Fractal Analysis of Tunnel Structural Damage Caused by High-Temperature and Explosion Impact

The tunnel is one of the most important components in modern underground engineering. Due to long and narrow shape constraints, it very easily results large-scale fire explosion when deflagration caused by accidents vehicles that transport dangerous goods tunnel. Previously, studies on damage lining high-temperature impacts these kinds disasters were often limited a discussion only influencing factor, either or explosion, but they rarely considered two factors simultaneously. In this work, properties full-size induced high temperature impact evaluated, concrete samples from whole arch selected for CT scanning. improved differential box-counting method was used fractal analysis images obtain damage-distribution structure under coupled factors: fire, deflagration.