Xi ''an university of architecture and technology
Study on the corrosion mechanism of sandstone under acid rain environment and its mechanical property degradation law (41172237)
In order to broaden the research?of the microscopic characteristics between acid medium and sandstone, based on the digital core model and lattice Boltzmann equation, the paper carried out the simulation test of the acid corrosion process of sandstone, and analyzed the seepage characteristics of the sandstone under different acid environmental circumstances. Firstly, the structural changes of the mineral components in acid-corroded?sandstone?were studied by CT scanning.?Then, The seepage model of sandstone subjected to acid corrosion?was constructed?by the method of combining the digital core of acid-corroded sandstone?which is established by the visual image processing software Image J,?Avizo and the lattice Boltzmann theoretical equation, the change rules of the internal pore structure and seepage characteristics of sandstone in the process of acid corrosion?were analyzed. The results show that?the mineral composition,?pore distribution of sandstone?and the corrosion degree of sandstone by acidic solution?could be revealed by CT scan tests. The depth of penetration increases with the increase of porosity, the rate of increase is fast at first while slow when the porosity is large, finally it tends to be stable, it indicates that the seepage model based on Boltzmann equation is applicable?to simulate the?acid corrosion process of sandstone.