Properties of waterproof sprayed concrete tunnel linings: A study of EVA-based sprayed membranes for waterproofing of rail and road tunnels in hard rock and cold climate

Abstract

Investigate the long term effects of exposure of the SCL lining to higher ground water pressure, particularly the exposure of the membrane to pressurized water at cracks Investigate the effects of slow deformations and slow thermal fluctuations in order to complement the finding from short-term accelerated testing the mechanical performance parameters Investigate the longitudinal thermal profile of selected tunnels, combined with thermal monitoring in the lining and rock mass in areas with severe freezing for precise recommendation of areas of use for this lining system Improve constructability details for the application process of the membrane Develop improved sprayable membrane materials which are less sensitive to exposure to liquid water Develop specifications for excavation, support and pre-grouting of rock tunnels which increase the feasibility of the waterproof SCL system. This includes careful contour blasting, required watertightness achieved by pre-grouting and sprayed concrete mix designs and application in order to produce a suitable substrate