摘要
钢圆筒结构在国内外港口、跨海桥梁等工程中应用,但对钢圆筒结构渗流分析的方法依然不多.钢圆筒结构渗流分为缝隙渗流与接头渗漏,为解决钢圆筒结构缝隙渗流中局部流线弯曲引起的水头损失增加的计算,引入附加阻力概念,将增加的水头损失用弱透水层进行等效,即可在平面应变条件下进行计算;接头渗漏区域引入附加阻力概念进行等效计算,发现缝隙尺寸的大小对弱透水层渗透系数的影响不大,当缝隙尺寸增大400倍时,等效渗透系数仅增加1.6倍,渗流计算中可认为接头缝隙不透水.采用该等效方法利用水平面二维有限元程序对港珠澳大桥西人工岛钢圆筒结构进行渗流分析,通过与三维数值计算进行对比,计算结果相近.
The steel cylinder structure has been widely used in sea-crossing bridges and port project,but hardly any methods exist for evaluation of seepage analysis of the structure. The seepage of the steel cylinder structure relies on two parts,consisting of gap seepage and joints seepage. For the sake of analyzing increase in the head loss caused by the curve of local stream line in gap seepage of the steel cylinder structure,the calculation can be accessed under plane strain condition by introducing the concept of the extra seepage and theorizing the increase in the head loss to a low-permeability layer. In this assessment for analyzing joints seepage,the joints size was not found to be linked to the equivalent permeability coefficient,and joints gap can be seen as impervious while expanding the joints size of 400 times would just increase the equivalent permeability coefficient of 1. 6 times comparing to the original data. It is apparent that the method worked well for seepage analysis of the Hong Kong-Zhuhai-Macao bridge project,because the result of the assessment method,which uses the two-dimension finite element program on horizontal plane for analyzing,has been successfully demonstrated by comparing to 3D numerical calculation.
出处
《冰川冻土》
CSCD
北大核心
2016年第4期909-914,共6页
Journal of Glaciology and Geocryology
基金
国家科技支撑计划项目(2011BAG07B02)资助
关键词
钢圆筒结构
局部流线弯曲
附加阻力
水平面二维有限元
steel cylinder structure
local stream line curving
additional assistance
two-dimensions finite element program on horizontal plane
