Numerical Study on the Effect of Spudcan Penetration on the Jacket Platform

Authors: Xiangming Ge, Bing Pan, Wei He, Hao Chen, Yong Zhou, Jiayao Wu, Weijiang Chu

Abstract:

How the extraction and penetration of spudcan affect the performance of the adjacent pile foundation supporting the jacket platform was studied in the program FLAC3D depending on a wind farm project in Bohai sea. The simulations were conducted at the end of the spudcan penetration, which induced a pockmark in the seabed. The effects of the distance between the pile foundation and the pockmark were studied. The displacement at the mudline arose when the pockmark was closer. The bearing capacity of this jacket platform with deep pile foundations has been less influenced by the process of spudcan penetration, which can induce severe stresses on the pile foundation. The induced rotation was also satisfied with the serviceability constraints.

Keywords: Offshore foundation, pile-soil interaction, spudcan penetration, FLAC3D.

References:

[1] Itasca consulting group, inc. (2019) flac3d — fast lagrangian analysis of continua in three-dimensions, ver. 7.0. minneapolis: Itasca.
[2] Guidance notes on geotechnical performance of spudcan foundations, 2018.
[3] Code for design of wind turbine foundations for offshore wind power projects, 2019.
[4] Subrata K. Chakrabarti. Chapter 4 - loads and responses. In SUBRATA K. CHAKRABARTI, editor, Handbook of Offshore Engineering, pages 133–196. Elsevier, London, 2005.
[5] Y. K. Chow, Y. Xie, and C. F. Leung. Centrifuge modelling of spudcan–pile interaction in soft clay. G´eotechnique, 62(9):799–810, 2012.
[6] Q. Gang and J. Grabe. Numerical investigation of bearing capacity due to spudcan penetration in sand overlying clay. Canadian Geotechnical Journal, 49(12):1393–1407, 2012.
[7] Q. Gang, S. Henke, and J. Grabe. 3d fe analysis of the installation process of spudcan foundations. In Frontiers in offshore geotechnics II, 2011.
[8] Y. S. Kuo, M. Achmus, and K. Abdel-Rahman. Estimation of lateral deformation of monopile foundations by use of cyclic triaxial tests. Chinese Journal of Geotechnical Engineering, 11(11):1729–1734, 2009.
[9] R. H. Lyons. Effects of spud cans on adjacent piled structures. The Jack-up Drilling Platform Design and Operation, 1986.
[10] U. A. Mirza, M. A. Sweeney, and A. R. Dean. Potential effects of jackup spud can penetration on jacket piles. Offshore Technology Conference.
[11] G. Qiu and S. Henke. Controlled installation of spudcan foundations on loose sand overlying weak clay. Marine Structures, 24(4):528–550, 2011.
[12] XM Tan, JY Guo, and C Lu. Effect of spudcan penetration on neighboring existing pile. In The Sixteenth International Offshore and Polar Engineering Conference. OnePetro, 2006.
[13] K. K. Tho, C. F. Leung, Y. K. Chow, and S. Swaddiwudhipong. Eulerian finite element simulation of spudcan-pile interaction. Canadian Geotechnical Journal, 50(6):595–608, 2013.
[14] P. L. Tirant and C P´erol. Stability and operation of jackups /edited by pierre le tirant, christian p´erol ; translated from the french by nissim marshall. 1993.
[15] J. Wang, Y. Fan, and J. Ma. Numerical simulation of effects of the spudcan penetration on pile groups of jacket platforms.
[16] JH Wang YF Fan. Method ro analyze the effect of spudcan penetration on an adjacent pile group. Rock and Soil Mechanics, v.41;No.317(07):210–218, 2020.