| 海床表层软土对宽浅式筒型基础承载特性影响研究 |
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| 引用本文： | 练继建,翁珮瑶,郭耀华,王海军,杨旭.海床表层软土对宽浅式筒型基础承载特性影响研究[J].海洋工程,2022,40(3):1-9. |
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| 作者姓名： | 练继建 翁珮瑶 郭耀华 王海军 杨旭 |
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| 作者单位： | 天津大学 水利工程仿真与安全国家重点实验室,天津 300072;天津大学 建筑工程学院,天津 300072;河北工程大学 水利水电学院,河北 邯郸 056038,天津大学 建筑工程学院,天津 300072,天津大学 水利工程仿真与安全国家重点实验室,天津 300072;天津大学 建筑工程学院,天津 300072 |
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| 基金项目： | 国家自然科学基金资助项目(51909188) |
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| 摘 要： | 近海海床表层多为软黏土或淤泥质土,为探究海床表层软土对海上风电宽浅式筒型基础承载特性的影响,以中国广东某海域风电场为背景,通过有限元分析的方法,研究竖向、水平、弯矩荷载作用下软土层厚度和土体强度对基础极限承载力、破坏模式以及筒基土压力分布的影响。研究结果表明:当软土层厚度小于H/2(H为筒裙高度)时,单向荷载作用下宽浅式筒型基础极限承载力随软土层厚度的增加呈线性减小的趋势;当软土层厚度大于H/2后,承载力降低速率逐渐增大。表层软土的存在,使得塑性区范围缩小,软土层内土体塑性破坏更加明显。竖向荷载作用下,随软土层厚度的增大,筒顶承载先减小后增大,筒内侧摩阻力先增大后减小;水平荷载和弯矩作用下,筒侧被动土压力的降低是引起软土覆盖地基中基础承载能力降低的主要因素。
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| 关 键 词： | 宽浅式筒型基础 表层软土 极限承载力 地基破坏模式 土压力 |
| 收稿时间： | 2021/6/24 0:00:00 |
Influence of soft top soil on bearing capacity of wide-shallow bucket foundation for offshore wind turbines |
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| LIAN Jijian,WENG Peiyao,GUO Yaohua,WANG Haijun,YANG Xu.Influence of soft top soil on bearing capacity of wide-shallow bucket foundation for offshore wind turbines[J].Ocean Engineering,2022,40(3):1-9. |
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| Authors: | LIAN Jijian WENG Peiyao GUO Yaohua WANG Haijun YANG Xu |
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| Institution: | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;School of Civil Engineering, Tianjin University, Tianjin 300072, China;School of Water Conservancy and Hydropower Engineering, Hebei University of Engineering, Handan 056038, China |
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| Abstract: | The offshore seabed typically consists of a layer of soft clay or silt. To study the effect of soft top soil on the bearing capacity of the wide-shallow bucket foundation for offshore wind turbines, taking a wind farm in Guangdong, China as the background, ultimate bearing capacity, failure mode and distribution of soil pressure in soft top soil of varying thickness and strength under vertical, horizontal and bending moments are investigated through finite element simulation. The results show that when the thickness of the top layer is less than H/2(H is the bucket height), the ultimate bearing capacity of the wide-shallow bucket foundation linearly decreases with the increasing thickness of the soft top soil. When the thickness of the top layer is greater than H/2, the reduction rate increases. Affected by the soft layer, the plastic collapse area of the soil decreases and the plastic failure in soft top soil becomes more obvious. Under the vertical load, the bucket-top bearing capacity decreases first and then increases with the increasing top soil thickness, exactly opposite to that of the bucket side. Under horizontal load and bending moment, the decrease of passive soil pressure on the bucket side is the main factor that causes the reduction in bearing capacity. |
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| Keywords: | wide-shallow bucket foundation soft top soil ultimate bearing capacity failure mode soil pressure |
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