水泥稳定碎石早期收缩应变有限元分析

为了得出水泥稳定碎石基层早期温度场以及收缩应变的变化规律,借助ABAQUS有限元软件,对水泥稳定碎石基层结构建立三维有限元模型,并与某已建公路试验路段的测量数据对比,确定模型的可靠性。结果表明:水泥稳定碎石收缩应变在7d后基本与温度负相关,温度降低,收缩应变增加;水泥稳定碎石基层厚度的变化对基层温度场和收缩应变的影响较大;基层层顶与层底的温度差随着厚度的增加逐渐增大;基层内的平均收缩应变随着厚度的增加逐渐减小。

Finite Element Analysis of Shrinkage Strain of Cement Stabilized Crushed Stone in Early Age

To obtain the variation rule of temperature field and shrinkage strain for cement stabilized crushed stone base in early age, a three-dimensional finite element model of cement stabilized gravel structure is established by using ABAQUS finite element software. The reliability of the model is determined by comparing the measured data of a certain highway. The results show that the strain of cement stabilized crushed stone is negatively correlated with temperature after seven days, and the shrinkage strain increases with the decreasing temperature. The change of the cement stabilized crushed stone base thickness has a great influence on the temperature field and shrinkage strain. The difference of temperature between top and bottom of base is increased with the increase of base thickness. The average of the shrinkage strain in base is decreased with the increase of base thickness.