土工织物加固软土路堤的有限元分析

采用有限元方法对土工织物加固软弱地基路堤的力学机理进行了研究.通过比较路基加筋和未加筋两种情况研究了土工织物的加固机理,结果表明土工织物对于提高路堤填筑高度、减少路堤侧向位移、均化路堤沉降以及加速超孔隙水压力消散有显著的效果.加筋路堤中土工织物的轴力受填筑高度、超孔压消散速度和接触面系数等因素的影响,路堤填筑高度和施工进度的控制有利于土工织物抗拉强度的发挥.对路堤安全系数的研究分析表明传统的极限平衡法验算路堤稳定性偏于保守,采用有限元方法能较好地反映土工织物的加筋作用,可以优化工程设计.

Finite element analysis of road embankment on soft soil reinforced with geotextiles

A road embankment on soft soil reinforced with geotextiles is analyzed with finite element method. By comparing the unreinforced road embankment with reinforced one, it shows that the stability of road embankment is increased by reinforcement in soils. Geotextiles can notably improve the construction height, decrease the horizontal displacements and asymmetrical settlement of the soft soil, and increase dissipation speed of pore water pressure. The axial force of geotextiles is influenced by construction height, pore warer pressure dissipating, and soil-reinforcement interface condition. Safety factor analysis shows that the limited equilibrium method is conservative to analyze stability of embankment. Designs can be optimized by analyzing the geotextiles reinforced embankment with FEM.