共查询到18条相似文献，搜索用时 78 毫秒
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海上平台桶形基础模型压力压贯与负压沉贯试验研究 总被引：1，自引：0，他引：1
介绍了海上平台桶形基础模型（模型桶）压力压贯和负压沉贯的试验概况,对比分析了两者贯入力的巨大差异和产生的原因,给出了模型桶压力压贯中贯入深度与压力的关系,负压没贯负压与贯入深度,抽吸泵流量,基土渗流量,桶内土塞隆起之间的关系,试验结果表明,负压沉贯可以大大降低以砂质粉土为基土的土抗力,为在胜利油田类似基土海域海上平台应用桶形基础提供了试验依据,为海上现场导管架桶形基础平台的安装就位施工和控制提供了 相似文献
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海上平台桶形基础模型负压沉贯试验数据处理与分析 总被引：1，自引：0，他引：1
海上平台桶形基础是一种新型海洋石油开发技术,其特点是利用负压将桶形基础贯入海底。本文介绍了单模型和四桶模型平台负压沉贯试验数据处理方法,对负压作用下桶形基础的沉贯过程进行了分析,探索出桶形基础平台机理现场条件下的沉贯方法。 相似文献
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海上现场试验对于桶形基础平台的沉贯安装十分重要.论述了桶形基础平台原型单桶模型在海上现场负压沉贯的方案、方法和过程,得出了试验结论,并将试验成果成功应用于CB20B采油工艺平台的海上沉贯安装,对浅水区桶形基础平台的现场施工具有指导意义. 相似文献
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海上现场试验对于桶形基础平台的沉贯安装十分重要。论述了桶形基础平台原型单桶模型在海上现场负压沉贯的方案、方法和过程,得出了试验结论,并将试验成果成功应用于ＣＢ２０Ｂ采油工艺平台的海上沉贯安装,对浅水区桶形基础平台的现场施工具有指导意义。 相似文献
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单立柱桶基平台整体结构静,动力分析 总被引：1，自引：0，他引：1
桶基平台是以桶形基础代替传统的桩基础,是海洋工程结构的一种新型基础形式,该平台是板壳和梁组成的空间结构,受力复杂,本文采用弹性抗力法解决桶形基础与土壤相互作用,用水平弹簧模拟桶基与土壤相互作用,采用板壳和梁的计算模型对平台结构进行分析,为平台的结构设计提供了依据。 相似文献
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浅海桶形基础平台水平承载力与抗滑稳定分析 总被引：1，自引：0，他引：1
平台在海上受风、浪、流、冰等水平载荷作用产生滑移,而土壤粘结力、摩擦力和土抗力是平台的抗滑力,桶基平台应满足抗滑稳定的要求,以保证平台的整体稳定性。介绍了浅海桶形基础平台受水平力作用时桶形基础的破坏模式及其计算方法,并阐述了抗滑稳定计算方法。 相似文献
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分析和描述了胜利石油管理局建成的ＣＢ２０Ｂ浅海桶基平台桶形基础结构特点,讨论了结构设计应解决的主要问题、桶形基础结构型式和尺度、桶形基础结构设计以及强度和稳定性计算。 相似文献
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介绍了桶形基础负压沉贯的室内试验,中间现场试验,应用有限元法对负压沉贯的渗流场分析,负压对桶形基础沉贯阻力的影响,对土壤特性的影响,负压大小对桶形基础沉深,沉速的影响,研究了桶形基础在海上的可行性。 相似文献
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桶形基础及其作用下的粉质土海床失稳机制研究的试验设计 总被引：1，自引：0，他引：1
在阅读、分析以往的有关资料的基础上 ,结合实际的试验条件 ,对桶形基础及其作用下的粉质土海床失稳机制研究的试验作出了专门设计。该设计通过配土、设计模型桶基和负压沉贯的操作过程、设置孔压传感器等实验手段 ,努力从土体破坏的角度 ,寻求负压沉贯过程中沉贯负压、沉贯阻力及孔隙水压力之间的变化关系和确定桶基的上拔力。并且指出了数据处理的基本思路 ,以利于课题的深入研究。 相似文献
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Calculation of Hydro-Dynamic Stability of the Soil Inside Bucket in the Process of Bucket Foundation Penetration 总被引：1，自引：0，他引：1
—The offshore platform with bucket foundations is a new type of offshore platform that distin-guishes from traditional template platforms by replacing driven piles with bucket foundations.The suctionpenentration of bucket foundation is a complicated hydro-dynamic process.The key of this process is theseepage field caused by the difference of pressure applied on purpose inside and outside the bucket.The ap-pearance and developement of seepage field has a decisive influence on the suction penetration process.Inthis study,the finite element analysis method is applied to the dynamic simulation of the seepage field ofsuction penetration of bucket foundation.A criterion is suggested to distinguish the hydro-dynamic stabili-ty of the soil inside the bucket according to the critical hydraulic gradient method.The reliability of themodel and its applicability to engineering practice have been proved through comparison between the re-sults of model test and finite element calculation. 相似文献
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海上平台桶基负压沉贯阻力与土体稳定数值计算研究 总被引：3，自引：0，他引：3
