摘要
吸力式基础作为一种新兴的海洋锚泊基础,具有运输便捷、施工快、节省材料等优点。但吸力式基础在复杂多变的海洋环境以及海床地质条件贯入过程中易发生倾斜,严重影响自身的承载功能。本文针对海底吸力式基础的沉贯倾斜问题,展开一系列试验,采用振动减阻原理达到纠偏效果。试验分别研究了在不同振动频率、不同初始倾斜角、不同静压荷载作用下的基础纠偏过程。结果表明,倾斜的吸力式基础可通过侧壁振动方式实现有效纠偏,其纠偏效果与振动频率、初始倾斜角以及静压荷载息息相关:相同激振力作用下,激振频率越大(25～75 Hz),所需纠偏时间越短;桶基的初始倾斜角越大,则完全纠偏所需时间越长,且呈非线性增加;贯入荷载(或贯入深度)越大,纠偏难度越大,纠偏越早(贯入深度越小)越容易。
The suction foundation,as a new type of anchor foundation,has the advantage of convenient transportation,rapid construction and material saving.However,there are many problems related to vertical installation of suction buckets due to the complex ocean wave current and seabed geological conditions,which may cause the decrease of bearing capacity of the suction buckets after inclined installation.In this paper,a series of experiments are conducted to model the leaning process of the suction foundations,and to verify the righting rate of the leaning buckets by exerting resistance-reduce vibration on local side walls(RRV-LSW)under different conditions of the vibration loading frequency,the initial leaning angle of the bucket and the suction loading.The experiment results show that the method of RRV-LSW is satisfactory to upright the leaning buckets during penetrating process,and its performance is closely relative to the vibration loading frequencies,initial leaning angles and equivalent loading.Within the range of 25-75Hz,the higher frequency of the vibration loading has a higher righting rate when exerting same value of the vibration force.The required time to upright the leaning bucket increases nonlinearly with the increase of the leaning angle of the bucket.The difficulty of uprighting the leaning bucket is higher when the suction loading(or the buried depth of buckets)is larger,which reminds that it is better to upright the leaning bucket as early as possible.
作者
谢立全
林田田
Xie Liquan;Lin Tiantian(College of Civil Engineering,Tongji University,Shanghai 200091)
出处
《高技术通讯》
EI
CAS
北大核心
2019年第1期53-59,共7页
Chinese High Technology Letters
基金
国家自然科学基金(51479137)资助项目
关键词
吸力式基础
倾斜
振动
纠偏
频率
suction foundation
inclination
vibration
rectification
frequency
