Analysis Research On Air-flowing Field In Fully Mechanized Working Face Gob

For a long time, many researchers have pay attention on the gob disasters-gas emission and coal spontaneous combustion. Coal spontaneous combustion, gas accumulation and other local problems in gob have a direct relationship with the air-leakage motion in gob. In the fully mechanized coal working face ventilation, there will be some wind leaking into the gob at the face-end, and sometimes there are some other air-leakage sources in gob, such air-leakage is often coal spontaneous combustion and gas motion impetus. The traditional theory of mine safety ventilation mostly study the roadway and ventilation facilities of the mine ventilation system to solve the roadway or working face ventilation and safety issues based on the network flow safety theory which posed engineering hydrodynamics and ventilation network. With the development of the computational fluid dynamics and computer technology, it is directly able to reveal the disaster nature and mechanism, which the underground roadway outside space or the rock region is the research object based on rock mechanics, porous media flow dynamics and numerical simulation.In this article, It analyzed the stave rock' s distributed characteristic and dynamic evolved rule and obtained loosely stave rock crevice structure seepage characteristic in gob, which based on the stope overlying strata movement and roof deformation destruction rule of fully mechanized working face; and has conducted the numerical simulation research by using CFD software FLUENT based on finite volume method to the wind flowing rule; considering from the lost coal oxidation and gas discharge dilution function in gob simulated the spontaneous combustion "three-zone" distribution and dynamic change rule, provide one new method to analyze the spontaneous combustion in gob, the simulation result has the instruction function to the reality safety production and technology reform.