Studies of the small leakage in buried gas pipeline under the condition of soil properties

Analyzing the characteristics of the gas diffusion in soil porous media, and using proper coefficient to correct the calculation model of aerial pipeline leakage, with which to establish the diffusion model of buried gas pipeline. Combined with the mass conservation equation, fick diffusion equation and relative diffusion coefficient equation to build three-dimensional steady-state diffusion model. Then using dimensionless analysis method to calculate the diffusion equation. Through example analysis to research gas concentration fluctuations with the change of buried depth, aperture size, soil properties. Get the rule of small aperture leakage under the condition of different soil properties and rainfall, and it can be used as reference basis for scientific positioning and adopting emergency measures.