Study on the uniaxial compression mechanical properties of rocks with pre-existing fracture under acid corrosion

Abstract

Abstract: To investigate the effect of prefabricated fracture inclination angle on the uniaxial compression performance of sandstone containing fractures under acid corrosion, dipping experiments in pH=2, uniaxial compression test, and crack propagation were simulated using Weibull distribution finite element model. The results indicated that the mechanical properties of specimens with low-angle cracks (0° and 30°) significantly deteriorate after acid corrosion, and the failure mode change from single tensile failure to shear tensile mixed failure. The dissolution of the cement lead to the weakening of the internal structure. In contrast, specimens of high-angle cracks (45°, 60°) exhibit non-monotonic response in compressive strength enhancement due to passivation of crack tips and formation of shear crack networks. The numerical simulation is consistent with the experimental results, revealing that acid corrosion regulates the failure process through mineral dissolution, stress field redistribution, and crack closure effects. An increase in Poisson’s ratio indicates a decrease in rock brittleness.

Key words: acid corrosion, uniaxial compression, crack inclination angle, numerical simulation, damage model

CLC Number:

TB301

SHENG Jie, LEI Rong, TANG Xing-chang, ZOU Ren, WU Yun-peng, GAO Qi-dong. Study on the uniaxial compression mechanical properties of rocks with pre-existing fracture under acid corrosion[J]. Journal of Lanzhou University of Technology, 2025, 51(6): 18-28.

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