8_Stability_problems_of_abandoned_clay_pits

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1、IAEG2006Papernumber295StabilityproblemsofabandonedclaypitsinBudapest12PÉTERGÖRÖG&ÁKOSTÖRÖK1Const.Mat.Eng.Geology,BudapestTech.Univ.(e-mail:gorogp@levele.hu)2Const.Mat.Eng.Geology,BudapestTech.Univ.(e-mail:torokakos@mail.bme.hu)Abstract:Thestudyarea,apreviousbrick-yard,islocatedinth

2、evaluablelandsoftheBudaMountains.Thebrickproductionendedin1972andtheopenpitwasrecultivatedbyheterogeneouslandfill.Theminingareawasanaturalslopethatexperiencedlandslidespriortotheclayproduction.Theminingactivityacceleratedtheslidingandcatastrophiclandslidestookplaceseveraltimesinthe

3、brick-yard.Theabandonedclaypitbecameavaluableconstructionsitefromthe1990'ies.Acomputerslopestabilitymodelwasusedtoanalysewhetherthisareaissuitableforhousingornot.TherawmaterialbelongstotwoclayformationtheOligoceneTardclay,andKiscellclay.Theclaysarecoveredbyloessanddebrisslide.TheKi

4、scellclayisdividedintotwounitshavingdifferentproperties.Thelowerlayerisgreyandimpermeable,whiletheupperoneisyellow,limoniticandhasalimitedpermeability.Fortheslopestabilityanalysesdatafromboreholesandgeophysicaltestswereused.Themaincauseoflandslidesisrelatedtotherainwaterinfiltratio

5、n.Theprecipitationseepsintotheupperdebrislayerandgetsintothesurfaceofthegreyclayeyunitdecreasingthefriction.Additionalwaterisdrivenfromspringsthatwerecoveredbyformerlandslidesandthemissingdrainagepipesofthearea.Theslidingsurfaceisattheboundaryofthegreyandyellowclay.Theslopestabilit

6、yandfactorofsafetywasanalysedinselectedsectionsalongtheslopebyusingPlaxisandGeo4softwares.ThePlaxissoftwareusesfiniteelementsmethodswhiletheGeo4softwareusesconventionalmethods,itcalculateswithcircleandpolygonalslipsurfaces.Résumé:Lesecteurd'étude,unbrick-yardprécédent,estsituédansl

7、esterresvalablesdesmontagnesdeBuda.Laproductiondebriquefinieen1972etlepuitsouvertétaitrecultivatedparleremblaihétérogène.Lesecteurd'extractionétaitunepentenormalequiaéprouvédeséboulementsavantlaproductiond'argile.L'activitéd'extractionaaccéléréleglissementetleséboulementscatastroph

8、iquesonteulieuplusieursfoi