摘要
漂浮式结构是深远海资源开发中的重要结构形式,与之通过锚链相连的锚固基础是保证其在位安全稳定的关键部分。板锚是目前常用的锚固基础形式之一,在其服役过程中会受到风、浪、流等诱发的往复荷载作用。目前,有关板锚在往复荷载作用下承载性能的研究结论存在相悖之处,其承载机理还未明晰,有待进一步开展深入系统的研究。为此,利用双自由度伺服加载系统,在饱和黏土中针对平板锚开展了往复拉拔试验,研究了往复荷载中值和幅值对板锚承载性能的影响。结果表明,随往复荷载中值和幅值的增加,板锚的承载力先提高后降低;当往复荷载的中值和幅值取值为单调抗拔极限承载力的28%±18%时,板锚的承载力提升最大,比单调抗拔极限承载力提升了10.44%;当往复荷载达到单调抗拔极限承载力的60%±18%时,土体发生严重破坏,板锚失去承载能力。依据板锚在往复荷载作用后的承载性能,为板锚服役期间的安全性评估提供了指导。
Floating structure is an important structure form in the development of far-reaching Marine resources.The anchor foundation connected with it by anchor chain is the key part to ensure its security and stability in place.Plate anchor is one of the common anchorage foundation forms at present,and it will be subjected to the repeated loading induced by wind,wave and current during its service.At present,the research conclusions on the bearing performance of plate anchors under repeated loading is inconsistent,and the bearing mechanism is not clear,which needs to be further carried out in-depth and systematic research.In this paper,a two-degree-of-freedom servo loading system was used to carry out a reciprocating drawing experiment on a plate anchor in saturated clay,and the influence of the median and amplitude of repeated loading on the bearing performance of plate anchor was studied.The results show that with the increase of median and amplitude of repeated loading,the bearing capacity of plate anchor first increases and then decreases.When the median and amplitude of repeated loading is 28%±18%of the monotonic ultimate pulling capacity,the bearing capacity of plate anchor increases the most,which is 10.44%higher than that of monotonic ultimate pulling capacity.When the repeated loading is 60%±18%of the monotonic ultimate pulling capacity,the soil mass is seriously damaged and the plate anchor loses its bearing capacity.According to the change of bearing capacity of plate anchor after repeated loading,it provides guidance for the safety evaluation of plate anchor during service.
作者
孙一飞
王乐
张庭冉
张春会
田英辉
SUN Yifei;WANG Le;ZHANG Tingran;ZHANG Chunhui;TIAN Yinghui(School of Civil Engineering,Tianjin University,Tianjin 300350,China;State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin 300350,China;School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Department of Infrastructure Engineering,The University of Melbourne,Melbourne 3010,Australia)
出处
《岩土工程学报》
北大核心
2025年第3期659-666,共8页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金面上项目(51879183)
国家自然科学基金重大项目(51890913)。
关键词
往复荷载
极限承载力
方形板锚
黏土
repeated loading
ultimate bearing capacity
square plate anchor
clay
