<p>Karst geological bodies have undergone long-term hydrochemical corrosion. During tunnel excavation, affected by low-frequency, low-amplitude stress wave-induced micro-dynamic disturbance, the combined effects of directional dynamic disturbance sources varying with excavation zones and the heterogeneous distribution of rock mass discontinuities further dominate the deformation and failure of such geological bodies. Specifically, rock mass discontinuities are subjected to multi-directional disturbances, which can lead to their failure and even trigger geological disasters. However, the effects of disturbance direction on the mechanical behaviors of rock mass discontinuities under three-dimensional (3D) stress conditions remain unclear. Therefore, it is of great significance to carry out in-depth research on the mechanical response characteristics of rock mass discontinuities under the coupling action of 3D stress and multi-directional dynamic disturbance, which can provide a reliable theoretical basis for the safe construction of tunnels in karst areas. Therefore, this study conducted true triaxial shear disturbance experiments on the discontinuities of corroded limestone specimens under different normal stress levels and disturbance directions, so as to systematically analyze their strength characteristics, deformation behaviors, disturbance-induced shear strain rates, and damage evolution processes. This study investigates the effects of directional disturbance stress on the shear energy evolution and roughness anisotropy during the failure process of corroded discontinuities. Key findings indicate that the peak shear stress (τₚ) and residual shear stress (<i>τ</i>_c) increase linearly with normal stress, with significant directional dependency (shear direction &gt; lateral direction &gt; normal disturbance direction). Notably, the anisotropic characteristics of discontinuities remained consistent under varying normal stress levels within the same disturbance direction but diverged markedly across different disturbance directions, accompanied by distinct roughness distributions. Furthermore, the disturbance strain energy was the highest under normal disturbance, followed by that under lateral and shear directions, whereas the proportion of dissipated energy exhibited an inverse trend. Although the deformation increments before failure were minimal, acoustic emission (AE) precursors were pronounced: specifically, the fractal dimensions declined steadily, the b-values plummeted to low levels, and the dominant low-frequency/high-amplitude signals emerged abruptly prior to failure.</p>