Abstract:The large area mining and backfilling without intervening pillar has been successfully used in Jinchuan No.2 mine area.Now,there are two mining levels,respectively,the upper level and the down level,a level pillar has formed between them.In recent years,severe structural distortion has appeared in the hanging wall roadway at 1178 m level besides the drifts at other levels in hanging wall.Based on considering the tectonic stress field and mining disturbance,a two dimensional finite element model was established to analyze the coupling effects between the level pillar and strike roadway at different level.In simulations of model,the level pillar,in which the stress concentration in the direction across vein increases with the advance of mining,has a "counteractive effect" on the hanging wall roadway,it is the main factor causing the severe structural distortion of the roadway at 1178 m level.In 2005,it was predicted that the "counteractive effect" would gradually become weaker with the appearance of the entire yield destruct situation of the level pillar,so the deformation and failure of the roadway planed to be constructed at 1158 m level would be less than that of the roadway at 1178 m.The prediction has already been proved by the results from in-situ observations.