Six-Degree-of-Freedom Measurement of Plate Anchors in Centrifuge by Magnetometers

The six-degree-of-freedom movement of an offshore plate anchor is essential to evaluate anchor performance.As an emerging technology,magnetometer has shown its potential in measuring the six-degree-of-freedom movement of offshore anchors under 1-g model laboratory tests.The paper presents the feasibility of adopting a magnetometer system in geotechnical centrifuge testing.Interference factors that may affect the measuring accuracy of the magnetometer system are investigated.The results demonstrate that the magnetometer system can accurately catch the anchor movement in the soils with the restrictions of:(1)the model anchor was made with stainless steel;(2)the system was placed at least 30 cm away from the side wall of soil model tank;(3)started the measurement when the artificial acceleration by centrifuge was stable.