| dc.description.abstract | In Taiwan, due to the narrow land, high population density and lack of electricity, it is imperative to develop green energy, and wind power is important part of it. The monopile of offshore wind turbine on the sea must be able to withstand cyclic lateral loading induced by wind, wave and earthquake. Therefore, in this research, using Zhunan sand to remold the saturated specimen of relative density 80% and using Zengwun Reservoir clay to remold consolidated specimen, and using the model pile to carry out a series of one-way cyclic lateral loading, and it simulated the wave acting on the offshore monopile. The research use regression analysis method to obtain the pile response, and the behavior of pile-soil interaction is dicussed.
In this research, first, the ultimate lateral loading test was carried out. The bending moment was measured by the test and using regression analysis method to obtain change of bending moment, shear force, soil resistance, rotation, and displacement with depth. The p-y curve of static test was established, and compared with p-y curve by API, DNV, Matlock, and Reese suggested. Second, the one-way cyclic lateral loading test was carried out. The pile load and the pile displacement can be used to calculate and obtain permanent displacement and pile stiffness.
According to the test result, the static p-y curve of saturated sand are higher than the suggested p-y curve of Reese and API in four times diameter of pile. However, the suggested p-y curve of consolidated clay are lower than the suggested p-y curve of Matlock, DNV, and API. The permanent displacement of saturated sand and consolidated clay increased with increase of load amplitude, the permanent displacement were 0.7% to 2.55% and 2.55% to 5.1% respectively. | en_US |