Fuzzy comprehensive evaluation on the mechanical behavior of the central rock pillar between twin neighborhood tunnels

The stability evaluation of the central pillar between twin neighborhood tunnels is an important step in a tunnel construction process. In this paper an indicator system was proposed to evaluate the stability state of the central rock pillar between twin neighborhood tunnels; then an AHP (Analytic Hierarchy Process) model was constructed to calculate the weights of indicators; and finally, with fuzzy mathematic method, a fuzzy comprehensive evaluation model was set up to evaluate the stability state of the central rock pillar between twin neighborhood tunnels. Project cases showed that this method is practical and effective.