Numerical Simulation on Tunnelling Influence of Air Return Tunnel and Dedicated Gas Emission Tunnel

摘要

In order to research the influence between air return tunnel and dedicated gas emission tunnel to arrange the tunnels properly, numerical experimental model is established according to the exploitation technical conditions and mechanical properties of rocks of 32020 working face in Pingmei NO.5 mine. FLAC~(3D) is used to analysis the stress distribution among air return tunnel and dedicated gas emission tunnel with different interval thus confirm the most appropriate interval. By simulating the impact of gob to the tunnels, fully caving of the gob is helpful to reduce the outburst risk of coal and rock can be obtained. Variation of vertical stresses in two situations (dedicated gas emission tunnel driving along and air return tunnel driving first) is simulated respectively, thus obtain the safe distance of air return tunnel driving ahead. Research results can provide theoretical basis to control stress concentration, ensure emission efficiency and reduce tunnel construction so as to make safe and fast driving come true.