软土地基上高速公路双侧加宽工程的数值分析

采用有限元软件ABAQUS分析了双侧加宽时新路堤作为附加荷载对老路堤和地基的影响。分析表明，加宽荷载作用下，施工期老路堤沉降呈倒钟形分布，水平位移指向道路的外侧；加宽后新老路堤表面沉降为马鞍型分布，水平位移指向道路的内侧，并且水平位移和沉降均随加宽宽度增加而变大。另外，对超孔隙水压力的分析表明，新路堤下方软基中出现了高孔压区，最大值随新路堤加宽宽度增加而增加。最后，提出了加宽工程的控制指标。

Numerical Analysis of Expressway Widened with Two Sides on Soft Soil Foundation

The effects of two sides widening of new embankment on the old pavement and subgrade are analyzed with ABAQUS software.It's found that the cross section settlements of the old embankment present a reversed bell distribution and it's horizontal displacements point outside the road during widening.After construction,the old and new embankments present the shape of saddle and have(horizontal) displacements pointing inside the road.Moreover,the settlements and horizontal displacements as well as the excess pore(pressures) in soft foundation increase with the increase of the new embankment width,and the excess pore(pressures) achieve the(maximum) in the soft foundation under the new embankment.Finally,the control indexes of wendening project are built.