Numerical Simulation Study On The Flow Field And Gas Migration Rule In Goaf

Gas in goaf is one of the main factors affecting coal mine safety production,goaf gas prevention and control work is the priority among priorities in the coal minesafety work, facts prove that similar techniques are provided to numerical simulationof material experiment and computer to carry out mining area gas prevention andcontrol air as working face. The results of this study summarized the domestic law ofmining face goaf flow field and gas migration, research results show that, the mainfactors affecting goaf flow field and gas migration is the ventilation conditions, goafporosity distribution, pressure step. Based on this, this paper combined with thesimilar material experiment and computer numerical simulation, system analysis ofthe different wind speed conditions, different goaf porosity values and differentweighting of fully mechanized working face case law in goaf flow field and gasmigration.In this paper, using theoretical analysis, numerical simulation, similar materiallaboratory field and computer simulation studies of the tight-binding method, thecomputational fluid dynamics, a basic mathematical model of porous media seepagemechanics theory, established a fully mechanized mining face goaf gas seepage,three-dimensional numerical model is established in fully mechanized mining facegoaf gas seepage using FLUENT software. Firstly, different ventilation conditionsporosity of uniform distribution of goaf flow field distribution were similar materialsimulation laboratory, first and then the different wind speed conditions, differentgoaf porosity values and different pressure step case of goaf flow field and gasmigration in the numerical simulation, comparison and analysis of the different windspeed conditions, different goaf porosity values and different weighting of fullymechanized working face under the condition of goaf flow field and gas distributionlaw, computer numerical simulation provides a theoretical basis for the correctunderstanding of goaf flow field and gas migration law，and provide a theoreticalbasis and guidance for mining area gas prevention and control of air, has animportant significance to the study of disaster prevention technology and securitytheory, have certain realistic directive significance to the prevention and control ofgas outburst in coal mine production in the process of reality of0401fully mechanized face, and at the same time, to understand the goaf gas distribution,migration, emission law also has certain theory value.