›› 2009, Vol. 30 ›› Issue (9): 2609-2615.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Strengthening effect of total pile lateral friction by improving rock or soil strength at pile tip

JIANG Jian-ping1, GAO Guang-yun2, ZHANG Yang-song3   

  1. 1. College of Ocean Environment and Engineering, Shanghai Maritime University, Shanghai 201306, China; 2. College of Civil Engineering, Tongji University, Shanghai 200092, China; 3. Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2008-03-17 Online:2009-09-10 Published:2010-03-24

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Abstract:

Based on comparative field tests of 15 super-long piles in 5 sites and comparative elastoplastic FEM numerical simulation of 2 super-long piles, the effect of the improvement of rock or soil strength at pile tip on total super-long pile lateral friction is studied. It is found that the total lateral friction of super-long pile increases 29.86 % ?112.17 % after reducing the thickness of residue at pile tip, or there is no residue at pile tip; the total lateral friction of super-long pile increases 33.07 % ? 66.95 % after grouting at pile tip; the total lateral friction of super-long pile increases 23.34 % ?235.65 % after penetrating pile tip into harder soil or rock stratum. It is concluded that, like general piles (short piles and middle-long piles), the improvement of rock or soil strength at pile tip can strengthen the total lateral friction of super-long pile.

Key words: piles, lateral friction, rock or soil strength, tests, numerical simulation

CLC Number: 

  • TU 473.1+1
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