软土地基上高速公路加宽工程的数值分析

Numerical Analysis of Road Widening Project on Soft Soil Ground

采用有限元软件ABAQUS分析了新路堤作为附加荷载对老路堤和地基的影响。分析结果表明,加宽后老路的稳定性增强;地基中心的沉降量和沉降速率增加;老路堤横断面沉降由弯沉盆状变成了反盆状,新老路堤之间产生了差异沉降,为马鞍型分布,且最大值发生在新路堤形心位置处;同时,对水平位移和地基中超孔隙水压力的考察发现,新老路堤交界处水平位移方向发生了改变,由向道路内侧的位移变为了向外的位移,并且此处的超孔隙水压力最大,表明老路肩处地基稳定性最差,而整个地基在新路面结构施工后稳定性最差。

The effects of new embankment on old pavement are analyzed with FEM program ABAQUS. It＇ s found that the stability of the old pavement is enhanced and the seulement and its speed are increased. In addition, the shape of cross section settlement of the old embankment changed to reversed deflection basin. Saddle shaped differential settlement is found between the old and new embankment and its maximum is in the centroid of the new embankment. Finally, the study of horizontal displacement and excess pore water pressure indicates that the direction of the horizontal displacement is reversed in the joints of the old and new embankment and the excess pore water pressure achieves its maximum in this place, which indicates that the stability of subgrade under the old pavement shoulder is the worst and the stability of the subgrade is the worst after the construction of the new pavement structure.