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http://dx.doi.org/10.7843/kgs.2007.23.8.35

Axial Behavior of Non-Displacement Tapered Piles in Sand  

Paik, Kyu-Ho (Dept. of Civil Eng., Kwandong Univ.)
Lee, Jun-Hwan (Dept. of Civil and Environmental Eng., Yonsei Univ.)
Kim, Dae-Hong (KEPRI/KEPCO)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.8, 2007 , pp. 35-45 More about this Journal
Abstract
It is known that the response of piles is affected by the shape of pile as well as soil conditions. In order to investigate the characteristics of the axial responses and bearing capacities of non-displacement tapered and cylindrical piles in sands, 12 model pile load tests using a calibration chamber were conducted on model tapered and cylindrical piles, which were specially manufactured to measure the base and shaft load capacities independently. Results of the model tests showed that the shaft load of tapered piles continuously increased with pile settlement, whereas the shaft load of cylindrical piles reached ultimate values at a settlement equal to 4% of pile diameter. Therefore, taper piles have greater shaft loads than cylindrical one at the same settlement. It is also observed that the total load capacity of tapered piles is lower than cylindrical piles for dense sand but is greater than that of cylindrical piles for medium sand. The ultimate unit base resistance of tapered piles was greater than that of cylindrical piles for lateral earth pressure ratio greater than 0.4, and the shaft resistance was greater than that of cylindrical piles irrespective of lateral earth pressure ratio.
Keywords
Axial behavior; Base load capacity; Calibration chamber test; Shaft load capacity; Tapered pile;
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