@tunnel.engineering: A tunnel portal collapse. It is shocking to see how loading on the tunnel portal is underestimated. Adding poor construction practices on top of this will result in such a failure. #tunnelcollapse #tunnelfailure #tunnelportal #tunnelling #miningengineering #tunneling #tunnel #tunnelview #undergroundspace #tunel #collapse #geology #geologyrocks #geotechnicalengineering #tunnelengineering #tunnelling #tunnelingtechnique #tunnel #tunel #civilengineering #failure #collapse