Conversion coefficient of extremely soft rock by Osterberg Cell Testing of large diameter ultra-long pile

CHEN Yitan; ZHANG Rong; LI Zhongwei

doi:10.20265/j.cnki.issn.1007-2993.2024-0451

Volume 40 Issue 2

Apr. 2026

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CHEN Yitan, ZHANG Rong, LI Zhongwei. Conversion coefficient of extremely soft rock by Osterberg Cell Testing of large diameter ultra-long pile[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(2): 276-286. doi: 10.20265/j.cnki.issn.1007-2993.2024-0451

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CHEN Yitan, ZHANG Rong, LI Zhongwei. Conversion coefficient of extremely soft rock by Osterberg Cell Testing of large diameter ultra-long pile[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(2): 276-286. doi: 10.20265/j.cnki.issn.1007-2993.2024-0451

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Conversion coefficient of extremely soft rock by Osterberg Cell Testing of large diameter ultra-long pile

doi: 10.20265/j.cnki.issn.1007-2993.2024-0451

CHEN Yitan^1
,,
ZHANG Rong²,
LI Zhongwei^{1, 3
,
,}

1.
Nanjing Dongda Self-Balancing Pile Foundation Testing Co., Ltd., Nanjing 211164, Jiangsu, China
2.
Hubei Weixing Construction Co., Ltd., Jingzhou 434300, Hubei, China
3.
School of Civil Engineering, Southeast University, Nanjing 211189, Jiangsu, China

Received Date: 2024-10-03
Accepted Date: 2025-04-09
Rev Recd Date: 2024-12-27

Available Online: 2026-04-09

Publish Date: 2026-04-09

Abstract

Abstract

As an efficient test technique for pile bearing capacity, Osterberg Cell (O-Cell) testing can directly measure the bearing capacity of single pile in complex environment. However, few studies have been conducted on the reasonable value of the key calculation parameter γ in this method under extremely soft rock conditions. Based on the pile foundation of the main tower of Nanjing Longtan Yangtze River Bridge, the in-situ O-Cell testing was carried out and the test results of extremely soft rock stratum were obtained. Considering the weakening effect of the side bearing capacity of the upper section pile, a three-dimensional finite element model is established to simulate the O-Cell testing process, and the conversion coefficient is quantitatively analyzed based on the comparison between the test and the simulated data. The results show that the simulated results are most close to the measured results when the pile foundation conversion coefficient γ is 0.9 in the very soft rock formation. Under extremely soft rock conditions, the modification of the conversion coefficient leads to an increase in both the ultimate bearing capacity and the characteristic bearing capacity of pile foundations, thereby improving the rationality of bearing capacity evaluation and providing a more reasonable basis for capacity selection in engineering design. The research results can provide reference for self-balancing test parameters under similar geological conditions.
- Osterberg Cell Testing,
- bearing capacity of foundation piles,
- extremely soft rock,
- conversion coefficient,
- finite element model

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References(34)

References

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Conversion coefficient of extremely soft rock by Osterberg Cell Testing of large diameter ultra-long pile

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Conversion coefficient of extremely soft rock by Osterberg Cell Testing of large diameter ultra-long pile

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