n order to study Si he Mine 2nd Temple wells IX4302 island face “two hard” rock (hard roof and hard bottom) under geological conditions Strata Behaviors for the safe and efficient mining face similar reference. Firstly, similar to the simulation results overlying strata movement and Strata Behaviors and guides used in engineering practice, and through on-site mine pressure line monitoring and roadway deformation observed, studied law and periodic pressure face abutment pressure range, both complement each other confirmed. The results show that, due to the small mining height face, by the "two hard" rock island in the form of greater impact, periodic weighting obvious, but not strong, basic roof first weighting step distance of 45.7m, periodic weighting from an average of 16.4m; abutment pressure in front of 11m at the coal wall, roadway deformation.
