2024-03-02 00:00:00 SimTunnel is designed to perform a quick tunnel analysis on your phone device. SimTunnel is very simple and easy to use. SimTunnel uses "rock-support interaction" or "convergence-confinement" method to estimate the deformation of circular tunnels in weak rock, and visualizing the tunnel interaction with various support systems. SimTunnel has the following features: - SimTunnel determines Factor of Safety (FOS) as the ratio of maximum support pressure to the support pressure required for equilibrium.