深厚软基高速公路拓宽新老路堤相互作用分析

深厚软基上的高速公路拓宽时,新老路堤之间存在复杂的相互作用.本文采用数值方法分析了拓宽时间对新老路堤差异沉降、路面面层应力及路面横坡比的影响.研究结果表明:深厚软基高速公路拓宽前,老路堤的沉降随着时间逐渐增大,最后趋于稳定；软土渗透系数小,因此拓宽前老路堤运行时间越久,软基中的超静孔隙水压力消散越充分,拓宽路堤对老路堤...

Analysis of Interaction between Existing and Widened Embankments of Highway over Softsoils

When the highway widens on the deep soft soil,there are complex interactions between the existing and widened embankments.Numerical methods are employed to analyze the influence of widened time on differential settlement of the existing and widened embankments and surface stress of embankment as well as the transversal slope of the existing embankment.The results indicate that before widening of highway over soft soil,the settlement of existing embankment gradually increased with time,and finally stabilized.Due to that the permeable coefficient of soft soil is small,so the longer the old embankment runs before widening,the better excess pore water pressure of soft soil dissipates,the widening embankment has less influence on the existing embankment,and the differential settlement of widened and existing embankment is smaller.After a long time of operation,the widening of the existing embankment can cut down the surface stress of existing and widened embankment to a certain extent,to avoid cracking on the surface of embankment,After the widening,the transversal slope of the existing embankment is cut down over time and there is a significant phenomenon of reverse slope.Results of this article may provide a useful reference for the similar engineering design and construction.