The Acidic Environment Of The Sandstone Strength, Deformation And The Nature Of Experimental Research

Based on the experiments of sandstone samples submerged in various acidsolution with different PH values, the macro mechanical behavior of thefeldspathic sandstone which is mainly cemented by calcium has been studied;the chemical reaction mechanism on the mechanical behavior changes has beenrevealed with analyzing the results of uniaxial compression test and CTmeasurements, considering the rock chemical composition and structurecharacteristics; then, the solution of the main cement of rock-CaC0₃ isconsidered as the reason of the reducing of rock strength. The strengthmodel of the rock in the acid solution has been established using chemicalkinetics theory and damage theory, by the EDTA titration test to test thesolution rate of CaC0₃ and the relative consumption of CaC0₃ to define thedamage variable; the evolvement equation of derege has been deduced at thesame time. Finally, the way of strength forcast under chemical damage hasbeen discussed in the factual rock in which the seepage and dispersion insolute transportation has been considered. 0ne idea or method has beengiven to predict one fact rock engineering's service time in this thesis.