Study on the Micromechanical Properties and Damage Model of Granite under Hydrochemical Environments Based on Nanoindentation Tests

In this study, granite specimens were immersed in chemical solutions with varying pH levels for different durations. Following the immersion, nanoindentation tests were conducted to measure the micromechanical properties and analyze the damage degradation of quartz, feldspar, and mica within the corroded granite. The study investigated the evolution of the mechanical properties of these minerals as a function of corrosion time under different pH conditions, and quantitatively analyzed the impact of chemical solutions on the damage variables of both elastic modulus and hardness for different minerals. Furthermore, Scanning Electron Microscopy (SEM) was employed to observe the mineral characteristics and surface morphology of the granite after corrosion. Damage evolution equations for elastic modulus and hardness were established as functions of pH value and time. These findings reveal the micromechanical mechanism of granite mechanical property degradation induced by chemical corrosion from a micro-perspective.