闫澍旺, 霍知亮, 楚剑, 郭伟. 黏土中负压桶形基础下沉与承载特性试验及有限元分析研究[J]. 工程力学, 2016, 33(1): 122-132. DOI: 10.6052/j.issn.1000-4750.2014.05.0465
引用本文: 闫澍旺, 霍知亮, 楚剑, 郭伟. 黏土中负压桶形基础下沉与承载特性试验及有限元分析研究[J]. 工程力学, 2016, 33(1): 122-132. DOI: 10.6052/j.issn.1000-4750.2014.05.0465
YAN Shu-wang, HUO Zhi-liang, CHU Jian, GUO Wei. TEST AND FEA OF INSTALLATION AND AXIAL BEHAVIOR OF SUCTION CAISSON IN CLAY[J]. Engineering Mechanics, 2016, 33(1): 122-132. DOI: 10.6052/j.issn.1000-4750.2014.05.0465
Citation: YAN Shu-wang, HUO Zhi-liang, CHU Jian, GUO Wei. TEST AND FEA OF INSTALLATION AND AXIAL BEHAVIOR OF SUCTION CAISSON IN CLAY[J]. Engineering Mechanics, 2016, 33(1): 122-132. DOI: 10.6052/j.issn.1000-4750.2014.05.0465

黏土中负压桶形基础下沉与承载特性试验及有限元分析研究

TEST AND FEA OF INSTALLATION AND AXIAL BEHAVIOR OF SUCTION CAISSON IN CLAY

  • 摘要: 负压桶形基础是一种适宜于软土地基上的新型港口水工建筑物,在深海区域静水压力有助于桶形基础压入至海床内预定深度而完成安装,而在水深较浅的滩海则可能出现负压不足、土塞等作用影响桶形基础下沉,导致承载力不能满足设计要求等问题。此外对于桶形基础竖向承载力的计算没有现成的规范可参考,桶裙、顶板的荷载承担特性,桶土相互作用等问题也鲜有研究。因此,通过室内模型试验研究黏土中不同负压下桶形基础的下沉特性和竖向承载能力,分析下沉负压与土塞的关系,提出软黏土中桶形基础下沉就位的工程措施。并通过试验结果验证的有限元计算模型,研究竖向荷载作用下桶形基础竖向承载特性,得出适用于桶形基础竖向承载力的计算方法,为桶形基础竖向承载力的设计与计算提供依据。

     

    Abstract: Suction caissons have mainly been used as foundations to support offshore structures in deep water. As the suction used to install suction caissons is dependent on water depth, their applications in shallow water are more challenging as there is less suction force that can be used to install the caissons. Unfortunately, there have been no standards for suction caisson bearing capacity design up to now. Additionally, the issues of caisson-soil interaction and each caisson parts bearing behaviors have been rarely investigated. In this paper, efforts were made to investigate suction caissons as a type of foundation for underwater structures. Model tests were carried out to study the behavior of a suction caisson installed in different types of consolidated soils. The suction effect on the soil inside the caisson (i.e., soil plugs) was also investigated. Engineering measures were suggested for caisson installation in clay. Based on the FEM, 3D numerical analysis is performed to simulate the working mechanism and evaluate the bearing capacity behavior of a suction caisson, on the basis of which a calculation method is presented for caisson vertical bearing capacity. The conclusions can provide references for caisson bearing capacity design.

     

/

返回文章
返回