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为建立拓宽路基荷载下地基差异沉降控制标准,以拓宽路面结构附加变形临界值为控制目标,依托有限元分析软件,建立拓宽路基荷载下地基沉降的计算模型,通过拟合地基沉降曲线,并将其作为位移约束条件施加到路堤底面,分析路堤顶面的沉降特性,反算出拓宽荷载下地基差异沉降控制限值,并以此作为拓宽荷载下地基差异沉降控制标准。研究结果表明:随着填方高度的增加,地基差异沉降限值呈增大趋势;随着拓宽比的增加,地基差异沉降限值呈减小趋势;随着路堤填料弹性模量的增加,地基差异沉降限值呈增大趋势,然而随着地基填料弹性模量的增大,地基差异沉降的限值呈减小趋势;4个影响因素的影响程度大小依次为新老路堤拓宽比、路堤填料模量、地基填料模量、路堤填方高度;得出了地基差异沉降控制值与新老路堤拓宽比和路面结构反坡率之间的关系表达式。
In order to establish a control standard to widen the differential subsidence under subgrade loads and to broaden the additional deformation threshold of the pavement structure as the control target, a finite element analysis software was used to establish a calculation model to broaden the subgrade settlement under subgrade loading. By fitting the subsidence curves, It is applied to the bottom of the embankment as a displacement constraint, and the settlement characteristics of the embankment top surface are analyzed. The control limits of differential settlement under the widening load are calculated and used as the control standard for the differential settlement of the foundation under widening load. The results show that with the increase of filling height, the settlement limit of foundation subsidence tends to increase. With the increase of the aspect ratio, the subsidence limit of subsidence shows a decreasing trend. With the increase of embankment packing elastic modulus, However, with the increase of the elastic modulus of foundation packing, the limit value of differential subsidence shows a decreasing trend. The influencing factors of four influencing factors are as follows: the ratio of new and old embankments, the embankment filler Modulus, modulus of foundation packing and height of embankment fill. The expression of the relationship between the control value of foundation subsidence and the ratio of new and old embankment width to the ratio of road surface structure backslip was derived.