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STUDY OF PREMATURE REFUSAL OF LARGE DIAMETER PIPE PILE CAUSED BY PILE DRIVING SUSPENDING |
| LI Sa1，HUANG Jianchuan1，ZHOU Yangrui2，JIANG Baofan2 |
(1. School of Civil Engineering，Tianjin University，Tianjin 300072，China；
2. China Oilfield Services Limited，Tianjin 300457，China) |
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Abstract With the platform size increment，the large diameter pipe piles are used in practice more and more. Pile driving maybe suspended because of many reasons during installation. Whether the driving could be re-started or not is an important problem that many people concerned. In this paper，we study the change of excess pore water pressure and effective stress during continuous and discontinuous striking with dynamic FEM. Based on FEM results，the mechanics of premature refusal caused by pile driving suspending in sand layers is discussed combined with a practical case. The results of dynamic FEM present that continuous driving causes pore water pressure accumulating around the pile tip. If the pile driving suspends，the excess pore water pressure dissipate quickly to cause the effective stress changes obviously within 1–2 times of the pile diameter. The end soil resistance increase，but the change of friction is just near the vibration fountain. The measurement data of the practical case show that after 3 months suspending，the friction in sand layer recovered and exceeded initial value，especially near pile tip. The friction increment is small in the thin sand layer between two clay layers. The friction in clay layer is still lower than the initial value. When we predict soil resistance after suspending，for the friction，the effecting scale of driving and suspending time should be considered；for the end resistance，the restarting procedure is important.
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Received: 21 September 2010
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2011, Vol. 30 
