Negative Skin Friction on a single pile . Progress in Civil, Architectural and Hydraulic Engineering IV: Proceedings, London, 343-346.
5. Mashhour, I 2016. Experimental study on negative skin friction on piles in collapsible soils due to inundation : a thesis for the degree of Doctor of Philosophy (Civil Engineering) / Ibrahim Mashhour; Concordia University. – Quebec, 171.
6. Sedin, V and Bikus, K and Kovba, V 2017. Investigation of redistribution of pile foundation forces under successive loading of its elements. Civil and Environmental Engineering
-European Conf. on Geotechnical Engineering, Bratislava, Slovak Republic, June 2-4, 2010, 237+CD.
 KRASIŇSKI A., Field tests of screw displacement piles and columns SDP and SDC , Drogi i Mosty, 2011a, No. 1-2, pp. 21-58 (in Polish).
 KRASIŇSKI A., Results of field tests of screw displacement pile and columns , Inźynieria Morska i Geotechnika, 2011b, No. 6, pp. 510-530 (in Polish).
 KRASIŇSKI A., Bearing capacity and interaction with soil of screw displacement piles , Final report of research project No. N N506 432936 for the Polish Ministry of Science and
Almeida, V. S. - De Paiva, J. B. (2007) Static analysis of soil/pile interaction in layered soil by BEM/BEM coupling. Advances in Engineering Software. No. 38, pp. 835-845.
Brown, D. A. (2005) Practical consideration in the selection and use of continuous flight auger and drilled displacement piles. Advances in design and testing deep foundations, Texas, U.S., pp. 251-261.
Coyle, H. M. - Reese, L. C. (1966) Load transfer for axially loaded piles in clay. Soil Mechanics and Foundations 1966, No. 92, pp
” Dublin, 13–14 June 2013.
 B udhu M., Soil Mechanics and Foundations , Wiley, Hoboken, New York 1999.
 C ai G., L iu S., T ong L., D u G., Assessment of direct CPT and CPTu methods for predicting the ultimate bearing capacity of single piles , Eng. Geol., 2009, 104, 211–222.
 C ai G., L iu S., P uppala A.J., Reliability assessment of CPTu-based pile capacity predictions in soft clay deposits , Eng. Geol., 2012, 141–142, 84–91.
 DNV-OS-J101-2007: Det Norske Veritas. Design of offshore wind turbine structures . October 20007
 KIM, H.T., KATZENBACH, R. and KIMURA, M., Technical session 2g: Pile foundations (I): Piled rafts, bearing capacity, and analysis, Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment 2005, ICSMGE 2005, Osaka, Japan, 2005, pp. 3193-3195, ISBN: 9059660285;978-905966028-1.
 BAZIAR, M. H., GHORBANI, A., & KATZENBACH, R., Small-scale model test and threedimensional analysis of pile-raft foundation on medium-dense sand
A number of analyses are available for the estimation of the settlement of piles and pile groups based on the continuum approach [ 1 , 2 , 3 ], but most of them are for homogeneous piles and soil masses. The reasons for the non-homogeneity of granular piles have been discussed by Madhav et al. [ 4 ] and Gupta and Sharma [ 5 ].
Analysis of a non-homogeneous floating granular pile was presented by Madhav et al. [ 4 ], considering the linear variation of the deformation modulus with the length of the granular pile. Gupta and Sharma [ 5
Piled raft is a geotechnical foundation consisting of three elements raft, piles, and soil domain. The piles can be used to reduce the settlement of the raft foundation (Burland 1977). Also, several studies suggested that the piles in piled raft can be used to carry some part of the superstructure load. The distribution of among load among the piles, raft, and soil depends on their relative stiffness. On the basis of the dimensions of the raft and piles, the piled raft can be classified as a small piled raft ( B r < L p ) and large piled raft
 Dassault Systèmes. (2013). Abaqus User Manual Version 6.13.
 YU M.-H., MA G.-W., QIANG H.-F., ZHANG Y.-Q., Generalized Plasticity, Springer, Berlin, 2006, DOI: 10.1007/3-540-30433-9.
 TOMLINSON M., WOODWARD J., Pile design and Construction Practice, (5th ed.), Taylor & Francis, New York 2008.
 BUSTAMANTE M., GIANESELLI L., Pile bearing capacity prediction by means of static penetrometer CPT, Proceedings of the 2-nd European Symposium on Penetration Testing, May 1982, pp. 493-500.
of Computational Mechanic , Vol. 1. Fundamentals , John Wiley & Sons, Ltd., 2004, 413–437, DOI: 10.1002/0470091355.ecm009.
 H amann T., Q iu G., G rabe J., Application of a Coupled Eulerian–Lagrangian approach on pile installation problems under partially drained conditions , Computers and Geotechnics, 2015, 63, 279–290, DOI: 10.1016/j.compgeo.2014.10.006.
 K omurka V.E., W agner A.B., E dil T.B., A Review of Pile Set-Up , Proc., 51st Annual Geotechnical Engineering Conference, 2003.
 M absout M.E., T assoulas J.L., A finite
1. Han F., Salgado R., Prezzi M., Lim J.: Shaft and base resistance of nondisplacement piles in sand. Computers and Geotechnics, vol.83, 2017, P:184-197.
2. Ivšić T., Bačić M., Librić L.: Estimation of bored pile capacity and settlement in soft soils. Gradjevinar, vol.65, 2013, P:901-918.
3. Lehane B.M. et al.: Mechanism of shaft friction in sand from instrumented pile tests. vol.119, 2016, P:19-35.
4. Kamal Z.A., Arab M.G., Dif A.: Analysis of The arching phenomenon of bored piles in