摘要
吸力筒沉贯特性是影响其工程应用的重要因素。基于海上风电场吸力筒导管架基础筒体下沉过程的实测数据,研究真实海床地基条件下吸力筒沉贯阻力的CPT计算方法的可行性以及DNV规范推荐的土体沉贯阻力的经验系数的适用性,分析黏土层和砂土层中沉贯阻力的组成和负压下沉过程中的筒内土塞机制。研究结果表明:CPT计算方法能够较精确地计算吸力筒沉贯阻力,DNV规范推荐的经验系数高估了海床地基中淤泥质土、粉质黏土层的黏土经验系数k_(f)(z)以及砂砾、中砂、粗砂层等砂土经验系数k_(p)(z);负压下沉过程中,筒内土塞体积的发展规律与海床土层分布及土体物理力学性质密切相关。
The penetration behavior of suction bucket foundations has a significant effect on engineering application.Based on the measured installation data of two suction bucket jacket foundations in an offshore wind farm,the CPT-based method used for calculating the penetration resistance in seabed and the two critical empirical factors,k_(p)(z)and k_(f)(z),recommended by the DNV code are studied.The component of penetration resistance of suction bucket in clay soil layer and sand soil layer,respectively,and the soil plug during suction penetration process are analyzed.The results show that the penetration resistance of suction bucket can be precisely predicted by the CPT-based method.The empirical factor k_(f)(z)for silty soil,silty clay soil and the empirical factor k_(p)(z)for grit sand,medium-dense sand and coarse sand are overestimated by the DNV code.During suction penetration process,the soil plug of suction bucket foundations relies on the seabed soil layers and mechanical properties of soils.
作者
王卫
刘俊峰
李亚静
倪道俊
滕华灯
黄绍幸
WANG Wei;LIU Junfeng;LI Yajing;NI Daojun;TENG Huadeng;HUANG Shaoxing(Institute of Science and Technology,China Three Gorges Corporation,Beijing 100038,China;Three Gorges Renewables Yangjiang Power Co.,Ltd.,Yangjiang 529500,China;China Three Gorges Renewables(Group)Co.,Ltd.,Beijing 100053,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2024年第3期655-661,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(52209171)
中国长江三峡集团有限公司科研项目(WWKY-2020-0179)。
关键词
海上风电
吸力筒基础
沉贯特性
土塞
offshore wind power
suction bucket foundation
penetration behavior
soil plug
