Effect of soil set-up on the capacity of jacked concretepipe piles in mixed soils
The increase in capacity of displacement piles with time after installation is typically known as soil/pile set-up. A full-scale field test is carried out to observe the set-up effect for open-ended concrete pipe piles jacked into mixed soils. Both the total capacity and the average unit shaft resis...
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| Published in | 浙江大学学报：A卷英文版 Vol. 12; no. 8; pp. 637 - 644 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
2011
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| Online Access | Get full text |
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| Abstract | The increase in capacity of displacement piles with time after installation is typically known as soil/pile set-up. A full-scale field test is carried out to observe the set-up effect for open-ended concrete pipe piles jacked into mixed soils. Both the total capacity and the average unit shaft resistance increase approximately linearly with logarithmic time. The average increase rate for unit shaft resistance is 44% per log cycle, while the average increase for total capacity is approximately 21%. A review on case histories for long-term set-up indicates an average set-up rate of approximately 40%. Based on this, the mechanism of pile set-up is discussed in detail and a three-phase model is suggested. |
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| AbstractList | The increase in capacity of displacement piles with time after installation is typically known as soil/pile set-up. A full-scale field test is carried out to observe the set-up effect for open-ended concrete pipe piles jacked into mixed soils. Both the total capacity and the average unit shaft resistance increase approximately linearly with logarithmic time. The average increase rate for unit shaft resistance is 44% per log cycle, while the average increase for total capacity is approximately 21%. A review on case histories for long-term set-up indicates an average set-up rate of approximately 40%. Based on this, the mechanism of pile set-up is discussed in detail and a three-phase model is suggested. |
| Author | Jun-wei LIU Zhong-miao ZHANG Feng YU Cun-gang LIN |
| AuthorAffiliation | MOE Key Laboratory of Soft Soil and Geoenvironmental Engineering, Institute of Geoteehnical Engineering, Zhejiang University, Hangzhou 310058, China |
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| Notes | The increase in capacity of displacement piles with time after installation is typically known as soil/pile set-up. A full-scale field test is carried out to observe the set-up effect for open-ended concrete pipe piles jacked into mixed soils. Both the total capacity and the average unit shaft resistance increase approximately linearly with logarithmic time. The average increase rate for unit shaft resistance is 44% per log cycle, while the average increase for total capacity is approximately 21%. A review on case histories for long-term set-up indicates an average set-up rate of approximately 40%. Based on this, the mechanism of pile set-up is discussed in detail and a three-phase model is suggested. Concrete pipe pile, Jack piling, Set-up, Pile capacity 33-1236/O4 Jun-wei LIU, Zhong-miao ZHAN, Feng YU, Cun-gang LIN （ MOE Key Laboratory of Soft Soil and Geoenvironmental Engineering, Institute of Geoteehnical Engineering, Zhejiang University, Hangzhou 310058, China） |
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| Snippet | The increase in capacity of displacement piles with time after installation is typically known as soil/pile set-up. A full-scale field test is carried out to... |
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| Title | Effect of soil set-up on the capacity of jacked concretepipe piles in mixed soils |
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