考虑锚胫作用下拖曳锚在成层土中的嵌入机制  

Embedment mechanism of a drag anchor in layered soils considering shank effect

作　　者：熊树森 黄蕴晗 赖莹 XIONG Shu-sen;HUANG Yun-han;LAI Ying(Center for Hypergravity Experimental and Interdisciplinary Research,Zhejiang University,Hangzhou,Zhejiang 310058,China;College of Civil and Harbor Engineering,Jiangsu Ocean University,Lianyungang,Jiangsu 222002,China;College of Civil Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China)

机构地区：[1]浙江大学超重力研究中心,浙江杭州310058 [2]江苏海洋大学土木与港海工程学院,江苏连云港222002 [3]浙江大学建筑工程学院,浙江杭州310058

出　　处：《岩土力学》2024年第5期1495-1504,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52279112)。

摘　　要：深水系泊系统及其系泊基础的开发已成为发展清洁能源“海上风电”项目的关键课题。拖曳锚由于其较大的承载力和易安装等诸多优势而具有较好的发展前景。基于极限塑性上限分析法,建立了考虑锚胫作用的拖曳锚在成层土中的嵌入轨迹、姿态以及承载力预测模型。利用已有模型试验对本模型进行验证,结果表明:考虑锚胫作用模型轨迹预测误差控制在13.5%,轨迹和角度预测误差相比于未考虑锚胫作用的模型分别降低了78.32%和36.9%。硬土层的强度、厚度和深度共同制约着拖曳锚的嵌入能力。首先,强度比影响最明显,强度比越大,嵌入深度越小,直至无法穿透硬土层;其次,是深度影响,深度越大,承载力越大。能够穿透硬土层的条件下深度对轨迹和角度影响不明显,不能够穿透硬土层条件下深度越大,嵌入深度越大,最终角度越小;最后,是厚度影响,硬土层厚度越大,嵌入过程中承载力越大。The development of deep water mooring system and its mooring foundation has become a key issue in the development of clean energy"offshore wind power"projects.The drag embedment anchor,owing to its high bearing capacity and ease of installation,presents promising prospects.A prediction model for the trajectory,pitch angle and capacity of the anchor in layered soil,considering the effect of shank,is established based on the upper limit analysis.Verification of the model using existing model tests demonstrates that the trajectory prediction error of the model,accounting for the shank effect is limited to 13.5%.Furthermore,compared with the model that does not consider the shank effect,the trajectory and angle prediction error are reduced by 78.32%and 36.9%respectively.The strength,thickness and depth of stiff layer jointly restrict the embedding capability of the anchor.The influence of strength is found to be the most significant,with a higher strength ratio leading to a shallower embedding depth until the stiff layer becomes impenetrable.Additionally,greater depth is associated with increased bearing capacity.When the stiff layer can be penetrated,depth has minimal impact on trajectory and angle.However,when the stiff layer cannot be penetrated,the greater depth will result in a deeper embedment depth and smaller final angle.Lastly,the thickness of the stiff layer is found to positively correlate with the bearing capacity during the embedding process.

关 键 词：拖曳锚 预测模型 成层土 锚胫作用 轨迹 

分 类 号：TU452[建筑科学—岩土工程]