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1、基于Fredlund&Xing參數(shù)下不同雨型邊坡滲透穩(wěn)定性分析魏麵張麵王軍磊王天興朱文煒鵬雄河海大學水利水電學院摘要:為研宄Fredlund&Xing模型不同非飽和土參數(shù)a、m、n在不同雨型不對邊坡滲流特性以及穩(wěn)定性影響,利用Geo-slope軟件中的Seep/W和Slope/W模塊進行流固耦合計算,分析了總降雨量為0.1m下不同參數(shù)在平均型,前鋒型,中鋒型以及后鋒型降雨下對坡頂和坡腳監(jiān)測點的孔壓以及邊坡穩(wěn)定性的變化規(guī)律,得出了安全系數(shù)的變化曲線,計算結(jié)果表明:不同參數(shù)下,坡頂處孔壓先增大,后逐漸降低,坡腳處孔壓先增大,后保持不變;安全系數(shù)總體上呈現(xiàn)持
2、續(xù)下降的趨勢;參數(shù)a與進氣值相關(guān),a值越小孔壓變化越劇烈;參數(shù)m與剩余含水量有關(guān),但不同m值之間孔壓相差不大;參數(shù)n與土-水特征曲線的斜率有關(guān),n越大,孔壓變化速率越大,安全系數(shù)降幅越大;不同降雨雨型影響了坡頂和坡腳孔壓達到最大值的吋刻,對安全系數(shù)影響較小.研宄成果為不同非飽和參數(shù)土體在不同降雨雨型下邊坡穩(wěn)定性分析和治理提供丫參考.關(guān)鍵詞:Fredlund&Xing參數(shù);降雨入滲;降雨雨型;非飽和滲流;邊坡穩(wěn)定;作者簡介:郁舒陽(1993-),男,碩士研究生,研究方向為水工結(jié)構(gòu)工程.E-mail:yushuyanghhu@163.com收稿曰期:201
3、7-07-04基金:W家科技支撐計劃項目(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