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1、ABSTRACTGuangxiislocatedinthesouthernregionofChina,ithashumidandrainyallyear.Inrecentyears,thedevelopmentofeconomyandtheincreasingofhumanactivitiesleadtodestroythegeologicalenvironment.Finally,itimprovesthepossibilityofgeologicaldisastersandbringsgreatlossestopeople'slivesandprope
2、rty.Therefore,accordingtothemeteorologicalandtopographicalcharacteristicsinGuangxi,lookingrealisticrainfallfactoranddeterminingslopestabilityareveryimportant.Inthispaper,thereisfuzzycomprehensiveevaluationonrainfallfactors,rainfallfactorsinrainfallinfiltrationmodelareoptimizedsele
3、ctionbyfuzzymathematicmethod,improvingtheobjectivefunctionvalue,thustheresultagreeswithactualsituation.ThroughusingGeostudiosoftwaretoanalyzeslopestabilityunderrainfallconditions,itcanaccuratelyevaluatetheslopefailureprobability.Meanwhile,itcanprovidesomereliableevidencesformanual
4、controlofslopeinstability.Itshowsthisstudyhasimportanttheoreticalsignificanceandapplicationvalue.Themainresultsareasfollows:（1）Intheoptimalselectionofrainfallfactorprocess,therainfallintensity,rainfalldurationandrainfalltyperegardasobjectset.theminimumslopesafetyfactor,slopefailur
5、eprobability,thefirsttoreachthesaturationpointandtransientsaturationarearegardasevaluationindex.TheproperrainfallfactorareobtainedthroughregressionfittingfuzzycomprehensiveevaluationwhichisbasedonSAS8.1statisticalanalysissoftware.（2）Inrainfallinfiltrationprocess,Porewaterpressurel
6、ocatedinslopesurfacereachestopositivevalue,Porewaterpressurewithinacertaindepthrangeisimproved,andtheporewaterpressurebelowthegroundwatertablehasbeengreaterthanzero.Inaddition,Afeaturessectionisselectedtoanalyzethechangesofporewaterpressureatdifferentpositions,itshowsthatthefarthe
7、rthedistancefromslope,thesmalltheporewaterpressurewouldbe.Rainfallinfiltrationdepthis6.5metersatthissoillayer.（3）Withtheincreasingofrainfallintensity,thesafetyfactordecreasesrapidly,andthechangerangealsohasincreased.Theslopesafetyfactordecreaseswiththeincreasesofrainfallduration,a
8、fterrainstops,slopesafetyfactordo
