›› 2009, Vol. 30 ›› Issue (6): 1671-1675.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Soil plugging effect of PHC pipe pile during driving into soft clay

XIE Yong-jian1，WANG Huai-zhong2，ZHU He-hua3   

  1. 1. Shanghai Geotechnical Investigations & Design Institute Co., Ltd., Shanghai 200438, China; 2. Baoshan Steel Limited Stock Company, Shanghai 201900, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
  • Received:2008-01-15 Online:2009-06-10 Published:2011-03-09

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Abstract:

Both the driving response and the bearing capacity of open-ended piles are affected by the soil plug that forms inside the pile driving. Field tests are conducted to investigate the plugging behavior of long PHC pile during driving into soft clay. Based on the field tests of long PHC pile in Shanghai soft foundation, soil plug data of 44 piles in three different fields are analyzed. For the PHC piles, the soil plug length is continuously measured during pile driving, allowing calculation of the incremental filling ratio (IFR) and the plug length ratio (PLR) for the pile. The test results show that normalized plug length (the ratio of plug length to pile inner diameter) and IFR vary with normalized pile length (the ratio of pile penetration depth to pile inner diameter) for different types of piles. It is shown that the value of IFR decreases for long PHC pile driving through shallow soil layer into deep soft soil, and the value of IFR increases for long PHC pile driving through deep soft soil into bearing stratum (fine sand). A relationship between IFR and PLR is proposed. The relationship between IFR and PLR allows the quick estimation of IFR based on the measuring data of PLR.

Key words: soft soil foundation, PHC pipe pile, pile driving, soil plugging effect

CLC Number: 

  • O 319.56
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