报告问题：Pile penetration and loadings modelled by the Discrete Element Method（沉桩历程的离散元剖析）

报告人：Associate Prof. CHENG YI PIK(University College London)

报告时间：2019年4月16日(星期二) 13:00-15:30

报告所在：校本部东区土木楼312聚会室

主讲人简介

Associate Prof. CHENG YI PIK

?Editorial Panel of ICE International journal of Geotechnique Letters (2014 Nov -)

?Editorial Panel of ICE International journal of Geotechnique (2010-2012)

?Guest editor – Computers and Geotechnics theme issue (2015-2016)

?Guest editor – Geotechnique Micromechanics Theme issue (2008-09)

?Members of Organising committee for International Symposium on Geomechanics from micro to macro (IS-Cambridge 2014)

?Session chairing, International Symposium on Geomechanics from Micro to Macro, Cambridge University, UK (2014, Sept), International Symposium on Discrete Element Modelling of Particulate Media, Birmingham University UK (2012, Mar), International Symposium of Geotechnics from Micro to Macro, Tongji University Shanghai China (2010 Oct).

报告简介

With a rising demand for renewable, sustainable and green energy sources, offshore wind industry is experiencing a rapid expansion. The most common type of support structure for offshore wind turbines are large-diameter monopiles. With this initial motivation in mind, a model pile were carefully created using the two-dimensional discrete element method. This numerical method is capable of modelling large strain particles movement around the pile. The grid method with an increased level of gravity was proposed in order to successfully and efficiently reproduce the uniformly increasing stresses ground condition of the granular sand.

The behaviour of pile penetration was then investigated, revealing the inter-relationship between volume change of the granular mass, the horizontal stress reversal and the friction degradation at pile shaft at different relative distance from the pile tip. After pile installation, the subsequent axial loading behaviour was also investigated, in which the distinct behaviour of different pile types will be highlighted. The monotonic horizontal loading simulations data matched well with a set of published centrifuge experimental data, showing non-linear load-displacement responses of the pile. Further investigations on the cyclic horizontal loadings will be also shown and explained.