Research on Uniaxial Compression Mechanics of Diorite under Flowing Acidic Solution Scouring

The bedrock used for underground construction has obvious traces of hydrodynamic scouring damage, and the mechanical properties especially are severely damaged under a groundwater environment. On this basis, considering excavated various saturations, uniaxial compression test diorite is carried out. Meanwhile, scanning electron microscopy (SEM), energy spectroscopy (EDS) X-ray diffraction (XRD) in experiment. variation law elastic p-wave velocity microstructure response characteristics strength, deformation parameters rock different flow rates pH values analyzed detail. results indicate that: (1) Saturations with faster rate lower value cause greater relative changes longitudinal wave samples. (2) compressive strength samples treatment conditions showed decreasing trend. Compared dried samples, saturation field v = 300 mm·s−1 1 decreased by 46.08%, 35.67% 6.56 900 mm·s−1. (3) stronger acidity, longer action time causes apparent dense structure sample to be loose accompanied microcracks, which weakens its macromechanical properties. (4) Acid produce water–rock chemical physical effects on diorite, weaken connection force between mineral particles friction fracture surfaces, reduce modulus, increase Poisson’s ratio accelerate failure diorite.