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StudyonRelationshipbetweenFissureDevelopmentand#br# StateofSoilinExpansiveSoil

  

  1. (1.FacultyofMiningEngineering,KunmingMetallurgyCollege,Kunming650033,China;
    2.YunnanGeologicalEngineeringSurveyandDesignInstitute,Kunming650041,China)
  • Online:2018-10-30 Published:2018-10-30

Abstract: Thedegreeoffissuredevelopmentofexpansivesoilunderdifferentwettingcyclesisdifferent.Inordertofindouttherelationshipbetweenstressstate,expansiveforceandthedevelopmentdegreeoffinalcracks,theexpansivesoilsfromPuzheheiAirportinWenshanBasin,YunnanProvince,weresampledandtestedunderdry-wetcycling.Theresultsshowhattheultimatecrackdevelopmentdegreeofexpansivesoiliscloselyrelatedtotheload.Theaveragecracklengthperunitareadecreasesfrom15317mm/10cm2under5kPaloadto10558mm/10cm2under40kPaload.Underthesameload,theaveragecracklengthperunitareaispositivelycorrelatedwiththeexpansiveforce,andtheexpansiveforceofsoilsampleis1276.KPacorrespondingto9783mm/10cm2 increasedto3952kPaofsoilsampleswellingforcecorrespondingto11391mm/10cm2.Theresultsshowthattheultimatecrackdevelopmentdegreeofexpansivesoilisrestrictedbyloadandisrelatedtoitsownexpansiveforce,whilethecrackdistributionisaffectedbywatercontentgradientdistribution.

Key words: expansivesoil, fissuredevelopment, stressstate, swellingforce

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