Control Technology of Hard Roof in Rujigou Coal Mine

The immediate roof in Rujigou coal mine 32₂12(1) working face is missing, the main roof is gray coarse-grained quartz sandstone, dense and hard, a large area hanging arch in the mining process seriously threat to safety production of mine, which will damage support column and cause production halts. Through the research and application of hard roof control technology, using working face deep-hole + crossheading deep-hole blasting caving roof, the roof disaster of large-area roof weighting is successfully avoided. Precious experience and related technologies are accumulated.