论文部分内容阅读
This paper presents some recent advances in apparatus and methods for geotechnical centrifuge testing of offshore foundations at the University of Western Australia.We operate a 3.6 m diameter fixed-beam machine capable of accelerating modelling experiments of 200 kg up to 200 times Earths gravity and a 1.2 m drum centrifuge that can operate at up to 400 gravities.This paper describes innovative actuators developed to measure combined vertical, horizontal and moment loads in our beam and drum centrifuges.These allow independent movement in three degrees of freedom.A description is also provided of the application of sophisticated load control algorithms that can follow complex and irregular cyclic loadings from offshore storms on geotechnical infrastructure, and test results for an unburied pipeline are presented.Recent visualisation and buckling experiments on offshore pipelines are discussed.The last centrifuge advancement discussed is the use of piezoelectric and MEMS accelerometers to measure the rapid penetration of deep water dynamically installed anchors.As we look to the future we are commissioning a new 10 m diameter beam centrifuge rated at 240 g-tonnes.This paper provides details of this new centrifuge, which will be ready for use in 2015, and describes the benefits to offshore foundation modelling that this larger centrifuge will provide.