The prediction of the hazard caused by weighting over great extent of top layer in mine worked-out section area;

Study on the rule caused by roof fall over great extent of worked-out area in mine;

The disaster of stope roof falling over great extent, happening in the coal face during the course of mining, brings about such comprehensive destruction as energy damage, load lash and cyclone damage.

Roof control technology for large unsupported roof at face end of coal mining face;