Settlement calculation method for sand compaction piles under water based on in-situ measurement

KOU Xiao-qiang; YU Jian; XU Xin-wei; SONG Shen-you; GAO Chao

doi:10.11779/CJGE202205004

Volume 44 Issue 5

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Chinese Journal of Geotechnical Engineering > 2022 > 44(5): 820-826. > DOI: 10.11779/CJGE202205004

KOU Xiao-qiang, YU Jian, XU Xin-wei, SONG Shen-you, GAO Chao. Settlement calculation method for sand compaction piles under water based on in-situ measurement[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(5): 820-826. DOI: 10.11779/CJGE202205004

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Settlement calculation method for sand compaction piles under water based on in-situ measurement

KOU Xiao-qiang^{1, 2, 3,},
YU Jian^{1, 2, 3},
XU Xin-wei^{1, 2, 3},
SONG Shen-you⁴,
GAO Chao^{1, 2, 3}

1.
CCCC Tianjin Port Engineering Institute, Ltd., Tianjin 300222, China
2.
Key Laboratory of Port Geotechnical Engineering, Ministry of Transport, PRC, Tianjin 300222, China
3.
Key Laboratory of Geotechnical Engineering of Tianjin, Tianjin 300222, China
4.
Guangdong Highway Construction Co., Ltd., Zhongshan 528400, China

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Received Date: January 04, 2021
Available Online: September 22, 2022

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Abstract

Abstract

The sand compaction pile which is an efficient foundation treatment method under water is used in Hongkong-Zhuhai-Macao Bridge and Shenzhen-Zhongshan Link. A large number of in-situ tests such as underwater plate load tests and surcharge preloading tests under water are implemented. The in-situ values of pile-soil stress ratio in the underwater plate load tests are discussed, and the values of pile-soil stress ratio are kept to 6 in the process of loading. The settlement of the sand compaction pile ground in the process of surcharge preloading under water is monitored, and the values of settlement are comparatively analyzed to those by the available calculation method recommended in the Japanese standard. It is illustrated that the available calculation method in the Japanese standard is conservative when the replacement rate is less than 50%, and is not suitable for the practice when the replacement rate is more than or equal to 50%. A modified settlement calculation method based on the in-situ measurement is proposed and illustrated, and the values of pile-soil stress ratio are suggested in the range of 5 to 6.3.
- sand compaction pile,
- settlement calculation method,
- pile-soil stress ratio,
- in-situ measurement,
- reduction factor of settlement

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References (15)

References

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