重庆某道路工程高填方段变形与稳定分析

Deformation and Stability Analysis for Highfill of a Road Project in Chongqing

以重庆市合川区涪江四桥工程高填方路段为研究背景,利用PLAXIS有限元分析软件,探讨了该高填方路基的变形规律,并对路堤施工过程中的稳定性进行评价.研究结果表明:与一般较为平坦地面上的路基相比,斜坡上的路基有着不同的沉降特征,表现为沿着路堤中心线呈非对称性,并且为非线性变化,最大竖向沉降发生在靠近左侧路肩位置,侧向最大沉降则发生在路堤中间部分;水平方向来看,地基土受影响发生沉降的区域主要局限在路堤底部范围内,而竖向最深则到达粉质粘土层,泥岩层基本上没有发生变形;随着施工高度的增加,路基的稳定安全系数有所减少;填筑过程中铺设土工格栅对路堤整体性能的改善起到了良好的作用.

With the background of Fujiang four bridges highfill in Chongqing hechuan district , finite ele-ment analysis software PLAXIS was used to study the deformation rules of the highfill and evaluate the stability in the construction progress .It is showed that subgrade on inclined ground presents different settlement characteris-tics compare to the general subgrade on flat ground , including that appearing asymmetry and nonlinearity along two sides of embankment center line , the maximal vertical settlement appears near left road shoulder , and the maximal lateral settlement appears in the middle part of embankment;in horizontal direction , the effected settle-ment part of ground soils mainly confined to embankment base , while in the vertical direction maximal depth ar-rives to silt clay , and mud rock does not appear settlement;the whole safety factor of subgrade decreases with the increase of filling height;the whole properties of subgrade can be improved effectively with by reinforcement with geogrid in construction progress .