Fig. 16From: Large-scale inflatable structures for tunnel protection: a review of the Resilient Tunnel Plug projectPhase 2b-ET, full-scale testing, and three-layer Vectran plug. Initial inflation and holding of membrane material by passive restrainers (top). For additional details see [[69]92,93,94]. Cross-section of finite element simulation of initial inflation and sequence membrane release upon breakage of passive restrainers [45,46,47]Back to article page