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

Abstract: 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-Macau 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.

Key words: steel cylinder structure, local stream line curving, additional assistance, two-dimensions finite element program on horizontal plane