›› 2011, Vol. 32 ›› Issue (6): 1819-1823.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of improvement mechanism of compaction-widening piles by tamping in collapsible loess foundation

NIE Qing-ke1, 2, LIANG Jin-guo1, HAN Li-jun1, LI Hua-wei1, 2   

  1. 1. Hebei Research Institute of Construction and Geotechnical Investigation Co. Ltd., Shijiazhuang 050031, China; 2. Research Center of Geotechnical Engineering Technology of Hebei Province. Shijiazhuang 050031, China
  • Received:2010-01-15 Online:2011-06-10 Published:2011-06-21

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Abstract: According to a practical case of composite foundation in collapsible loess foundation, the squeezing effects on compaction pile by tamping are studied. In field test, the undisturbed samples before treatment and the samples after treatment are first obtained; and then the physical parameters (e.g. void ratio, coefficient of collapsibility, coefficient of compactness, etc) are studied. Using the test results, the squeezing effects of the soil between piles with loading variation are discussed. Besides, the affecting scopes in horizontal and vertical directions are also analyzed. Finally, the reasonable spacing between piles which should be used in practical applications is discussed.

Key words: compaction-widening pile, collapsible loess, improvement mechanism, coefficient of collapsibility, spacing between piles

CLC Number: 

  • TU473
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