109国道冻土路基动力融化固结研究

Study on experiment and numerical simulation of melting consolidation of 109 national highway

在冻土路基非稳态温度场控制方程和融化固结理论模型的基础上,以109国道橡皮山地区典型路基土体粉质黏土制做的圆柱体力学模型为研究对象,采用有限元软件ABAQUS建立计算模型,并与室内试验结果对比,提出了土体冻结和融化过程中的温度场和融化沉降的变化规律.研究结果表明:在动荷载作用下,土样变形量随时间而增大,最终达到了稳定形式,而在不同幅值动荷载作用下,土样变形量存在明显差异,在一定的范围内,动荷载幅值大小对冻结土体融化速率作用有限.

Based on the control equation of the non-stationary temperature field and one-dimensional melting consolidation theory, this paper puts forward the coupling calculation model of the heat-mois- ture-stress field. By the detail calculation example with the section of Xiang Pi Mountain in 109th national highway, mechanical model of the cylinder made by typilcal soil silty clay is studied. In this paper, in order to solve this problem we apply finite element software ABAQUS to establish the mechanical model. The results indicate that soil deformation increased with time under dynamic load and finally reached a steady state. However, the situation was very different with that soil under different amplitude loadings. What＇s more, we can draw the conclusion that dynamic loading amplitude paid little role to melting rate to certain extent.