The Research and Application of The Hard Roofs Forced Caving Technology in Short Wall Stopes

Based on the analysis of the hard roofs movement law in the a mine short wall stope, a kind of caving technology combining the deep hole blasting and the shallow hole blasting is put forward. The advantage of this technology is to set deep hole blastholes in connection drifts so that the blasting down coal gangues fill completely the goaf under blastholes and isolate the working face from the goaf. For cutting fractures on roofs, shallow hole blastholes are set in the slices intraocular of sections, which changes the mechanical structures of roofs, reduces the limit hanging distances of the original roofs and makes roofs acaving under the mining pressure. This technology realized the roofs safety caving of the short wall stope and good filling of goafs, which can provide reference for similar working face mining.