用有限元分析方法对桶形基础负压沉贯过程中流场进行动态模拟,提出桶形基础沉贯阻力计算方法和土体稳定有限计算方法,提出桶内土体稳定性判断准则,计算结果表明所提方法是合理的,并具有工程实用性。 相似文献
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海上平台桶基沉贯渗流场的有限元法数值模拟 总被引：3，自引：1，他引：2
桶形基础平台是一种新型的海洋平台,这种型式的平台与传统的导管架式平台的主要区别在于采用桶形基础代替打下桩基础,桶形基础的负压沉贯过程是一个复杂的水动力过程,其关键在于主动脉施加的桶内外压力差产生渗流场,渗流场的形成与发展对于负压沉贯有决定性的影响。本文用有限元分析方法对桶形基础负压沉贯流流场进行动态模拟,建立了桶形基础负压沉贯过程中渗流场的有限元分析模型,模型试验的结果与按有限元分析计算模型得一的 相似文献
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A shallow suction bucket is a new foundation type for offshore wind turbines. Due to its large size and bulky shape, the bucket and the soil within the bucket do not necessarily deform as a whole. Moreover, limited research has been conducted on the hydrodynamic wave influence on the shallow bucket bearing response. These factors pose great challenges to the shallow bucket foundation design. This paper presents a set of centrifuge tests of a shallow bucket model subjected to monotonic and dynamic lateral loads to study the lateral bearing response of shallow bucket foundations in the field under combined loads induced by wind, waves, etc. In addition to the routine measurements (e.g., load-displacement), the soil pressures on the bucket and the distribution and evolution of the excess pore pressures in the surrounding soils are also obtained. The deformation pattern of the bucket (e.g., rotation center) is revealed through displacement measurements. Finally, the proposed easy-to-use analytical equations using the limit equilibrium to assess the bearing capacity of bucket foundations, taking into account the influence of the soil strength degradation caused by hydrodynamic wave loadings, are found to yield good results upon comparison with the centrifuge data, providing useful guidelines for the design of shallow bucket foundations. 相似文献
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Suction buckets are a promising foundation solution for offshore wind energy systems. The bearing behavior of monopod buckets under drained monotonic loading in very dense and medium dense sand is investigated in this study by means of numerical simulation with the finite element method. Special focus is given to the ultimate capacity and the initial stiffness of the bucket-soil foundation system. The numerical model is validated by comparison with field test results. The bearing behavior of the structure is explained through an evaluation of a reference system. It is shown that the bucket experiences a heave during horizontal loading, which leads to the formation of a gap between the bucket lid and the soil with increasing load. At large loads and rotations close to failure of the system there is no contact between lid and soil, and the whole load is transferred to the soil via the bucket skirt. A parametric study shows how the ultimate capacity and initial stiffness of the system depend on the bucket dimensions and loading conditions, i.e. load eccentricity. Normalized equations for ultimate capacity and initial stiffness are derived from the numerical simulation results, which can be used in the scope of a preliminary design for buckets in sand. 相似文献