<p>Modern underground engineering support design generally considers the synergistic support relationship between the surrounding rock and the support system. In underground engineering involving soluble rocks, primarily limestone, dissolution has a long-term impact on the deterioration of limestone-bolt combined support characteristics. This study focuses on the limestone-bolt combined support structure at different stages of fissure development and varying dissolution time. Considering the mechanical deterioration mechanism of limestone under the effect of dissolution, it employs self-developed equipment to conduct a series of experimental studies. The research verifies that the detrimental impact of dissolution on the deterioration of limestone-bolt combined support characteristics cannot be overlooked. The analysis reveals the differences in the extent of deterioration of the limestone-bolt combined support structure under different stages of fissure development and varying dissolution time. Furthermore, the study uncovers the deterioration mechanism of the limestone-bolt combined support characteristics under the influence of dissolution. The study can provide important physical basis for the development of the construction scheme and the optimization of stability of surrounding rock in underground engineering in soluble rocks.</p>