Proceedings of DFI-India 2018: 8th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Negative Skin Friction on a Pile - Effect of Drainage Condition
Prince Kumar and Satyanarayana M. Dasaka, Associate Professor
Negative skin friction (NSF) is a common problem in the design of pile, where soft soil presents. The soft soil applies drag on the pile when soil settlement is more than the pile. The NSF is a very complex problem because it depends on several factors. In this paper, finite element method (FEM) is used to simulate and analyse the pile-soil interaction problem of negative skin friction. For the analyses, modified cam-clay (MCC) model, Mohr-Coulomb (MC) model, Hoek-Brown model, and linear elastic model are used for soft clays, sand, rock, and pile, respectively. The model is validated with a known case history. The development of dragload, downdrag, and the location of the neutral plane (NP) are investigated and they match well with field data. Detailed parametric studies on the effect of drainage condition on the location of NP and development of dragload are conducted in this study. From this parametric study, it is observed that the depth of NP is different for one-way and two-way drainage conditions during the consolidation process, but it is same at the end of the consolidation for both drainage conditions. The surcharge load does not have any influence on depth of NP, but dragload increases with surcharge load.
|article #3177; publication #1050 (India2018)|