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Analytical solution for negative frictional force of pile foundations in dredging site with consideration of selfweight consolidation |
| Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Due to the bad characteristics of dredger fill soil with high compressibility and low permeability, the pile foundation in dredging site has obvious specificity, which leads to the negative skin friction between soils and piles. To solve the problem, the onedimensional consolidation model of doublelayered ground was adopted to calculate the consolidation deformation in the dredger fill and underlying soil layer. The bilinear function was used to simulate the interaction between piles and soils. The interaction model between piles and soils was established, and the analytical solutions of neutral point position, axial force and frictional force were obtained for different depth and time. By comparing the calculation results with the measured data, the solutions were proved to be practicable. Based on the analytical solution, the effects on frictional force, axial force and neutral point position were analyzed. The solutions of neutral point position and pull down load were compared with the calculation results from JGJ 94—2008 of technical code for building pile foundation. The results show that the pile foundation code of JGJ 94—2008 overestimates the influence of negative frictional force on the capacity of pile foundation, because the effects of pile load and soil consolidation before the pile driving are ignored.
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