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Table 3 Summary of the number of tests per phase and scale of testing

From: Large-scale inflatable structures for tunnel protection: a review of the Resilient Tunnel Plug project

Membrane Design Single Layer Three Layer Totals
Testing Category Phase 1 Phase 2 Phase 2b Phase 2b-ET Phase 3
Material Testing Tensile testing 32 90 9 9 21 426
Friction Testing 60 120 60   15
Shear Testing   3 5   
Flammability Testing   1    1
Reduced-Scale Testing Low-pressure air inflations (1:5.7) 6      202
Low-pressure air inflations (1:4)   5 3 3  
Full Pressure/Flooding Simulation (1:4)   50 35 100  
Full-Scale Testing Low pressure air inflations b 10a 12 11 19   109
Low pressure air inflations c 1a 3 10 6 22
Full Pressure/Flooding Simulation c   3d 3 2 7
  1. Notes: a Preparation tests in the lab plus demonstration test in the tail tunnel with the same prototype; b Surrogate plug; c Final testing prototype; d Plug pressurization only, no tunnel flooding. Results compiled from results reported in Molina (2008) [70]; Martinez et al. (2012) [42]; Barbero et al., (2013) [43, 44], Sill et al. (2013) [84]; Peil et al. (2014) [90]; Sosa et al. (2014, 2017) [69, 88, 89];