Xu, N. and Huo, S., 2020. A new measurement system of large-scale steel pipe pile test for offshore wind farm. In: Yang, Y.; Mi, C.; Zhao, L., and Lam, S. (eds.), Global Topics and New Trends in Coastal Research: Port, Coastal and Ocean Engineering. Journal of Coastal Research, Special Issue No. 103, pp. 351–354. Coconut Creek (Florida), ISSN 0749-0208.

The large-scale steel pipe pile filled with concrete is usually adopted as the foundation of wind farm in China which subjected to the loads including wind turbine weight, wind, wave, fluent and so on. There is high requirement of bearing capacity and deformation of foundation for the wind turbines and it is difficult to measure the displacement accurately using traditional displacement measurement system because of environmental load variation. This paper presents a new method of displacement measurement that the linear displacement underground can be transformed into angular displacement on the ground, and angular displacement can be transformed into some pulse signal through a snap-sheet device and grating sensor. According to the number of pulse signal, the grating groove density and diameter of the wheel, the corresponding displacement can be calculated, and operating procedures is developed for measurement based on LabVIEW software. This new measurement system has the advantages of easy installation, accuracy measurement, simple operation and high reliability and it has high applicability for offshore pile tests.