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- W2552490945 abstract "Summary: A comprehensive evaluation procedure for the sealing and drainage of the two long tunnels through the Swiss alps is performed based on an order by AlpTransit Gotthard AG and BLS AlpTransit AG. Special influences such as high geothermal heat, high pressure of mountain mass, construction, and high expectations for the service life-time – 100 years – had to be considered. Compared with near-surface tunnels, the thermoplastic polymeric materials typically used at present are more highly stressed. Polymeric products combined to waterproofing systems (waterproofing membranes: PE, PE-Cop, PVC-P, drainage materials: PE, PP, PA, PES) were submitted by the applicants and tested in a 24 months program for their ageing resistance. Existing test methods were complemented by new procedures, e.g., by resistance at elevated temperatures and in oxygen -enriched water at elevated temperatures, respectively, compression creep tests between rough surfaces, behaviour under combined lateral compression and horizontal shear, and installation tests including construction of the conrete support shell. The most important results of the four test modules with preliminary conclusions will be detailed. The installation tests showed that the waterproofing membranes develop regular folds with small radii of curvature during construction and thus locally lead to high strains in the membranes. Since most products did not meet certain requirements, optimised systems are now re-evaluted in a shortened procedure." @default.
- W2552490945 created "2016-11-30" @default.
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- W2552490945 date "2002-01-01" @default.
- W2552490945 modified "2023-09-24" @default.
- W2552490945 title "The Sealing Of Deep-Seated Swiss Alpine Railway Tunnels New Evaluation Procedure For Waterproofing Systems" @default.
- W2552490945 hasPublicationYear "2002" @default.
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