| 摘要 |
FIELD: mining. ^ SUBSTANCE: procedure consists in boring boreholes in weakened massif through mined sublevel, in cutting initiating fissures on walls of said boreholes, in fussure sealing and in forming cracks of coal hydraulic break by pressurising fluid into them. A successive initiating fissure is cut simultaneously with preceding initiating fissure sealing and with forming a crack of hydraulic break in it. ^ EFFECT: raised efficiency of procedure due to reduced number of preparing operations, also reduced assortment of required equipment and time for part of operations. ^ 2 dwg |
