<p>As a critical load-bearing component in suspension bridges, the tunnel-type anchorage (TTA) possesses a complex load-bearing mechanism and is highly susceptible to the geological environment. Nevertheless, the impact of acidic corrosion on its stability and load-transfer mechanism remains inadequately explored. Utilizing a case study of a suspension bridge in Guizhou, this research employed an integrated approach, which encompassed laboratory acid corrosion testing, X-ray diffraction (XRD), triaxial compression tests, and numerical modeling to investigate the consequences of chemical corrosion on the physico-mechanical properties of limestone and the consequent stability of the TTA. The results indicate that acidic corrosion significantly degrades the mechanical properties of limestone, with the degree of deterioration in the elastic modulus (<i>E</i>), cohesion (<i>c</i>) and internal friction angle (<i>φ</i>) increasing as the pH value decreases. A decrease in pH causes the wedge-shaped tensile stress zone in the TTA to expand upward and outward, which greatly impairs the structural stability of the TTA. Under overload conditions (≤ 10p), the influence of pH on TTA deformation is more pronounced than that of the applied load; the combined effect of increasing load and decreasing pH further promotes the expansion of the plastic zone in the surrounding rock. At a pH value of 3 and a load of 10p, a penetrating wedge-shaped plastic zone is formed in the surrounding rock, indicating the structural failure of the TTA, with its safety factor falling below 10.0. These findings provide a theoretical basis for optimizing the design and construction control of TTAs in acidic groundwater environments.</p>