高性能土工格栅加筋土挡墙数值仿真与参数分析研究

Numerical Simulation and Parameter Analysis of Soil Retaining Wall Reinforced by High⁃Performance Geogrids

以西南地区复杂环境下土工格栅加筋土挡墙为工程依托,采用有限元软件进行数值模拟,研究不同设计参数与不同地震荷载作用下加筋土挡墙受力变形特征。研究表明,随着土工格栅抗拉强度、土工格栅长度的增加,挡墙的变形逐渐减小,以水平变形为例,高性能土工格栅较常规土工格栅减小量为42%,筋材长度由6 m变化为10 m,减小量为14%;随着土工格栅竖向间距的增大,结构变形逐渐增加,同样以水平变形为例,当土工格栅间距由0.6 m增大至1.2 m时,增幅约为29%。研究结果表明,土工格栅抗拉强度是影响加筋土挡墙稳定性的重要因素,筋材竖向间距的影响次之,而筋材长度对结构变形特征的影响较小。在水平与竖向地震荷载作用下,加筋土挡墙的变形量随地震加速度的增加而增大;相较于普通土工格栅,高性能土工格栅限制加筋土挡墙变形行为更显著。

Based on a project of retaining walls reinforced by high⁃performance geogrids in the complex environment of southwest China,finite element software was used to conduct numerical simulations and the stress and deformation characteristics of the geogrid reinforced soil(GRS)walls under different design parameters and different earthquake loads were studied and analyzed.The results shows that as the tensile strength of the geogrid increase and the length of the geogrid increase,the deformation of the retaining wall gradually decrease.Taking the horizontal deformation as an example,the reduction is 42%when using high⁃performance geogrids compared to normal geogrids.When the length of the reinforcement increases from 6m to 10m,the reduction is 14%.As the vertical spacing of the geogrid increases,the deformation of the structure gradually increases.Taking the horizontal deformation as an example,when the vertical spacing increases from 0.6 m to 1.2 m,the increase is about 29%.The tensile strength of the geogrid is an important factor affecting the stability of the GRS walls,followed by the vertical spacing of the geogrids,while the length of the geogrid has little effect on the structural deformation.Under the action of horizontal and vertical seismic loads,the deformation of GRS walls increases with the increasing seismic acceleration.Compared to normal geogrids,the restriction behaviour of retaining walls reinforced by high⁃performance geogrids is more obvious.The results of this study can provide certain references for the application and promotion of high⁃performance geogrids in reinforced soil structures.