Bucket group effect of the composite multi-bucket structure

Abstract

As a novel type of foundation in beach and shallow sea, the bucket structure is especially suitable for complex conditions such as soft clay ground and the worse types of sea environments. In this paper, the bearing capacity of a multi-bucket structure is studied by experiments with a single bucket and four-bucket foundation in a saturated sand layer. Based on the experimental data and numerical analysis results, the bearing capacity behavior and the bucket group effect are compared and analyzed. Furthermore, some influential factors, such as the soil type, the ratio of length to diameter L/D, the ratio of the bucket spacing to the bucket diameter S/D, and the bucket number are introduced and their effects on the multi-bucket structural capacity are investigated. The vertical static capacity adjustment factor is introduced to evaluate the bucket group effects of the multi-bucket foundation.

Keywords

bucket group effect / composite multi-bucket structure / bearing capacity / displacement control method / vertical static capacity adjustment factor

References

[1] Allotey N, El Naggar MH. Generalized dynamic winkler model for nonlinear soil structure interaction analysis. Canadian Geotechnical Journal, 2008, 45(4): 560-573

[2] Andersen L, Ibsen L, Liingaard M. Lumped-parameter model of a bucket foundation. Computational Geomechanics, 2009, 731-742

[3] Houlsby GT, Ibsen LB, Byrne BW. Suction caissons for wind turbines. International Symposium on Frontiers in Offshore Geotechnics, 2005, 75-93

[4] Ibsen LB. Implementation of a new foundations concept for offshore wind farms. Proceedings of the 15th Nordic Geotechnical Meeting, 2008, 19-33

[5] Li C, Lu X, Wang S. Study on the capacity degradation of bucket foundation in liquefied sand layer under cyclic loads. The Open Ocean Engineering Journal, 2010, 10(3): 86-92

[6] Liingaard M, Andersen L, Ibsen L. Impedance of flexible suction caissons. Earthquake Engineering and Structural Dynamics, 2007, 36(13): 2249-2271

[7] Lu XB, Wang SY, Zhang JH, Sun GL, Shi ZM. Experimental study of pore pressure and deformation of suction bucket foundations under horizontal dynamic loading. China Ocean Engineering, 2005, 19: 671-680

[8] Lu X, Jiao b, Liu L. Experimental Study on the Bearing Capacity of Bucket Foundation in Saturated Sand. Geotechnical Engineering Technique, 2006, 20(4): 170-174

[9] Senders M. Tripods with suction caissons as foundations for offshore wind turbines on sand. Proceedings of International Symposium on Frontiers in offshore Geotechnics, 2005, 917-934

[10] Sun X. A Study on Working Mechanism and Bearing Capacity Performance of Bucket Foundation in Soft Ground under Lateral Loads, 2009, Da Lian: Dalian University of Technology, 19-26

[11] Varun Assimaki D, Gazetas G. A simplified model for lateral response of large diameter caisson foundations-linear elastic formulation. Soil Dynamics and Earthquake Engineering, 2009, 29(2): 268-291

[12] Wu K. A Study on bearing capacity behavior of suction bucket foundation in beach-shallow sea, 2007, Da Lian: Dalian university of technology, 34-44

[13] Zhang J, Zhang X. Finite element analysis of a cofferdam with bucket foundations at Zhuanghai artificial island. The Open Ocean Engineering Journal, 2010, 3: 63-68