Analysis on room-crevice phenomenon in Qiwu Mining District

The calculation method of mining subsidence is used to determine the mining influence scope to investigate the relation-ship between room-crevice phenomenon and subsurface mining in Qiwu mining district.Based on comprehensive comparison and analysis of geologic conditions and mining method,reasonable calculation parameters are determined,the final boundary of mining influence is detemined with adjustment for calculated boundary and the boundary determined with other method.The result confirmed that there is no relationship between room crevice and subsurface mining.The analysis indicated that the room crevice is caused by regional structure movement,engineering geology and building quality.