International Commission on Large Dams (ICOLD) - Bulletin 135 - Geomembrane sealing systems for Dams

Description

Prepared by the European working group , 2010, p.468This new edition in 2010 cites 280 dams and updates the data and recommendations of the first two 38 and 78 Bulletins. It reviews the new information and practices that have appeared in the meantime, which include application of geomembrane as the only watertight element in fill dams, in Roller Compacted Concrete dams, as external joints on Roller Compacted Concrete dams, as underwater repair of dams on gravity dams and on Roller Compacted Concrete dams.Table of contents:IntroductionMaterials, testing, ageingLoads applied to geomembrane sealing systems (GSS)IntroductionMechanical loadsPhysical, chemical and biological attackGeomembranes for new constructon and rehabilitation of fill damsGeneralLoadingThe upstream systemThe internal systemPlacementTypical examplesGeomembrane on concrete and masonry damsRange of apllicationsDesign principlesLoadsGeomembrane sealing system - general conceptsInstallation techniquesTypical examplesGeomembranes for roller compacted concrete dams: new construction, rehabilitation and induced jointsRange of apllicationsDesign principlesLoadsGeomembrane sealing system - general conceptsInstallation techniquesTypical examplesSpecial casesGeneralSystems as repair of joints and cracksSystem on induced contraction jointsType of geomembraneUnderwater applicationsTypical ExamplesControl of quality of geomembrane sealing systemForewardQuality control and quality assuranceMQC itemsProcedures to assure survivalCQC itemsGuidance on technical content of contractsGeneral considerationsTechnical specificationsInstallation plan and scheduleQC planAcceptance criteria of performed worksWarrantyBill of quantities and conditionsConcluding remarksAnnexesAppendix 1 - data base for the 290 dams in which geomembranes have been usedAppendix 2 - list of geomembrane technology terms and definitionsAppendix 3 - the leading references on testing standards and on the use of geomembranes and their application on various dams.