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1、第28卷第10期岩土力学Vol.28No.102007年10月RockandSoilMechanicsOct.2007文章编号:1000-7598-(2007)10-2046-06碎石土滑坡的因素敏感性计算分析12许建聪,尚岳全(1.同济大学地下建筑与工程系,上海200092;2.浙江大学建筑工程学院,杭州310027)摘要:通过资料搜集整理和分析、现场工程地质调查与勘探和室内外的物理力学试验,采用弹塑性接触有限元强度折减法、不平衡推力法和数理统计分析法,结合工程实例,分析了影响碎石土滑坡各因素的敏
2、感性,结果表明,按因素敏感度从大到小排列,主要影响碎石土滑坡稳定性的因素依次为滑面岩土体内摩擦角、地形坡度、滑体饱水面积比和滑面岩土体的内聚力。地形坡度大、具有低内摩擦角滑面的碎石土滑坡的整体稳定性较差,而连续降雨、强降雨会抬高地下水位增大滑体饱水面积比,降低滑面带岩土体抗剪强度,增加下滑力,对碎石土滑坡的稳定性将产生最不利的影响。同时,在对碎石土滑坡进行加固处理时,必须优先考虑采取提高滑面等效内摩擦角、降低地形坡度结合降低地下水位措施,其次考虑采取提高滑面岩土体内聚力的措施。关键词:碎石土滑坡;弹
3、塑性有限元;接触算法;不平衡推力法;因素敏感性中图分类号:TU431文献标识码:ASensitivityanalysisofinfluencingfactorsofdebrislandslide12XUJian-cong,SHANGYue-quan(1.DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,China;2.CollegeofCivilEngineeringandArchitecture,Zhejiang
4、University,Hangzhou310027,China)Abstract:Connectedwiththeengineeringconcreteexample,throughthecollection,arrangementandanalysisofrelateddata,thesiteinvestigationandexplorationofengineeringgeology,indoorandoutdoorphysico-mechanicaltests,adoptingtheanaly
5、ticmeansofmathematicstatistics,unbalanced-thrustmethodandnon-separationcontactelastoplasticFEMtogether,theinfluencingfactorsensitivityofdebrislandslidehasbeenanalyzedandresearched.Theresultsshowasfollows.First,throughthesensitivityanalysisofmainfactors
6、toinfluenceonthestabilityofdebrislandslide,itsmaininfluencedfactorsareinternalfrictionangleofslidingsurface,topographicgrade,saturation-arearatioofslope-massandcohesionofslidingsurfacebydescendingorderoftheirsensitivitycoefficients.Second,theintegralst
7、abilitycoefficientofdebrislandslidewithlargetopographicgradeandtheslipsurfaceofsmallinternalfrictionangleismoreinferior.Butsteadyrainandintensiverainfallcanraisegroundwaterlevel,augmentsaturation-arearatioofslope-mass,lowertherockandsoilshearstrengthof
8、slip-surface,andincreasedownwardslidingforce,whichwillbringaboutthemostdisadvantageinfluenceonthestabilityofaconcretedebrislandslide.Meanwhile,onreinforcingandtreatingthedebrislandslide,themeasureraisingequivalentangleofslip-surfaceinte