Behaviour and design of cured in place liners in noncircular corrugated steel culverts

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Across Canada, tens of thousands of old corrugated steel culverts and sewers require rehabilitation or replacement. Cured in place pipe (CIPP) liners are now well established rehabilitation options for concrete and clay storm and sanitary sewers. However, there is no established design method for CIPP liners installed within corrugated steel sewers and culverts: the procedures in ASTM F1216 used for CIPP liners within rigid sewers are not suitable, because they a. are only for circular or almost circular structures, b. neglect vehicle loads. This project involves four phases: a literature review, full scale testing to investigate liner response to vehicle loads, further testing to study liner resistance to external fluid loads, and development of design procedures. The second phase involves burying two corrugated steel pipes with elliptical geometry in the GeoEngineering Laboratory at Queen's. One culvert will be lined using a conventional CIPP resin-impregnated felt liner, and the other using fibre-reinforced, UV cured liner. Performance testing under simulated vehicle loads will be conducted before and after repair. Measurements will establish how thrust and moment develop in the liners and the old steel structure, and the nature of the liner-steel culvert- soil interactions. Final tests on each lined culvert will increase surface load until strength is fully mobilized, to establish the failure mechanisms. These will be the first tests of their kind ever performed.During the third stage, two further samples of the same CIPP liner types will be tested under external fluid pressure to measure, for the first time, buckling strength of liners within these kinds of steel culverts.The final stage of the project will involve use of finite element analyses to interpret the test observations, and to develop design methods for use in selecting suitable liner thicknesses and polymer properties. Two PhD students will be trained and there will be active participation of the research partner (a specialist rehabilitation contractor) who will subsequently use the design methods for culvert projects across Canada.