shield operational parameters

资金

  1. Science and Technology Development Fund, Macau SAR [0057/2020/AGJ, SKL-IOTSC-2021-2023]
  2. National Natural Science Foundation of China [52022001]
  3. University of Macau Research Fund [MYRG2018-00173-FST]
  4. Zhejiang Natu-ral Science Foundation [LHZ20E080001]
  5. Zhejiang Province Key R&D Program Project [2020C01102]
  6. QNLM
  7. HKUST

向作者/读者索取更多资源

This study focuses on the surface settlements caused by twin tunneling in silty sand. A comprehensive field monitoring scheme was conducted to measure the surface settlements, and the influence of different shield operational parameters was explored. The study observed an inverted bimodal shape in the total settlement profiles, which provides important insights for underground space engineering.
Surface settlements caused by twin tunneling are a major interest in underground space engineering. Most prevailing studies have investigated the surface settlements observed over twin tunnels constructed in clay. Yet, less attention is given to the twin tunnels excavated in silty sand, which is the focus of this study. A comprehensive field monitoring scheme was designed in the Hangzhou metro line six project to measure the surface settlements during twin tunneling by adopting earth pressure balance shields. The influence of four shield operational parameters, namely, face pressure, tail grouting pressure, penetration rate, and pitching angle on the surface settlements due to twin tunneling are explored. In general, the total settlement profiles observed over twin tunnels follow an inverted bimodal shape. The post-settlement observed over the 1st tunnel due to the 2nd tunnel excavation is non-trivial when the twin tunnels are spaced closely. Low face pressure and tail grouting pressure can induce excessive peak surface settlements during twin tunneling in silty sand.

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