Numerical Analysis of Gravity Coring Using Coupled Eulerian-Lagrangian Method and a New Corer |
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| Authors: | Huawei Qin Zhen Cai Jianjun Wang Wei Ye Ying Chen |
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| Institution: | 1. The Institute of Mechatronic Engineering, Hangzhou Dianzi University, Hangzhou, China;2. Ocean College, Zhejiang University, Zhoushan, China;3. Shanghai Institute of Aerospace Systems Engineering, Shanghai, China;4. University of Wolverhampton, Telford, UK;5. Department of Ocean Science and Engineering, Zhejiang University, Hangzhou, China |
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| Abstract: | The shortcomings of gravity corers in sampling marine sediments have been observed extensively in various field tests. In order to optimize the coring, this article provides an alternative numerical way to model the gravity coring and analyze the sampling effect. Based on this analysis, a new hydraulic hammer corer is devised. A coupled Eulerian-Lagrangian method with capability of simulating the problem involving extreme deformation, penetration is used to simulate the coring process. The results show that the hydrostatic pressure and deviator stress increase and reach their peak when the pile tip is slightly above or at the level of the observation point and then drop rapidly when the pile tip slides below the observation point. In addition, the stress path indicates that the soil element sustains plastic compression before yielding and then expands until recovering to the original state. The obvious “under-sampling” phenomenon is also well-captured by the finite element model. |
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| Keywords: | coupled eulerian-lagrangian gravity coring simulation novel hydraulic corer |
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