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时间:2019-03-06
《均质土坡滑动面变分法分析》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第25卷增1岩石力学与工程学报Vol.25Supp.12006年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2006均质土坡滑动面的变分法分析尤明庆(河南理工大学能源科学与工程学院,河南焦作454010)摘要:土坡稳定性分析的方法和结果尚没有统一的结论。因此,以下滑总力与抗滑总力之差为评价指标,利用变分法寻找该指标达到最大值的极值曲线,则指标最大值为0的极值曲线就是可能的滑动面。研究结果表明,可能的滑动面都通过坡脚,临界坡高可以由土的黏聚力c、重度γ、内摩擦因数μ和坡度k明确给出。如果土坡稳定设有安全系数,则将黏聚力c和内摩擦因数
2、μ按比例折减即可。由于直线是圆弧的特例,圆弧是连续曲线的特例,相应的临界坡高依次递减;不过对于垂直边坡这三者差别不大,而对于一般的斜坡,极值曲线最低点低于坡底以增大坡肩附近的下滑力,接近坡脚时逆坡的阻滑力由于坡面降低作用较小,因而临界高度远小于平面滑动得到的数值。关键词:岩土力学;滑坡;均质土坡;临界高度;变分法中图分类号:TU45文献标识码:A文章编号:1000–6915(2006)增1–2735–11STUDYONLANDSLIDEOFHOMOGENEOUSSOILWITHCALCULUSOFVARIATIONSYOUMingqing(SchoolofEnergySciencean
3、dEngineering,HenanPolytechnicUniversity,Jiaozuo,Henan454010,China)Abstract:Theclearconclusionsaboutthestabilityofsoilslopehavenotbeenachievednowadays,suchastheslippingsurfacegoesthroughtheslopefootornot.Thedifferenceofslippingforcetoresistanceforce,nottheratioasusually,isusedasanevaluationindexo
4、fthesoilslopestability,andthelimitcurve,alongwhichtheevaluationreachestoitsmaximumvalue,isstudiedwithcalculusofvariations.Theslippingsurfaceinasoilslopeisthelimitcurveofwhichtheevaluationapproachestozero.Onthisdefinition,itisproventhatalltheslippingfaceswillpassthroughtheslopefoot,andthecritical
5、heightofsoilslopeisaformulaofcohesion,internalfrictioncoefficient,gravityandtheslopeangle.Ifthereisasafetycoefficientinthestableanalyses,thecriticalheightcanbecalculatedwiththesameformulainwhichthecohesionandinternalfrictioncoefficientisdividedbythesafetycoefficient.Linesarespecialcircles,andcir
6、clesarespecialcontinuouscurves,sothecriticalheightsforthembecomesmalleronebyone.Asforverticalslope,thedifferenceamongthethreecriticalheightsarenotgreat.Butforgeneralslopes,thelowestpointinlimitcurveisbelowtheslopefloor,whichresultsingreatslippingforcearoundslopeshoulder.Meanwhile,theresistancefo
7、rcefromthenegativeslopenearthefootissmall.Soitscriticalheightismuchlowerthanthatfromplanfailure.Keywords:rockandsoilmechanics;landslide;simpleslope;criticalheight;calculusofvariations式,对可能的滑动面进行力学平衡分析,从而寻找[1]1引言出安全系数最小的滑面。土力
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