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1、基于Fredlund&Xing参数下不同雨型边坡渗透稳定性分析魏麵张麵王军磊王天兴朱文炜鵬雄河海大学水利水电学院摘要:为研宄Fredlund&Xing模型不同非饱和土参数a、m、n在不同雨型不对边坡渗流特性以及稳定性影响,利用Geo-slope软件中的Seep/W和Slope/W模块进行流固耦合计算,分析了总降雨量为0.1m下不同参数在平均型,前锋型,中锋型以及后锋型降雨下对坡顶和坡脚监测点的孔压以及边坡稳定性的变化规律,得出了安全系数的变化曲线,计算结果表明:不同参数下,坡顶处孔压先增大,后逐渐降低,坡脚处孔压先增大,后保持不变;安全系数总体上呈现持
2、续下降的趋势;参数a与进气值相关,a值越小孔压变化越剧烈;参数m与剩余含水量有关,但不同m值之间孔压相差不大;参数n与土-水特征曲线的斜率有关,n越大,孔压变化速率越大,安全系数降幅越大;不同降雨雨型影响了坡顶和坡脚孔压达到最大值的吋刻,对安全系数影响较小.研宄成果为不同非饱和参数土体在不同降雨雨型下边坡稳定性分析和治理提供丫参考.关键词:Fredlund&Xing参数;降雨入渗;降雨雨型;非饱和渗流;边坡稳定;作者简介:郁舒阳(1993-),男,硕士研究生,研究方向为水工结构工程.E-mail:yushuyanghhu@163.com收稿曰期:201
3、7-07-04基金:W家科技支撑计划项目(2015BAB07B10)SeepageandSlopeStabilityAnalysisunderDifferentRainfallPatternsBasedonFredlund&XingParametersYuShuyangZhangJixunWangJunleiWangTianxingZhuWenweiHuNanxiongCollegeofWaterConservancy&HydropowerEngineering,HohaiUniv.;Abstract:Inordertostudytheinfluenc
4、eofdifferentunsaturatedsoilparameters:a,m,n,whichareputforwardinFredlund&Xingmodelonseepagecharacteristicsandslopestability,thefluidsolidcouplingiscalculatedbytheSeep/wandSlope/wmodulesinGeo-slope,andtheporewaterpressureoftopandtoemonitoringpointaswellasslopestabilityareanalyzed
5、underdifferentrainfallpatternssuchasaveragetype,forwardtype,centertypeandpost-peaktype,thevariationcurveofsafetyfactorisobtained.Resultsshowthatunderdifferentrainfalltypestheporewaterpressureincreasesduringtherainfallandthendecreasesaftertherainfallonthetopofslope,whileitincreas
6、esandthenmaintainsunchangedatthetoe;thesafetyfactorshowsadownwardtrendonthewhole;parameteraisrelatedtoairentryvalue,thesmallerais,thegreaterporewaterpressurechanges;parametermisrelatedtoresidualwatercontent,thelargermis,thelargerporewaterpressureis,andthelowersafetyfactoris,butt
7、hedifferenceofporewaterpressurevaluesarelittle;paramctcrnisrelatedtotheslopeofsoil-watercharacteristiccurve,thelargernis,thesharperchangerateofporewaterpressureis,thelargertheamplitudereductionofsafetyfactoris;differenttypesofrainfallaffectthemomentofmaximumporepressure,buthavel
8、ittleinfluenceonsafetyfactor.Theresearchresults