降雨入渗对花岗岩残积土高路堤边坡稳定性的影响.pdf

《降雨入渗对花岗岩残积土高路堤边坡稳定性的影响.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、第36卷第4期矿冶工程V〇1.36^42016年08月MININGANDMETALLURGICALENGINEERINGAugust2016降雨入渗对花岗岩残积土高路堤边坡稳定性的影响邓喜何忠明付宏渊、曾铃2(1.长沙理工大学交通运输工程学院，湖南长沙410114;2.长沙理工大学土木与建筑学院，湖南长沙410114)摘要：为研究降雨人渗对花岗岩残积土高路堤边坡内部水位线分布、负孔隙水压力消散、稳定性的影响，采用Geo-studio软件中的seep模块模拟短时间特大暴雨、长时间小强度降雨两种工况下边坡的人渗规律，并结合花岗岩残积土遇水软化的特性以及饱和-非饱和理论对现有的

2、饱和-非饱和抗剪强度理论、土体重度进行修正，最后将渗流计算的孔隙水压力导人到FLAC3I)中对路堤稳定性进行数值模拟，结果表明:花岗岩残积土高路堤边坡内部水位线随降雨历时增加由坡脚逐渐上升;相同降雨量下，长时间小强度降雨对边坡内部水位线上升的影响明显大于短时间特大暴雨工况;综合考虑负孔隙水压力的消散、软化效应、土体重度变化等因素的影响，短时间特大暴雨对边坡稳定性影响较小，长时间小强度降雨对花岗岩残积土高路堤边坡稳定性影响较大。关键词：道路工程；花岗岩残积土高路堤；降雨人渗；软化效应；稳定性中图分类号：TU432文献标识码：Adoi:10.3969/j.issn.0253-60

3、99.2016.04.004文章编号：0253-6099(2016)04-0011-05ImpactofRainfallInfiltrationonSlopeStabilityofHighEmbankmentwithGraniteResidualSoilDENGXi1，HEZhong-ming1，FUHong-yuan'，ZENGLing2(X.SchoolofTrafficandTransportationEngineering，ChangshaUniversityofScienceandTechnology，Changsha410114,Hunan，China;2.Sch

4、oolofCivilEngineeringandArchitecture，ChangshaUniversityofScienceandTechnology，Changsha410114，Hunan，China)Abstract:Inordertoanalyzetheeffectolrainfallinfiltrationonwaterlineinsideembankmentslope，negativeporewaterpressuredissipationandslopestability，theinfiltrationpatternwasinvestigatedbysimu

5、latingtwoconditions(short-timeparticularlyextraordinaryrainstormandlongsustainedrainfall)withtheseepmoduleofGeo-Studiosoftware.Theexistingsaturated-unsaturatedshearstrengththeoryandunitweightofsoilweremodifiedbasedonthecharacteristicsofgraniteresidualsoilbeingsoftenedwithwater，aswellassatur

6、ated-unsaturatedtheory.Finally，theporewaterpressureobtainedfromseepagecalculationwasinducedintoFLAC3Dforthenumericalsimulationofembankmentstability.Itisfoundthatwithtimegoingby，thewaterlineinsidetheembankmentofgraniteresidualsoilincreasesgraduallyfromtheslopefoot，andwiththesameprecipitation

7、，thesustainedsmallrainfallbringsgreaterinfluenceontherisingofwaterlineinsidetheslope.Withnegativeporewaterpressuredissipation，softeningeffectandunitweightofsoiltakenintocomprehensiveconsideration，itisconcludedthatsustainedsmallrainfall，comparedwithshort-