遗留桩坑对临近复合筒型基础倾斜率的影响

EFFECT OF RESIDUAL PILE PIT ON INCLINATION OF ADJACENT COMPOSITE BUCKET FOUNDATION

针对某海上风电项目,基于ABAQUS三维数值软件定量分析桩坑与复合筒型基础的距离、桩坑尺寸及深度等参数变化对复合筒型基础结构泥面倾斜率的影响,引入可反映桩坑充盈固结程度的系数γ与切线斜率K。结果表明:随着桩坑尺寸增加,复合筒型基础泥面倾斜率呈非线性增长,且均向桩坑所在方向倾斜;桩坑深度大于复合筒型基础入土深度时,基础倾斜率增长较快;研究表明筒型基础泥面倾斜率对大深度、近距离桩坑内部土体强度尤为敏感,拟通过该文研究为复合筒型基础风电机组安装船舶选型及布置提供理论依据。

For an offshore wind power project,the influences of the distance to foundation and the size of pile pits on the inclination of composite bucket foundation at mud surface are analyzed using three-dimensional numerical software ABAQUS. The coefficient γ and sensitivity coefficient K are defined,which can reflect the filling and consolidation degree of pile pit. With the increase of pile pit size,the inclination of composite bucket foundation at mud surface is non-linearly increasing to the side of pile pit. When the depth of pile pit is greater than the penetrated depth of composite bucket foundation,the inclination increases faster. The inclination of composite bucket foundation at mud surface is more sensitive to the strength of the backfill soil inside pile pits with large depth and close distance. The research in this paper is intended to provide theoretical analyses for the selection and layout of installation vessel for composite bucket foundation and wind turbine.