As a new type, the prefabricated wind turbine foundation is advanced with eco-friendly, energy-reservation and high efficiency, but there are few researches whether the prefabricated wind turbine foundation is adequate on stiffness and capacity under lateral load. The behavior of the prefabricated wind turbine foundation under lateral force is studied in this paper by FEM and theoretical analysis. The results show that the deformation behavior of prefabricated foundation under the lateral load is similar to the embedded bucket foundation. Comparing with the cast-in-situ concrete foundation, the stress state of prefabricated concrete foundation did not become worse. The front soil pressure of the foundation shows an approximate linear decrease with depth when the lateral load is low, and the deformation of soil is mostly elastic. The front soil pressure increase first and then decrease when the load is high, which means the soil has reached yield limit. Basing on theoretical analysis, the shear performance of the contact surfaces between adjacent prefabricated blocks was checked, and the results show that the shear capacity of prefabricated foundation could be obtained by sufficient prestress applied. Finally, the theoretical values of ultimate bearing capacity under the lateral load is determined according to theoretical deduction of limit equilibrium method, and the results of theoretical calculation are turned out to be correct comparing with the results from FEM.
Geotechnical Investigation & Surveying
wind turbine foundation
lateral bearing capacity