Determination of Rational Staggered Distance Between Double-Longwall Faces in Mining Operation On Confined Aquifer

摘要

The influence of staggered distance on the failure of floor bed is locally and temporarily defined in double-longwall mining on the confined aquifer. When the longwall mining reaches a certain scale, the deepest failure of floor bed depends on macroscopic technological parameters of mining and geo- logical conditions. The temporary as well as the terminal failure depth does not change with the min- ing staggered distance (5～30 m). Based on the mining and geological conditions on the 2 635 double longwall mining panel of Yangzhuang coal Mine, the changes of abutment pressure was observed and numerically simulated. The result shows that the rational staggered distance should be not more than 10 m.