Proceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering - Sustainable Energy and Marine Planning
Proceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering - Sustainable Energy and Marine Planning
复制标题
第二届越南海洋工程进展研讨会论文集 - 可持续能源和海洋规划
DOI：
10.1007/978-981-16-7735-9_47
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Ciantia M
中科院分区：
文献类型：
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作者：
Ciantia M
白垩存在于英国东海岸和南海岸的大片地区，那里正在安装可再生能源。在大多数情况下，它们建立在位移桩上，其设计使用经验方法或部分（现场愿望）模拟。由于桩安装引起的桩周围白垩性质的变化不易量化，因此对颗粒破碎和孔隙压力产生等安装效应进行了保守估计（如果考虑的话）。在本文中，它是如何先进的数值模拟可以用来指导这些复杂的土壤基础的设计。桩安装过程中发展的耦合流体力学效应在白垩数值研究使用强大的和网格独立的实现在大应变的弹塑性本构模型。该模型，实施到一个开源的粒子有限元（PFEM）代码，是能够捕捉岩石的损伤，直到形成一个小直径桩轴周围的白垩腻子层。通过比较理想灌注桩和考虑全过程灌注桩的轴向承载力，分析了灌注桩的施工效果。然后，数值计算结果被用来批判地解决目前的设计规范的限制，在白垩位移桩。
Chalk is present in a large area of the East and South coast of the UK where renewables are now being installed. In most cases they are founded on displacement piles, whose design uses empirical methods or partial (wished-in-place) simulations. Installation effects such as grain crushing and pore pressure generation are conservatively estimated (if considered at all), as the change of chalk properties around the pile due to pile installation cannot be easily quantified. In this paper it is shown how advanced numerical modelling can be used to guide the design of the foundations in these complex soils. The coupled hydro-mechanical effects developing during pile installation in chalk are investigated numerically using a robust and mesh-independent implementation of an elasto-plastic constitutive model at large strains. The model, implemented into an open source Particle Finite Element (PFEM) code, is able to capture the damage of the rock until the formation of a chalk putty layer around the shaft of a small diameter pile. Installation effects are highlighted by comparing the axial performance between wished in place piles and piles which considered the full installation process. The numerical results are then used to critically address the limitation of current design specifications of displacement piles in chalk.