【摘要】 借鉴港珠澳大桥岛隧工程沉管隧道横断面结构分析方法,依托工程研究,进行运营阶段横断面分析方法及受力特征研究。得到如下结论:1)首次提出了悬浮隧道典型横断面平面应变模型边界约束方式,内力计算结果相对保守;2)横断面外轮廓曲线越光滑、棱角越小,横断面受力性能越好;3)系统划分与整理各种永久荷载、可变荷载及偶然荷载,初步研究了ULS和ALS系数取值及荷载组合;4) 20 m淹没水深净浮力作用内力包络值约为温度梯度作用的3倍,交通荷载作用的10倍;5) ULS轴力及剪力包络值大于ALS,而弯矩包络值前者小于后者。更多还原

【Abstract】 Based on HZMB Island-Tunnel Project immersed tunnel cross-section analysis method as part of the engineering study, we carried out a study on cross-section structural analysis method and internal force characteristics of submerged floating tunnel(SFT). Findings are: 1) the boundary constraint method of plain-strain model of the SFT tube typical sections is put forward for the first time, and the results of internal force calculation are relatively conservative; 2) the smoother the outer contour curve and the smaller the edge angle of the cross section, the better the mechanical performance of the cross section; 3)various type of permanent loads, variable and accidental loads are systematically divided and sorted out, and the ULS and ALS coefficients and load combinations are preliminarily studied; 4) the member force resulted from residual buoyancy acting on cross-section structure of 20 m water burial depth is approximately equal to 3 times of that of temperature gradient and 10 times of that of traffic load; 5) the ULS’s axial force and shear force envelope is larger than that of ALS’s, and the opposite applies to bending moment.更多还原