考虑应力水平的加筋土格栅蠕变研究

在考虑了加筋土中的格栅上各点的应力水平下对格栅的蠕变进行研究,采用三参数的黏弹性流变模型对格栅的蠕变进行模拟,并将格栅上各点的应力与流变模型进行耦合,得到加筋体中考虑应力水平的格栅各点蠕变的三维图像。研究发现,筋材的蠕变量并不是随着深度的增加而增大,筋材的蠕变最大并不是出现在最下层;另一方面,由于土体在格栅的轴向存在不均匀性,将对格栅各点的蠕变产生影响。利用试验和理论相结合的办法,将土体轴向的不均匀性纳入到分析中,也为解决土体的各向异性对格栅蠕变的影响这一难题提供了参考。

Creep of Geogrid in Reinforced Soil in Consideration of Stress level

The creep of geogrid in reinforced soil is researched in consideration of the stress level at each point of the geogrid.A viscoelastic rheological model with three parameters is adopted to simulate the creep and is coupled with the stress of each point on the grid.Three-dimensional images of the creep in consideration of geogrid’s stress level are obtained,and the results show that the creep of geogrid does not increase with the increase of depth,and the maximum creep does not occur at the bottom layer.Moreover,the axial inhomogeneity of soil will affect the creep of each point on the geogrid.By combining test and theoretical analysis,the axial inhomogeneity of soil is considered,and a reference is offered to solve the problem of anisotropy of reinforced soil influencing on geogrid creep.