Simulation and Research on High-level Gas Drainage Tunnel Design Parameter of 2103 working face in Changcun coal mine

The 470 level single coal seam working face of Changcun coal mine is designed of two intake airway and two outtake airway which causes a large amount of coal loss and low gas drainage efficiency. The paper uses FLAC3 D to simulate the damage rule of upper and middle overlying strata,determines the location of the key strata which plays an important role of overburden fracture development and distribution in the 3#coal seam; uses UDEC to simulate the rule of middle and upper strata fracture development and distribution,gets the location of fracture zone towards the direction of work face and the location of vertical fracture zone. According to the feild test results of fissure zone near 2103 working face,the relationship curve between height and vertical face of overburden caving zone,fracture zone and fractured zone in 3#coal seam is fitted. The designing parameters of high- level gas drainage tunnel of 2103 working face are determined according to FLAC3 D,UDEC and field test results.