PROCESS PREVENTING GAS BLASTS IN WORKED-OUT SPACE OF BREAKAGE FACE IN COAL MINES Russian patent published in 2003 - IPC

FIELD: mining industry. SUBSTANCE: invention specifically refers to preventive measures used to diminish probability of blasts of dust-gas-air mixture in worked-put space and workings in coal mines adjacent to it. Process consists in periodic feed of stable foam into worked-out space behind powered support. Isolating bands of stable foam are formed behind powered support in worked-out space with distance L_st between them found from mathematical expression L_st = 0,5•L_mr (m); minimal width of bands being L_b≥2•m_t.t(m); where L_mr is step of roof caving, m; m_t.t is treated thickness of coal seam, m. EFFECT: diminished probability of gas blasts and improved control over air leaks into worked-out space. 2 dwg