选取大连海域某风电场吸力桶导管架实际案例,监测沉放过程中的桶体压力、沉放速度等关键参数,与挪威船级社（DNV）相关规范的计算值进行对比分析,得出在粉质黏土沉放过程中阻力、压力、速度的关系和特点。研究结果表明,DNV规范计算的桶体静力自沉入泥深度较为准确;负压沉放的桶内实际负压驱动力变化呈现增加—平稳—增加3个阶段,负压平稳阶段占据主要部分;负压沉放初期的实际负压驱动力大于计算值,随后持续小于计算值;持续的负压动态沉放可在一定程度上减小贯入阻力,吸力桶导管架实际沉放作业中应尽量连续贯入;最终沉放负压驱动力实际值小于计算值,约为计算值的76.0%;负压沉放速度呈现先迅速增加、随后减小至较小平稳速度持续贯入的特点。
Abstract
This study selects an actual case of a suction bucket jacket in a wind farm in the Dalian sea area,monitor key parameters such as the bucket pressure and velocity during the penetration process,and compares and analyzes them with the calculated values of DNV calculation to obtain the relationship and characteristics of resistance, pressure,and velocity during the penetration process in silty clay. The research results indicate that the DNV calculation of self-weight penetration depth into the soil is relatively accurate. The change of actual driving suction force inside the bucket shows three stages： increase,stability,and increase,with the stability stage accounting for the main part. The actual driving suction force during the initial stage of suction penetration is greater than the calculated value,and then continues to be lower than the calculated value. Continuous dynamic suction penetration can reduce the resistance to a certain extent. The suction bucket jacket should be continuously penetrated as much as possible during the actual operation The actual driving suction force of the final penetration is less than the calculated value,about 76.0% of the calculated value in silty clay. The suction penetration velocity shows a characteristic of rapid increase at first,followed by a decrease to a smaller stable velocity for continuous penetration.
关键词
海上风电 /
吸力桶 /
负压驱动力 /
沉放阻力 /
负压沉放 /
静力沉放
Key words
offshore wind turbines /
suction bucket /
driving suction force /
penetration resistance /
suction penetration /
self-weight penetration
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