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Installation of marine structures by suction - hydro-mechanical coupled numerical modelling

吸力安装海洋结构物 - 水力耦合数值模拟

基本信息

批准号：
289128395
负责人：
Professor Dr.-Ing. Jürgen Grabe
金额：
--
依托单位：
Institut für Geotechnik und Baubetrieb B-5
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/289128395?language=en
关键词：
Installation marine structures suction hydro

项目摘要

The objective of the research project is the investigation of the installation process of suction buckets/suction caissons, which penetrate by application of suction into the seabed consisting of saturated sand or layered soil. The load bearing behaviour with respect to the installation process is investigated as well as the process of extraction of the bucket out of the seabed supported by excess pressure. Building on results of existing model tests of the process of installation and extraction as well as the load bearing behaviour, additional model tests in a geotechnical centrifuge are performed to investigate the drainage behaviour of the soil during the installation, load bearing and extraction. The process of installation and extraction and the load bearing behaviour is also investigated through numerical methods. Therefore, the coupled mechanical hydraulically processes in the soil are better understood and the influence of the installation process on the load bearing behaviour is investigated. An approach, which is existing at the institute, is extended and utilised for investigations on the coupled mechanical hydraulically behaviour in saturated sand and layered soil Therefore, the Finite Element Method (FEM) is utilised for simulations of the load bearing behaviour. Furthermore, the Material-Point Method (MPM) is utilised for simulations of the installation process. Since the MPM-source-code is available at our institute, the program modifications and extensions for any specific problem are feasible. The MPM-models for the simulation of the installation and the FEM-models for the simulation of the load bearing behaviour are validated and applied for a parametric study to investigate different influences.

该研究项目的目的是调查吸力桶/吸力沉箱的安装过程，这些吸力桶/吸力沉箱通过施加吸力进入由饱和砂或分层土壤组成的海床。研究了安装过程中的承载性能，以及将吊桶从由超压支撑的海床中拔出的过程。在现有的模型试验的结果的基础上，安装和提取的过程中，以及承载行为，在土工离心机进行额外的模型试验，以调查在安装，承载和提取过程中的土壤的排水行为。安装和提取的过程和承载行为也通过数值方法进行了研究。因此，耦合的机械液压过程中的土壤更好地理解和承载行为的安装过程的影响进行了研究。一种方法，这是现有的在该研究所，扩展和用于调查的耦合力学水力行为在饱和砂土和层状土壤因此，有限元法（FEM）是用于模拟的承载行为。此外，材料点法（MPM）用于模拟安装过程。由于MPM源代码在我们的研究所，任何特定的问题的程序修改和扩展是可行的。验证用于模拟安装的MPM模型和用于模拟承载行为的FEM模型，并将其应用于参数研究，以调查不同的影响。