Reduction rate of dragload and downdrag of piles by taper angles |
| |
| Authors: | Gangqiang Kong Liduo Zhou Huaifeng Peng Hongwei Gu |
| |
| Institution: | 1.Key Laboratory of Geomechanics and Embankment Engineering(Hohai University),Ministry of Education,Nanjing,China;2.Jiangsu Province Communications Planning and Design Institute Limited Company,Nanjing,China |
| |
| Abstract: | Taper angle is one of the effective methods to reduce the dragload and downdrag of piles under the surcharge load. The model tests on the tapered pile and uniform cross-section pile embedded in sand were carried out under the surcharge load. The values of dragload and downdrag of piles versus the surcharge loads were measured. Based on the concentric cylinder shearing theory, a simplified theoretical model for calculating the dragload and downdrag of tapered piles with small taper angles under the surcharge load was proposed considering the angle effect. The correctness of the developed theoretical model was validated through comparing with the model test results obtained in this study and previous literature. Then the parametric studies of the taper angle, surcharge, strength and modulus of soil were discussed. It is shown that the tapered pile with the taper angle of 3° can reduce approximately 65% of the maximum dragload value and 30% of the downdrag value compared with a uniform cross-section pile. The value of downdrag can be decreased by approximately 50% compared with a uniform cross-section pile in the same average pile diameter. |
| |
| Keywords: | |
| 本文献已被 CNKI SpringerLink 等数据库收录！ |
|
