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为了解差异沉降对拓宽道路的影响,应用有限元程序建立了差异沉降的计算模型,从沉降和水平位移方面分析了新旧地基不同固结程度对高速公路拓宽路基的影响。结果表明,新旧地基的固结程度差异会影响沉降曲线的形状,尤其对差异沉降的影响较大。当新路基下地基压缩模量不变,改变老路基下地基压缩模量,最大差异沉降从8.89 cm减小至5.35 cm。但当老路基下地基压缩模量提高到15 M Pa以后,沉降的减小程度减弱。当旧路基下地基压缩模量不变,改变新路基下地基压缩模量,最大差异沉降从7.92 cm减小至3.23 cm。当新路基下地基压缩模量提高到10 M Pa时,沉降的减小最为明显,20 M Pa以后减小趋势变弱。
In order to understand the influence of differential settlement on the widening of the road, a finite element program is used to establish the calculation model of differential settlement, and the influence of different consolidation degrees of new and old foundation on the widening roadbed of expressway is analyzed from the aspects of settlement and horizontal displacement. The results show that the difference between the consolidation of old and new foundations will affect the shape of the settlement curve, especially the differential settlement. When the compressive modulus of foundation under the new subgrade is unchanged, the maximum differential settlement decreases from 8.89 cm to 5.35 cm when the compressive modulus of foundation under the old subgrade is changed. However, when the compressive modulus of foundation under the old subgrade is increased to 15 M Pa, the reduction of settlement is weakened. When the compressive modulus of the foundation under the old embankment is constant, the maximum differential settlement decreases from 7.92 cm to 3.23 cm when the compressive modulus of foundation under the new subgrade is changed. When the compressive modulus of subgrade under the new roadbed is increased to 10 M Pa, the reduction of settlement is the most obvious, and the decreasing trend becomes weaker after 20 M Pa.