【摘要】 针对框架桥下穿既有铁路对路基的沉降影响问题,文章采用ABAQUS有限元软件建立二维模型,分析了不同埋深、不同框架桥高宽比条件下地表沉降曲线形态,研究了框架桥下穿既有铁路路基沉降控制标准计算方法。研究结果表明:框架桥下穿既有线路基沉降曲线也可用PeckB公式进行拟合;根据i与■呈线性关系对沉降槽宽度系数进行修正使其更适合于浅埋大跨度箱涵下穿路基沉降的计算;基于铁路轨道平顺性控制要求所提出的路基沉降控制标准考虑了框架桥截面宽度、埋深以及土体内摩擦角因素,具有易用性。更多还原

【Abstract】 In view of impact on subgrade settlement induced by a frame bridge passing underneath a existing railway, a 2D numerical simulation model was established by ABAQUS software to analyze the patterns of ground settlement curves under different buried depths and different ratios of height and width, to study the calculation methodfor controlling criterion of subgrade settlement caused by a frame bridge underneath a existing railway, with the re-sults showing that the subgrade settlement curves can be fitted by Peck formula; the coefficient of settlement trough width is corrected considering the linear relationship between i and ■; the proposed subgrade settlement control criterion based on the requirements of track regularity control considers the cross-section width of the frame bridge, buried depth and internal angle of soil mass.更多还原