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1、EPSC409:SurfaceProcessesAssignment3LandslideMechanicsNoteforusingExcelfile:DON’Tclickonthechart,don’tmesswiththegreycell.Ifyoumesssomethingup,reverttotheunchangeddownloadedfile.Foraderivationoftheequationsgotohttp://www.uwsp.edu/geo/faculty/lemke/geomorphology/le
2、cture_outlines/17_slope_stability.htmlBasedonthefactorofsafetyequation:generateaformulaforthecellsunder“drivingforce”and“resistingforce”(outlined)thatwillcalculateeachforceusingthegivenparameters(e.g.,density,thickness,etc.).c=cohesion,h=slabthickness,q=slopeangl
3、e,g=unitspecificweightslabmaterial,gw=unitspecificweightwaterf=angleofinternalfrictionNote1:g,orunitspecificweight,isSIMPLYdensity(r)*gravity.Note2:Let’strytogetthisasaccurateaswecan:theeffectofporepressureonthenormalforceisincorporatedintotheresistingforcesthrou
4、ghinclusionofthegwmfactorintheshearstrengthformula;butlet’saddinthechangestothedrivingforceaswell.Toapproximatetheeffectofhavingapartiallysaturatedslab,modifythedrivingforceequationsothattheweightoftheportionoftheslabwhichisabovethewatertableiscalculatedusingthe*
5、dry*densityofthematerial,whiletheweightoftheportionoftheslabbelowthewatertableiscalculatingusingthe*wet*densityofthematerial.Note3:Excel’sdefaultwhencalculatingtrigfunctionsistopresumetheinputangleisinradians;sincebothfandqareindegrees,youwillhavetodealwiththecon
6、version.1.Pleasewriteoutthemodifiedformulaeyouused.(Youdonothavetogivemeexactlywhatyoutyped-A2*B2…etc.;justwriteouttheformulaewiththechangesyoumade(e.g.,rgsubstitutedforg,etc.),includingtheconversionfromdegreestoradians.Next:setthefollowingasdefaultvalues(drygran
7、ularmaterial,nocohesion):Drydensity2000kg/m3H1mq15degreesG9.8m/s2f25C0M0AndinsertaformulaforFintotheappropriatecell(H3).ThechartontheExcelsheetshouldshowacomparisonofthedrivingandresistingforces,giveF,andtellyouwhethertheslopeisstable(safe…)ornot(SLIDE!!!).2.What
8、didyougetfordrivingandresistingforces,andF?3.WithALLOTHERparametersattheirdefaultvalues,varyEACHoftheparametersbelowoverthefollowingranges.Creategraphsofyourre
