Mathematical Model of Rockmass Behaviour in Underground Coal Gasification National Mining University Vasil Lozynskyy Vasil Lozynskyy Research supervisor V.S Falshtynskyy Language adviser N.M Nechay

IMPORTANT PROBLEM

The height of caving zone after BUCG Subsidence h п is defined from expression : h п = (0.5…0.6)m в – m з - h; м, where m B – coal seam power, m; m З – power of ashslags layer, m; = СЛ.П.. К B rocks power increasing by swelling, m; сл.п.- power of pile swelling rocks, m where m B – coal seam power, m; m З – power of ashslags layer, m; h = h СЛ.П.. К B rocks power increasing by swelling, m; h сл.п.- power of pile swelling rocks, m Swelling coefficient in dependencies of rocks composition and temperature Chemi- cal compo- sition Rocks indexes %Heat up temperature, 0 C Swelling rocks Non swelling rocks SiO 2 62, ,151,451,481,71 Al 2 O 3 SiO 2 0,2-0,41 0,411,01,11,181,35 C0,6-4,2 4,21,01,21,321,53

Load distribution on rocks layer above underground gasgenerator in BUCCG: а – area 1, seam С 5, b – area 4, seam С 4, c- area5, seam С в 10, d- area 7, seam С 6. a b c d

Dependencies of rocks pile in rockmass above underground gasgenerator Change of pile parameters during BUCG Length of gasgenerator channel, m Spread of long wall movement, m / d 0,51,01,5 h max, mm V p max, m 3 V p min m 3 h max, mm V p max, m 3 V p min m 3 h max, mm V p max, m 3 V p min m

Rocks of roof and footwall mowing by the geomechanical and thermodynamic factor during underground gasgenerator U,мм. L, м. Т, мм. Y,мм U,мм. L, м Т,0С I II III U,мм. L, м

Parameters of heating the rock mass above the gas generator (test bench research) а б Degree of heating the rock mass of the roof (а) and ground(б): 1 – oxygen enriched blast (О 2 – 30%), pressure P = 0,4 МПа, row 4; 2 – air blast, pressureР = 0,6 МПа, row 2; 3 – air blast, pressure Р = 0,4 МПа.