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Collision Analysis Between Spudcan and Seabed During the Process of jack-up platform Lowering jack-up Legs

China Ocean Engineering 2021年第5期35卷 779-788页

作者： LE Cong-huan LI Yan-e HUANG Lei REN Jian-yu DING Hong-yan ZHANG Pu-yang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China China Classification Society(CCS) Tianjin 300457China

In the leg-lowering process,the offshore jack-up platform is in a floating state,and the spudcan may collide with the seabed due to the platform motion in waves,thereby threatening the safety and stability of the *** paper first analyzed the hydrodynamic response of a jack-up platform under different sea *** a finite-element model was established which considered the material and geometrical nonlinearity in the structure and the nonlinear interaction between soil and structure to investigate the collision response between the spudcan and seabed during lowering jack-up *** results show that the dynamic response of the platform decreases and gradually tends to be stable as the wave period *** motion response of the platform reach the largest value when the wave period is 8 s and the wave direction is 0°.The collision angle between the spudcan and seabed has a large influence on the collision response,while the velocity of leg-lowering has little influence on the collision *** collision response is also significantly affected by soil *** clay,the increase in undrained shear strength and Young’s modulus will increase the impact force.

关键词： jack-up platform spudcan collision dynamic response

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Design of A Bionic Spudcan and Analysis of Penetration and Extraction Performances for jack-up platform

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China Ocean Engineering 2020年第1期34卷 80-88页

作者： GUO Sheng ZHUANG Hong TANG Wen-xian WU Wen-le LIU Qin WANG Yue-yang School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment Jiangsu University of Science and TechnologyZhenjiang 212003China

The mechanisms of soil structure interaction have drawn much attention in the past years in the installation and operation of jack-up platform. A bionic spudcan produced by biomimetic of egg and snail shell is proposed, and the performance of the penetration and extraction are analyzed by numerical method. The geometric contour of egg and snail shell is measured, and its mathematical model is established respectively. According to the structure of existing spudcan of jack-up platform, three kinds of typical biomimetic spudcan are designed. Furthermore, numerical analysis models of biomimetic spudcan are established respectively to study the soil structure interaction mechanism in the process of penetration and extraction, and contrastive analysis of resistance characteristics are carried out. To conclude, the results show that the biomimetic spudcan facilitates the platform installation, and it is also beneficial to the improvement of the bearing capacity of spudcan.

关键词： jack-up platform egg shell snail shell bionic design spudcan soil structure interaction

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Dynamic evaluation of jack-up platform structure under wave, wind, earthquake and tsunami loads

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Journal of Ocean Engineering and Science 2022年第1期7卷 41-57页

作者： Zaid Mohammed Ghazi Imad Shakir Abbood Farzad Hejazi Department of Civil Engineering Universiti Putra MalaysiaMalaysia Engineering Affairs Department Sunni Endowment DiwanBaghdadIraq

Nowadays,the demand for using jack-up platforms to carry out a large percentage of deep-water oil and gas exploration is steadily *** response of jack-up platforms to the severe dynamic loads that may be encountered during the structure life is not examined ***,this study attempts to investigate the response of jack-up platforms performance under the effect of dynamic loads due to wave,wind,earthquake and tsunami forces using the finite element method for two models with the lowest and highest hull *** jack-up platform is located in the Gulf of *** ac-celerations are applied to the model in high and moderate seismic *** addition,tsunami waves are applied to the platform in three different directions at 0°,45°and 90°.This study utilised Airy’s linear wave approach to assess the surface elevations and wave *** reference wind velocity is 10 knots at 10 m over the mean water *** indicate that the dynamic response of the structure is affected by the height of the platform and by the increase of the platform hull *** combination of the El-Centro earthquake,dead and live loads provides the major impact on the platform at the lowest(70 m)and highest(85 m)hull *** comparison of all result proves that the jack-up platform hull under high earthquake intensity and tsunami waves with 45°has experienced maximum ***,raising the deck will increase the response of the dynamic load and displacements but will negatively affect the platform.

关键词： Offshore structures Earthquake Dynamic excitation jack-up platform Tsunami Seismic zone

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Bearing Capacity and Critical Punch-Through Depth of Spudcan on Sand Overlying Clay

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China Ocean Engineering 2014年第1期28卷 139-147页

作者：刘君于龙周慧孔宪京 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

Spudcan may experience punch-through failure on strong over weak layered soils, such as sand overlying clay. A large deformation finite element method （LDFE） is used to simulate the penetration process of spudcan into sand overlying clay. The sand is simulated by smoothed hyperbolic Mohr-Coulomb model, and the clay is simulated by a simple elasto-plastic model which obeys Tresca yield criterion. According to the LDFE results of a large amount of cases, the effects of the strength, unit weight and thickness of the top sand layer, as well as the effect of the strength of the underlying clay on the spudcan punch-through behavior, are investigated. The critical depth occurring punch-through and the critical bearing capacity are presented in charts. Fitting equations to calculate the critical punch-through depth and the critical bearing capacity are proposed for the convenience of engineering practice.

关键词： spudcan foundation punch-through sand overlying clay double layer jack-up platform

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