Numerical Analysis of Fully Plugged Pipe Pile Groups in Sandy Soil

作     者：M Y Fattah N M Salim A M B Al-Gharrawi 

作者机构：Professor Building and Construction Engineering Department University of Technology Baghdad Iraq. Lecturer Civil Engineering Department University of Kufa Iraq. 

出 版 物：《IOP Conference Series: Materials Science and Engineering》 

年 卷 期：2018年第433卷第1期

摘      要：Plugging is essential not only due to its direct contribution to pile end load carrying capacity but also due to its indirect contribution to mobilised shaft capacity. A pile with a plug displaces more soil than a pile that penetrates in boring mode, which enlarges the effective stresses around the pile. Numerical modelling of plugged pipe piles was carried out using PLAXIS-2015 software, with the Hardening Soil Model (HS small) used for soil modelling. The parametric study presented in this research was carried out with this computer program based on the finite element method. The case of a pipe pile group (2 × 2) with full plug was chosen as the basic problem, with spacing between piles of 3.0 m. It was concluded that there is slight increase in pile group capacity when increasing the spacing between piles by about 2.8%. It was found that the change of the angle of friction was the most important parameter; its increase from 31o to 40o caused an increase in the shear stress of about 150%.