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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：2，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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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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讨论了浅海桶形基础平台负压沉贯渗流场有限元分析方法.通过模型实验结果与有限元分析结果的对比,验证有限元法的可靠性.将有限元法用于桶形基础平台负压沉贯渗流场的计算,得到沉贯过程中许用负压随插深的变化,用于指导平台就位施工时的负压控制.不同插深时,相应许用负压下的桶内、外壁渗流水头和水头梯度分布的计算结果,用于沉贯阻力的计算. 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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通过对7个不同材料及大小的模型桶基在粉土中的负压沉贯实验过程中的沉贯速度、沉贯负压、桶内表层土中产生的渗流梯度和桶内土塞率的大小的比较,揭示了比尺不同的桶基对贯入过程的影响,为桶基设计和施工提供依据。 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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A concept design, named integrated suction foundation, is proposed for a tension leg platform (TLP) in deep ocean. The most important improvement in comparing with the traditional one is that a pressure-resistant storage module is designed. It utilizes the high hydrostatic pressure in deep ocean to drive water into the module to generate negative pressure for bucket suction. This work aims to further approve the feasibility of the concept design in the aspect of penetration installation and the uplift force in-place. Seepage is generated during suction penetration, and can have both positive and negative effects on penetration process. To study the effect of seepage on the penetration process of the integrated suction foundation, finite element analysis (FEA) is carried out in this work. In particular, an improved methodology to calculate the penetration resistance is proposed for the integrated suction foundation with respect to the reduction factor of penetration resistance. The maximum allowable negative pressure during suction penetration is calculated with the critical hydraulic gradient method through FEA. The simulation results of the penetration process show that the integrated suction foundation can be installed safely. Moreover, the uplift resistance of the integrated suction foundation is calculated and the feasibility of the integrated suction foundation working on-site is verified. In all, the analysis in this work further approves the feasibility of the integrated suction foundation for TLPs in deep ocean applications. 相似文献
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论述了桶形基础负压沉贯在海上试验的方案,方法和过程,以及各种试验数据的取得方法,对桶型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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Under the effect of eccentric loads,when the suction pressure of the composite bucket foundation is leveled,the seepage failure is very easy to occur.The seepage failure occurrence causes the foundation to settle unevenly and impairs the bearing performance.This study uses ABAQUS finite element software to establish a composite bucket foundation model for finite element analysis.The model simulates the seepage of the foundation penetrating process under eccentric load to reveal the induced seepage characteristics of the bucket foundation.The most vulnerable position of seepage failure under the eccentric loading is elucidated.Critical suction formulas for different offset eccentric moment strategies are derived and compared with existing literature formulas.Then the derived formula is supplemented and corrected according to the pressure difference between adjacent cabins.Conclusions can be drawn:(1)Under eccentric loads,the critical suction decreases about 7%?10%.(2)The pressure difference between adjacent cabins impacts significantly on the seepage field,and the critical suction,at most,can be reduced by 17.56%.(3)the offset strategies have little effect on the seepage field.Efficient and appropriate strategies can be selected to meet the requirement of leveling in engineering project. 相似文献
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桶形基础采用负压沉贯法施工 ,与压桩、打桩等施工方法显著不同 ,且阻力特性受地基性质影响很大。介绍了一组粉土地基条件下的模型试验情况 ,探索了桶形基础的沉贯阻力与负压、渗流等的关系 ,并与实际平台沉贯过程进行了对比。 相似文献
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桶形基础平台负压沉贯遥测遥控技术方案设计 总被引：1，自引：0，他引：1
桶形基础平台海上安装就位在施工方法与传统的桩基平台截然不同,本文介绍了一种桶形基础平台负夺沉贯施工的遥测遥控系统方案,对现场施工机具的设计参考作用。 相似文献
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吸力式导管架基础具备高承载力、高施工效率、高环境友好度、低造价等特点,使用其作为海上风电底部支撑结构有利于产业的规模化发展,实现上述愿景的前提在于使筒型基础顺利安装以满足设计要求。基于此,在不同初始施加泵压下,对吸力式导管架的沉贯效率特征值、基础内外围渗流变化、筒裙端部土压力特点进行探究。通过抱桩器使吸力式导管架在吸力安装过程中仅具备竖向自由度,从而进行纯沉贯试验。结果表明：初始泵压2 kPa时沉贯效率特征值最高;沉贯过程中基础外围渗流水压小于基础内围渗流水压;筒裙外侧所受土压要大于筒壁内侧所受土压力。 相似文献