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ID:35151842
大小:1.29 MB
页数:52页
时间:2019-03-20
《基于降雨条件下饱和-非饱和土坡的稳定分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、兰州理工大学硕士学位论文降雨条件下饱和-非饱和土坡的稳定分析姓名:张琦申请学位级别:硕士专业:岩土工程指导教师:李萍20070501摘要降雨入渗是非饱和土边坡失稳的主要诱发因素。本文针对降雨条件的土坡稳定问题,运用降雨入渗理论、饱和一非饱和渗流理论、非饱和土抗剪强度理论、土坡稳定分析方法等多种手段,系统的分析了降雨入渗情况下降雨强度、降雨持时、土壤饱和渗透系数等参数对饱和一非饱和渗流场和土坡稳定的影响,得出了一些有益的结论。文中以总水头为基本未知量推导了饱和一非饱和渗流的控制方程。基于Galerkin有限元法推
2、导了饱和一非饱和渗流计算有限元列式。运用MATLAB软件编制的渗流计算程序FLOW2D计算给定降雨条件下的土坡孔隙水压力分布,探求了降雨强度、降雨持时、土壤饱和渗透系数等参数的变化对渗流场的影响。文中将渗流场的孔隙水压力引入非饱和土抗剪强度理论中,并将其作为土坡稳定分析的重要因素。运用MATLAB软件编制的土坡稳定分析程序STAB2D计算得出了相应情况下的土坡稳定安全系数的变化规律,探讨了各参数变化对边坡稳定性安全系数的影响。可为非饱和土土坡稳定分析、滑坡灾害预报和土坡治理等方面提供有用的参考数据,具有一定的理
3、论意义和实用价值。关键词:降雨入渗;饱和一非饱和渗流:土坡稳定分析;有限元AbstractLandslideiscloselyrelatedtorainfall,andforunsaturatedsoilslopetheraininfiltrationisthemostimportantonethatresultsinlandslide.Itisofgreatsignificancefortheprecautionoflandslidetomakeadeepstudyofthelandslidelawunder
4、rainfallandestablishaquantitativemodelforanalysis.Inordertoanalyzetheinfluenceofrainfallontheunstaturatedsoilslopes’stability。onthebasisoftherainfallinfiltrationtheory,thesaturated·unsaturatedseepagetheory,theunsaturatedshearstrengththeory,theslopestabilitya
5、nalysismethod,itisanalyzedcompletelythattheinfluenceofrainfallintensity,rainfalldurationandsaturatedcoefficientofpermeabilitytoseepagefieldandstabilityoftheunstaturatedsoilslope,andgainssomebeneficialconclusions.Onthebaseofbasicseepagephysicsequation,regardi
6、ngpressurehydraulicheadasabasicunknownquantitytodeducesaturated—unsaturatedseepagedifferentialequation,theFEMformatofdifferentialequationisdeducedbasedOUGalerkinmethod.AccordingtotheseepagecalculationalprogramwithMATLABsoftwareundertheconditionofrainfall,the
7、disposalofporewaterpressureiscalculatedandtheinfluenceofseepagefieldwiththevariationofrainfallintensity,rainfallduration,coefficientofstaturatedpermeabilityiSstudied.Theporewaterpressureisimportedtotheunsaturatedshearstrengththeoryandisregardedastheimportant
8、factorfortheslopestabilityanalysis.AccordingtotheslopestabilityanalysisprogramwithMATLABsoftware,variationalruleofslopestabilitycoefficientofsecurityandtheinfluenceofvariationofseveralparameters
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