›› 2010, Vol. 31 ›› Issue (5): 1564-1568.

• Geotechnical Engineering • Previous Articles     Next Articles

Research on pile floatation in prefabricated pile construction in soft soil foundation

ZHU Kui1, WEI Gang2, XU Ri-qing1   

  1. 1. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310027, China; 2. Department of Civil Engineering, City College of Zhejiang University, Hangzhou 310015, China
  • Received:2008-08-25 Online:2010-05-10 Published:2010-05-24

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Abstract:

In order to study the rule of pile floatation in prefabricated pile construction, in-situ test for pile floatation in prefabricated pile construction in Wenzhou has been carried out systematically. Test results hold that pile floatation is related to construction distance and construction order. In addition, pile floatation is larger when pile construction quantity per date is more, pile final-pressure value is higher and soil on the periphery of pile is harder. According to test data, it is found that pile floatation is different with different pile penetration length, but the pile penetration speed doesn’t influence on pile floatation speed. What’s more, pile pre-drill hole, release hole as well as barrier can reduce effectively pile floating. Finally, the paper suggests redriving pressure value determination must be based on local experience in relation of the single pile vertical supporting capacity characteristic value, soil characteristics, pile length as well as the pile supporting level.

Key words: soft soil foundation, prefabricated pile, pile floatation, in-situ test, redriving

CLC Number: 

  • TU 473
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