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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2011, Vol. 12 Issue (8): 637-644    DOI: 10.1631/jzus.A1000503
Civil and Mechanical Engineering     
Effect of soil set-up on the capacity of jacked concrete pipe piles in mixed soils
Jun-wei Liu, Zhong-miao Zhang, Feng Yu, Cun-gang Lin
MOE Key Laboratory of Soft Soil and Geoenvironmental Engineering, Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
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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.

Key words： Concrete pipe pile      Jack piling      Set-up      Pile capacity     
Received: 12 December 2010      Published: 02 August 2011
CLC:  TU473  
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Jun-wei Liu
Zhong-miao Zhang
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Cun-gang Lin
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Jun-wei Liu, Zhong-miao Zhang, Feng Yu, Cun-gang Lin. Effect of soil set-up on the capacity of jacked concrete pipe piles in mixed soils. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2011, 12(8): 637-644.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1000503     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2011/V12/I8/637

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