中文摘要：

为了研究交通荷载作用下考虑软土软化效应的软基加筋道路加筋效果的影响因素,首先以室内动三轴试验为基础,通过回归分析得到了软土在循环荷载作用下动模量衰减的经验公式;然后编制了用户子程序将该公式导入有限元分析软件ABAQUS中,采用有限元分析了荷载形式、荷载频率、筋材模量、加筋位置、加筋层数、软土层厚度等对加筋效果的影响。结果表明,随着荷载频率的增大,加筋效果呈减小趋势。加筋效果会随着筋材模量的增大和加筋层数的增多而增大。当筋材铺设在面层和基层之间时,加筋效果最好。在软土层厚度较小时,加筋效果随软土层深度增大有明显提高;但在软土层厚度较大时,加筋效果随软土深度增加提高较少。

英文摘要：

A parametric study was carried out to evaluate the beneficial effect of geogrid reinforcement in the pavement under traffic loading considering softening behavior of clay. Firstly, cyclic triaxial tests were conducted to investigate the effect of initial deviator stress, loading frequency, overconsolidation ratio, and cyclic stress ratio on softening behavior of clay. The empirical equation for softening of clay was proposed by regression analysis method. The equation was imported into FEM program ABAQUS through compiled subroutine. A series of finite element simulations were carried out to investigate the beneficial effect of geogrid reinforcement on the vertical displacement, and how such effects were influenced by the loading forms, loading frequency, geogrid modulus, geogrid location, geogrid layers and subgrade thickness. It was indicated that the greater the loading frequency was, the less the beneficial effect of geogrid reinforcement was. With the increase of geogrid modulus and geogrid layers, the effect of reinforcement increased. Among the three locations examined for the geogrid reinforcement, the best location which resulted in the highest reduction in the value of vertical displacement was at the bottom of pavement. For small subgrade depth, the effect of reinforcement significantly increased with the increase of subgrade depth. But for large subgrade depth, the effect of reinforcement did not significantly increased with the increase of subgrade depth.