高速公路拓宽新路基差异沉降计算分析

高速公路拓宽过程中,由于新老路基固结程度不同,路面荷载作用下新填路基会产生较大沉降,导致路面破坏;甚至会引发交通事故。基于土的孔隙介质特性,考虑路基边坡对路基沉降的影响,采用修正的分层总和法和ABAQUS数值模拟来计算新填路基路面沉降规律。计算结果表明修正的计算方法得出的路面沉降曲线与实际现场观测结果有明显的相似性,能够比较准确地反映路面不同位置的变形规律,可用于软土路基沉降计算及预测预报,为路基工程设计施工提供参考。

COMPUTATIONAL ANALYSIS OF DIFFERENTIALSETTLEMENT ON NEWSUBGRADE IN EXPRESSWAYWIDENING

In the process of highway widening, the new and the existing subgrades consolidation degree is different, under the load the new subgrades will produce a large settlement, it lead the road damage and even cause accidents. Based on the porous media characteristics of soil, consider the effect of subgrade slope on pavement settlement, using the revising layer wise summation method and the numerical simulation of ABAQUS to calculate the new fill roadbed settlement rule. The results shown the pavement subsidence curve that obtained by the revising layer wise summation method is obviously similar to the observation result, and can reflect the deformation law of the pavement in different positions accurately. The calculation method can be used for soft soil roadbed settlement Calculation, and provides reference for the design and construction of subgrade engineering.