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针对非均质软土地基上土工格栅的加筋效应进行了二维及三维有限元对比分析,阐明了这2种方法各自的适用性。随后对加筋层数、加筋位置、加筋间距、软基模量及路堤填筑速度进行了系统的三维敏感性因素研究。数值计算结果表明:路堤及路面施工引起的地基变形主要发生在软弱土层中,且其最大值位于软土层中部;铺设在路堤底部的、相距为0.25 m左右的2层土工格栅对于路堤及软基的加筋效果最佳;为了减小工后变形,需要减缓路堤的填筑速度,就本文描述工况而言,比较合理的路堤填筑速度为2.5 cm/d左右。上述研究成果有助于优化软弱地基上加筋路堤的设计与施工。
The two-dimensional and three-dimensional finite element analysis of the reinforcement effect of geogrid on heterogeneous soft ground is made, and the applicability of these two methods is illustrated. Then the three-dimensional sensitive factors of stiffened layer, stiffened position, stiffened spacing, soft-foundation modulus and embankment filling speed were studied. The numerical results show that the deformation of foundation caused by the embankment and pavement construction mainly occurs in the soft soil layer and its maximum value is located in the middle of the soft soil layer. The 2-layer geogrid laying at the bottom of the embankment with a distance of 0.25 m is suitable for the embankment And the reinforcement effect of soft foundation is the best. In order to reduce the post-construction deformation, it is necessary to slow down the embankment filling speed. For the conditions described in this article, the reasonable embankment filling speed is about 2.5 cm / d. The above research results help to optimize the design and construction of reinforced embankment on soft ground.