Bearing Capacity and Deformations of Pile Foundations in Layered Soils

• Main Authors: KuanWu Lin, 林冠吾
• Other Authors: DerWen Chang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/14329705578146750662

碩士 === 淡江大學 === 土木工程學系 === 91 === This study presents the modified wave equation analysis for vertical and lateral responses of the pile foundations in layered soils. Linear springs from the t-z and p-y curves and nonlinear springs from the Novak’s model were implemented considering the geology and material variations of the sites. Other than the revisions of the analysis, the pile load-settlement curves from a number of the vertical pile load tests were simulated iterating the soil spring constants according to the pre-calculated pile displacements. After the comparative studies, it is found that the modified analysis is appropriate in making more accessible PLT data. The predictions on the vertical pile capacities agree reasonably with the reported ones. Major conclusions are drawn as follows: 1. The pile responses are mostly affected by the ratio of the pile-to-soil modulus (Ep/Es). The influence of the slenderness ratio (L/r) is less important, and other design parameters seems relatively trivial to the solutions. 2. The pile deformations and the influential pile lengths were found greater in the analysis where the nonlinear soils were encountered. The pile deforms dependently with the soils at the shallower depths. 3. The nonlinear soil model is better than the linear soil model for the analysis, however the soil parameters need to be properly controlled. 4. The suggested analysis can extrapolate suitably the pile load-settlement curve and let the data be more useful for respective interpretation methods of the pile capacity.