含斜坡软弱夹层的路堤填筑过程数值模拟

摘要

基于拉格朗日差分方法，并结合现场类似地形的实测数据，研究了含斜坡软弱夹层的地基在路堤分层填筑的过程竖向及水平向位移的规律。分析表明，倾斜地基的水平向位移沿倾斜方向发展，变形明显，影响区域很广，地基的不均匀沉降情况严重，影响了路堤稳定性。由于表层硬壳层的作用，有效地限制了位移的发展，使得整体情况相对改善很多。数值模拟结果与现场实测数据吻合，为进一步研究该类软土地形提供有力的理论依据。%Law of lateral and vertical displacement on subgrade embankment of sloping ground with weak interlayer was studied by Lagrangian analysis and the measured data which were measured on similar terrain. It is shown that the lateral displacement extended toward the direction of the slope. The deformation was obvious and affected a wide area. Also the situation of uneven settlement was serious which both affected the stability of the slope. Due to the role of the mantle layer on the surface,the displacement was limited and the overall situation was improved. The results of the numerical simulation and the measured data were identical,which provided a theory basis for this kind of terrain.