Comparative study on the mine pressure appearance in the static and dynamic pressure roadway

The paper takes the mining and supporting of 14^-1103 longwall panel and the supporting of the 14^-1107 excavation roadway in Zhengli Coal Mine as example.With respect to the features of hard roof of Zhengli Coal Mine,the strata-pressure behavior of dynamic pressure roadway and static pressure roadway was respectively studied on the basis of the filed monitoring.Based on the monitoring results,the support system is anticipated to be optimized.The study suggested that there is no significant difference between the dynamic pressure roadway and static pressure roadway in the range of 110m away from the mining face.Meanwhile,a liner relationship between bolts pressure and distance to mining face is revealed.However,an exponential relationship between the bolts pressure and distance to mining face is presented in the range of 30m away from the mining face.In this scope,the bolts pressure sharply increased approximate 70kN in dynamic roadway.However,this pressure of static roadway remained liner growth,and the maximum growth rate is about 0.5kN/d and the maximum increment is 8kN.