Comprehensive Detection and Treatmant Technology for Concealed Collapse Columm in Working Face

To counter the fact that the concealed collapse column in the working face may have adverse effect on safety production, CT imaging tehnique was applied to detect the scope of the collapse columns and TEM technique was applied to detect the water yield property of the collapse column, through the advance detection and scientific analysis and by taking water control measures, the influence of the collapse columm on the safety production was under effective control.