›› 2011, Vol. 32 ›› Issue (10): 3089-3096.

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of working performance of piles beneath excavation bottom and settlement calculation

ZHENG Gang1, 2, ZHANG Li-ming1, 2, DIAO Yu1, 2   

  1. 1. Department of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. MOE Key Laboratory of Coast Civil Structures and Safety, Tianjin University, Tianjin 300072, China
  • Received:2011-02-21 Online:2011-10-10 Published:2011-10-13

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Abstract: The effect of deep excavation on piles beneath the excavation bottom should not be ignored. Based on the verified finite element parameters of a project in Tianjin, load tests with sleeve and under excavation of piles with different lengths are analyzed. The characters of load transfer and settlement of piles designed by conventional pile load tests are analyzed in deep soft soil region. From the finite element analysis results, some conclusions are drawn as follows. The shaft resistance and tip resistance of piles beneath the excavation bottom are mobilized asynchronously. The tip resistance ratios are almost zero under working loads for piles longer than 40 m. The shaft resistance distributes in a ‘R’ pattern. There are even tensile forces in the lower part of piles under working loads. The friction on the lower part is negative for piles longer than 80 m. The settlement calculated considering shaft resistance distribution influenced by excavation is closer to observed data than that of Geddes solution.

Key words: excavation, load transfer, finite element analysis, settlement calculation

CLC Number: 

  • TU 471
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