Study on surrounding rock stress distribution and gas flow law of mining roadway in deep mine

in order to master the stress distribution status and statiliy of the surounding rock along the mine heading roadway in the deep mine, in combination with the ste monitoring and measurement.the lab est and the numeical analysis study method.the time and spacereation between the low level gateway as well as the orack development features of the coal and rock mass under the mining infutences were system aticly tudied.The field moniormgresuts s howed that with the cal mning face pushing forwar.the crack netwrkdistribution region of the cal nd rock mass would steadiy be developed to the mining drection and the overburden sratadirection. The stress disturbances would cause the gas fiow in a sinusoial type fucuation and the suppor pressure of th surounding rock would be steadly increased . Therefore, within adistance of 25 m to the cal mining face,the drlling for the gas drainage boreholes should be enhanced toform a gas drainage borehole group. Tne gas drainage from the seam was conducted to reduce the gas pressure and reduce thegas utburst dange. At th distance of 60 m to the coal mining fac,h efe ctve support structure should be applied to the support of the surrounding rock in order to ensure the stability of the surrounding rock.