弹塑性有限元法确定土工格栅加筋路堤的沉降及承载力

Settlement and bearing capacity of geogrid reinforced foundation

地基土由于在其上部填筑路堤会发生沉降、变形 ,在路堤底部铺设土工格栅后 ,路堤及地基中的应力和变形均会发生变化。该文利用欧洲通用的岩土工程有限元软件PLAXIS分析比较了路堤在加筋和不加筋两种情况下的沉降大小、不均匀沉降的分布以及土体中的应力水平 ,指出了加筋能够减小路堤的沉降量和不均匀沉降 ,提高整体稳定性 ,减少路堤的变形发展。此外 ,该文还利用软件PLAXIS计算了地基土在表面加筋后的承载力大小 ,得出了加筋能够提高地基承载力的结论。

Settlement and deformation will take place in the foundation due to construction of embankment on it. When geogrid is laid beneath the embankment, the magnitude and distribution of settlement will vary because of reinforcement effects of geogrid. In this paper ,by using PLAXIS,the magnitude of settlement ,uneven settlement and stress level in the soil mass are compared with two different cases. The first case is the natural foundation without reinforcement and the other is the reinforced soil with geogrid. And by comparison, the significant effects of geogrid reinforcement are discussed. For example, it can reduce the uneven settlement of embankment, decrease its deformation and increase its stability.In addition, the magnitude of bearing capacity of reinforced foundation is calculated by PLAXIS.Finally, the extent of bearing capacity by geogrid reinforcement is estimated.