Integrated analysis of geofiltrational parameters in the context of underground coal gasification relying upon calculations and modeling

Abstract

Objective of the paper is to substantiate and implement the integrated approach aimed at the studies of filtration and mass-transfer processes within roof rocks of coal seams in the context of their underground gasification. Integrity of the studies is substantiated by the use of analytical calculations as well as physical and numerical modeling. Zones with different permeability have been determined and values of specific water inflow have been identified basing upon the performed numerical modeling and involving multicomponent transformations within roof formation. The research data actuality is in the studies of spatial and temporal dynamics of rock technogenic rock permeability above gasification channel depending upon their geological structure which will favour the substantiation of efficient engineering solutions to control a process of underground coal gasification under difficult hydrogeological conditions.

Determining patterns of the geomechanical factors influence on the fastening system loading in the preparatory mine workings

“…Bthe width of mine working during driving; γthe weight-average unit specific gravity of rocks in the dome of natural equilibrium; α1 and α2parameters, setting the ratio between the lowering of the mine working roof in the areas: outside the zone of the stope works influence; in the zone of frontal bearing pressure of approaching longwall face; behind the stope face in the zone of stabilization of the rock pressure manifestations. The parameters α1 and α2 have been obtained based on the calculated expressions [26], by transforming them for the solvable task of determining the function q2(u):…”

Studying aerodynamic resistance of a stope involving CAD packages modeling

“…-differential equation of the flow continuity: According to the Safety Rules [6,8,15], velocity of air motion in a stope is limited:…”

Analysis of the stress distribution changes in the rock mass including coupling of extractive and development workings while variating the geometric laying parameters

“…Если при высоте пресекаемых пород 0,5 м деформации кровли выработки соизмеримы для бутовых полос и сплошной закладки, то для 0,6 и 0,7 м эти деформации увеличиваются на 12 -15 %. Следовательно, крепь выемочной выработки воспринимает возросшее боковое давление, что ухудшает ее эксплуатационные характеристики [10,11].…”

“…Это указывает на возмож-ность формирования многоуровневой блочной системы разрушения слоистого породного массива кровли очистной выработки [10]. При этом высота и ширина блоков определяется комбинацией высоты породных слоев кровли очистной выработки и абсолютной величиной градиента полных деформаций [7,11].…”