加筋土高边坡的有限元分析  

FEM analysis of high reinforced soil slopes

作　　者：介玉新[1] 秦晓艳[2] 金鑫[1] 徐文杰[1] 王恩志[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]北京国电龙源环保工程有限公司,北京100039

出　　处：《水利水电科技进展》2012年第1期83-86,共4页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(50979047);国家重点基础研究发展计划(973计划)(2010CB732103);水利部公益性行业科研专项(201001027)

摘　　要：针对某土工格栅加筋土高边坡的初步设计断面进行有限元计算分析,改变回填土变形模量、泊松比以及土工格栅的变形模量进行计算。计算结果表明:土工格栅最大轴力的大小在每级边坡内部沿竖向的分布近似成三角形或梯形,在整体上的分布则呈锯齿形,轴力突变主要发生在两级边坡相邻的位置。回填土变形模量的变化对填筑体竖向位移的影响较大,而对水平位移的影响相对较小,较小的回填土变形模量会导致边坡位移增大以及格栅轴力增加,但对其分布基本没有影响;格栅变形模量的变化主要影响格栅轴力的大小,格栅变形模量降低时轴力会相应降低,变形模量增加时轴力也会相应增大。在实际工程中适当降低筋材的变形模量,有利于减小筋材受力,降低筋材破坏的风险。A geogrid-reinforced soil slope is calculated and analyzed by use of the finite element method（FEM）.In the calculation,the deformation modulus and Poisson＇s ratio of the backfill as well as the deformation modulus of the geogrid are altered.The results show that the vertical distribution of the maximum axial force of the geogrid in each step of the slope is approximately in a shape of triangle or trapezoid,while the overall distribution is in a shape of zigzag.The abrupt change of the axial force occurs at the adjacent position of two steps of the slope.The variation of the deformation modulus of the backfill has greater influence on the vertical displacement of the slope than on the horizontal displacement.Much lower deformation modulus of the back fill may induce the increase of the slope displacement and the axial force of the geogrid,and it haslittle influence on their distribution patterns.The variation of the deformation modulus of the geogrid mainly affects the magnitude of its axial force.The decrease of the deformation modulus leads to the decrease of the axial force in the geogrid,and vice versa.Therefore,appropriate reduction of the deformation modulus of the geogrid in practice is helpful in reducing the forces acting on the geogrid and its failure risks.

关 键 词：加筋土边坡 土工合成材料 土工格栅 变形模量 有限单元法 

分 类 号：TU43[建筑科学—岩土工程]