新旧地基不同固结程度对拓宽路基差异沉降的影响

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。

Influence of Different Consolidation Degree of New and Old Ground on Differential Settlement in Widening Embankment

In order to know the differential settlement of the widening embankment,the influence of different consolidation degree of new and old ground on differential settlement in widening embankment is analyzed with the finite element analysis.The result shows that the consolidation degree of the new and old ground will affect settlement curve,especially to the differential settlement.When the ground compression modulus under the new embankment is invariable,changing the ground compression modulus under the old embankment,the biggest differential settlement reduces from 8.89 cm to 5.35 cm.When the ground compression modulus of the old roadbed enhances to 15 MPa,the reducing degree of the settlement is weaken.While when the ground compression modulus under old embankment is invariable,changing the ground compression modulus under the new embankment,the biggest differential settlement reduces from 7.92 cm to 3.23 cm.When the ground compression modulus of new embankment enhances to 10 MPa,the settlement will reduce evidently,and the reducing degree of the settlement is weaken when 20 MPa.