Lateral bearing behaviors of offshore wind turbine monopile foundation considering local scour
In the current design process of offshore wind turbine monopile foundations,the shape of the local scour pit is usually ignored and directly simplified to the global scour,which leads to a conservative design of monopile foundations.A hyperbolic p-y curve for large-diameter monopiles was adopted to construct the pile-soil interaction model.The concept of equivalent depth was introduced and modified to establish a simplified one-dimensional monopile analysis model considering the shape of scour pit based on available centrifuge test data currently.The rationality of the proposed model is verified by comparison with the test results.Furthermore,several modified models were compared and analyzed,and the prediction effects of each model on the lateral response of monopile foundations subjected to local scour were discussed.The results of the study show that the local scour mainly leads to the reduction of the soil resistance along pile in the shallow range of seabed,so a reasonable correction of the p-y curve of shallow soil is the key to the analysis of lateral response for monopile subjected to scour.Because the existing models underestimate the effective vertical geo-stress of shallow soil after local scour,whose prediction results of lateral responses of monopile are closer to those of the global scour model.
local scourmonopile foundationp-y curvelateral bearing behaviors
万方数据
维普
