地震荷载作用下筒型基础对砂土抗液化性能的影响分析

为给近海风电筒型基础的抗震设计提供参考,通过数值模拟软件FLAC 3D,分析地震荷载作用下筒型基础对土体抗液化性能的影响。重点研究筒型基础内部及周围土体的孔隙水压力、竖向沉降和总应力的变化规律。结果表明:筒型基础顶面竖向荷载的施加以及筒壁侧向环箍效应有利于提高土体抗液化性能;土体沉降与地震作用时间及地震波波动峰值相关,地震作用后筒内顶部土体沉降量最大。

Analysis of Influence of Bucket Foundation on Liquefaction Resistance of Sandy Soil Under Seismic Load

In order to provide reference for the seismic design of bucket foundation for offshore wind turbine, the influence of the bucket foundation on the liquefaction resistance of the soil under the seismic load is analyzed by the numerical simulation software FLAC 3D. The changes of pore water pressure, vertical settlement and total stress in the soil inside and around the bucket foundation are studied. The research shows that the application of the vertical load on the top surface of the bucket foundation and the lateral hoop effect of the bucket wall are beneficial to improve the liquefaction resistance of the soil. The settlement of the soil is related to the seismic action time and the peak value of the seismic wave fluctuation. After the earthquake, the soil settlement at the top of the bucket is the largest.