土工格栅加筋边坡地震平均永久位移影响因素分析

考虑到现有的工程实例和实验数据较少，本文采用数值分析的方法，分析了地震作用下加筋边坡各参 数对平均永久位移的影响. 计算结果表明，地震作用下的加筋边坡工程中，对平均永久位移有较明显影响的参 数主要有填土内摩擦角，填土粘聚力，水平地震荷载和土工格栅轴向刚度；土工格栅层数越多，越有利于减 小加筋边坡的平均永久位移；边坡靠近底部的土工格栅比中部和顶部位置的土工格栅对减小边坡在地震作用 下平均永久位移更有效；水平方向的地震荷载对地震作用下加筋边坡的平均永久位移的影响比竖直地震荷载 更明显. 因此，在土工格栅加筋边坡的设计中，为了能有效减小地震引起的平均永久位移，需要选取粘聚力和 内摩擦角较大的填土材料和轴向刚度较大的土工格栅材料，同时适当增加土工格栅的层数并着重考虑边坡底 部土工格栅的设置.
Consideringthatthedataofexperimentalandengineeringaboutgeogridreinforcedsoilslopeisinsufficient, theinfluenceparametersofthegeogridsreinforcedsoilslopesubjecttoseismicactiononslopeaveragepermanentdis? placementwereanalyzedbynumericalanalysisinthepaper.Theresultsshowthattheparametersofgreatinfluenceson thegeogridreinforcedsoilslopeincludedsoilinternalfrictionangle,soilcohesionforce,horizontalseismicactionand geogridsaxialstiffness.Thegeogridssetatthebottomofslopedecreasedtheslopeaveragepermanentdisplacement moreeffectivethanthoseatthemiddleandtopofslope,andthemoregeogridslayerswere,themoreeffectivetheslope averagepermanentdisplacementcoulddecrease.Consequently,inthedesignofgeogridsreinforcedsoilslopeengineer? ing,thesoilwithlargercohesionforceandinternalfrictionandthegeogridswithlargeraxialstiffnessshouldbechosen, meanwhile,theamountofthegeogridsespeciallythoseatthebottomoftheslopeshouldbeincreasedsoastodecrease theslopeaveragepermanentdisplacementasmuchaspossible.