| For a long time, The problem of U-shaped ventilation working face upper corner gas overrun in exhausted gob which induce coal mine disasters is focused by Many scholars that engaged in coal mine safety technology research. So it is particularly important to research the law of gas flow and the gas distribution in exhausted gob, Because of the complex structure of coal and rock in exhausted gob, With normal measuring method to detect the condition and distribution law of gases is relatively difficult, So Many scholars using computational fluid dynamics (CFD),Through numerical simulation experimental research gas flow field in goaf. But most current study only focused on U-shaped ventilation system of mining working-face, With the Y-type ventilation type widely promotion, research on Y-type ventilation goaf gas flow field is become hot.This thesis based on the researching of Porous media theory, Comprehensively analysis the seepage rule and dispersion rule in porous media where the gas fluid within. Using computational fluid dynamics software to analysis the air pressure field, velocity field, the gas flow field in exhausted gob under Y type ventilation mode. Laid a theoretical basis on using and controlling methane for future.In this thesis the author discuess the current research of gas migration in goaf and the Pillarless mining, Analyzes the advantages and disadvantages of various ventilation system at present, Studied various factors which influence on gas emission in fully mechanized working face. In the process of research the author analysis the gas concentration dispersion and linear seepage formulas in exhausted gob, Then take some assumptions and simplified the gases and porous media in goaf, It is provide theory basis on study gas flow flied. The author exemplified 1311 (1) Y-type ventilation mining working face of Ding Ji coal mine, Analyzes the gas flow field in goaf. Meanwhile measured the distribution of gas flow field, The Theoretical study and practical are coincide. |
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