黏土中宽浅式筒型基础筒土协同承载模式研究
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摘要
宽浅式筒型基础是一种新型的海上风电基础,该基础在控制地基差异沉降方面具有巨大优势。但目前工程应用中宽浅式筒型基础的设计方法尚不成熟,一般是将筒内土体与筒视为整体,参照实体墩式基础的设计规范进行设计验算。文中基于宽浅式筒型基础大比尺模型试验,分析筒型基础在受荷过程中所受土压力的变化规律,发现只有部分筒内土体与基础协同作用。为研究筒土协同作用,提出了筒土协同度的概念,运用基于试验参数的数值模拟方法就加荷条件、筒型基础结构尺寸、筒内分仓形式、分仓板高度和厚度及筒土相对刚度等因素对筒土协同度的影响进行系统分析,并研究筒土协同度对承载力的影响,为基础结构的优化设计提供参考。
The shallow buried bucket foundation is a new type of offshore wind turbine foundation, which has the great advantage of controlling differential settlement in clay ground. But the design method of shallow buried bucket foundation is still premature at present, and the bucket and soil inside the bucket is usually taken as a whole when designing the bucket foundation. Based on bucket-soil uncooperative phenomenon and earth pressure distribution in the large scale model test, the concept of bucket-soil cooperative degree is defined. The influences of the parameters, including loading condition, dimension of bucket foundation, bucket compartment form, height and thickness of bulkheads and bucket-soil relative stiffness, on bucket-soil cooperative degree were analyzed using numerical simulation method. The influence of bucket-soil cooperation on the bearing capacity of bucket foundation was studied in order to provide reference for optimal structural design of the foundation.
The shallow buried bucket foundation is a new type of offshore wind turbine foundation, which has the great advantage of controlling differential settlement in clay ground. But the design method of shallow buried bucket foundation is still premature at present, and the bucket and soil inside the bucket is usually taken as a whole when designing the bucket foundation. Based on bucket-soil uncooperative phenomenon and earth pressure distribution in the large scale model test, the concept of bucket-soil cooperative degree is defined. The influences of the parameters, including loading condition, dimension of bucket foundation, bucket compartment form, height and thickness of bulkheads and bucket-soil relative stiffness, on bucket-soil cooperative degree were analyzed using numerical simulation method. The influence of bucket-soil cooperation on the bearing capacity of bucket foundation was studied in order to provide reference for optimal structural design of the foundation.
引文
[1]Villalobos Jara F A.Model testing of foundations for offshore wind turbines[D].London:University of Oxford,2006
[2]Barari A,Ibsen L B.Undrained response of bucket foundations to moment loading[J].Applied Ocean Research,2012,36:12-21
[3]Zafeirakos A,Gerolymos N.Bearing strength surface for bridge caisson foundations in frictional soil under combined loading[J].Acta Geotechnica,2016,11(5):1189-1208
[4]Li D,Zhang Y,Feng L,et al.Capacity of modified suction caissons in marine sand under static horizontal loading[J].Ocean Engineering,2015,102:1-16
[5]Kim S R.Evaluation of vertical and horizontal bearing capacities of bucket foundations in clay[J].Ocean Engineering,2012,52:75-82
[6]Tang X,Zhang X,Shao Q,et al.Rotation center and horizontal bearing capacity of the bucket foundation in soft ground[J].Marine Georesources&Geotechnology,2016,34(6):594-601
[7]刘润,王磊,丁红岩,等.复合加载模式下不排水饱和软黏土中宽浅式筒型基础地基承载力包络线研究[J].岩土工程学报,2014,36(1):146-154(Liu Run,Wang Lei,Ding Hongyan,et al.Failure envelopes of large-diameter shallow buried bucket foundation in undrained saturated soft clay under combined loading conditions[J].Chinese Journal of Geotechnical Engineering,2014,36(1):146-154(in Chinese))
[8]刘润,陈广思,刘禹臣,等.海上风电大直径宽浅式筒型基础抗弯特性分析[J]天津大学学报:自然科学与工程技术版,2013(5):393-400(Liu Run,Chen Guangsi,Liu Yuchen,et al.Resisting moment behavior of large diameter and shallow buried bucket foundation for offshore wind turbine[J].Journal of Tianjin University:Science and Technology,2013(5):393-400(in Chinese))
[9]闫澍旺,霍知亮,孙立强,等.海上风电机组筒型基础工作及承载特性研究[J].岩土力学,2013(7):2036-2042(Yan Shuwang,Huo Zhiliang,Sun Liqiang,et al.Study of working mechanism and bearing capacity behavior of bucket foundation for offshore wind turbine[J].Rock and Soil Mechanics,2013(7):2036-2042(in Chinese))
[2]Barari A,Ibsen L B.Undrained response of bucket foundations to moment loading[J].Applied Ocean Research,2012,36:12-21
[3]Zafeirakos A,Gerolymos N.Bearing strength surface for bridge caisson foundations in frictional soil under combined loading[J].Acta Geotechnica,2016,11(5):1189-1208
[4]Li D,Zhang Y,Feng L,et al.Capacity of modified suction caissons in marine sand under static horizontal loading[J].Ocean Engineering,2015,102:1-16
[5]Kim S R.Evaluation of vertical and horizontal bearing capacities of bucket foundations in clay[J].Ocean Engineering,2012,52:75-82
[6]Tang X,Zhang X,Shao Q,et al.Rotation center and horizontal bearing capacity of the bucket foundation in soft ground[J].Marine Georesources&Geotechnology,2016,34(6):594-601
[7]刘润,王磊,丁红岩,等.复合加载模式下不排水饱和软黏土中宽浅式筒型基础地基承载力包络线研究[J].岩土工程学报,2014,36(1):146-154(Liu Run,Wang Lei,Ding Hongyan,et al.Failure envelopes of large-diameter shallow buried bucket foundation in undrained saturated soft clay under combined loading conditions[J].Chinese Journal of Geotechnical Engineering,2014,36(1):146-154(in Chinese))
[8]刘润,陈广思,刘禹臣,等.海上风电大直径宽浅式筒型基础抗弯特性分析[J]天津大学学报:自然科学与工程技术版,2013(5):393-400(Liu Run,Chen Guangsi,Liu Yuchen,et al.Resisting moment behavior of large diameter and shallow buried bucket foundation for offshore wind turbine[J].Journal of Tianjin University:Science and Technology,2013(5):393-400(in Chinese))
[9]闫澍旺,霍知亮,孙立强,等.海上风电机组筒型基础工作及承载特性研究[J].岩土力学,2013(7):2036-2042(Yan Shuwang,Huo Zhiliang,Sun Liqiang,et al.Study of working mechanism and bearing capacity behavior of bucket foundation for offshore wind turbine[J].Rock and Soil Mechanics,2013(7):2036-2042(in Chinese))