| 摘要 |
FIELD: mining.SUBSTANCE: as face advances from special chambers passed above preparatory minings on the side of extraction galleries there drilled opposite each other are wells parallel to formation at the distance from lower plane of the main roof to wells, which is determined by the following formula: L=l(1+?K) / (K-1), where K- rock loosening coefficient of the main roof at their blasting with loosening; l- distance from the main roof to fallen rocks, m; l- line of least resistance of blasting cone, m. Then, they are charged and blasted after the support line in the worked-out space. At each explosion there created is support from roof rocks fallen out of funnels throughout the face length, by means of which free falling of main roof, which is torn by explosion, is prevented.EFFECT: considerable increase in mining of gas-bearing formations by means of mechanised complexes in wide range of coal bed in bedding zone of coal formations.4 dwg |
