Abstract:

In order to describe the influence of goaf-side entry retaining air leakage on goaf gas migration laws,simulated the broken expand coefficient along with the changed advancing distance by using UDEC numerical simulation software,Based on the theory of Computational Fluid Dynamics to built the mathematical-physical model,By using Fluent numerical simulation software simulated the goaf gas migration law when goaf-side entry retaining air leakage, and analyzed the influence on the range of oxidization combustion zone.It suggests that the influence of goaf-side entry retaining air leakage increased the strengthen of face air leakage,speeded up the gas migration along the the strike and the inclination direction of goaf,enlarged the range of goaf oxidization combustion zone and increased the possibility of goaf coal spontaneous combustion.

Key words: goaf-side entry retaining, gas migration, broken expand coefficient, Fluent, oxidization combustion zone