Objective Due to the impact of highway construction, geological hazards along roadways occur frequently. The susceptibility evaluation of geological hazards along roadways is a key issue in emergency response and rescue. The evaluation results can provide a scientific basis for disaster prevention and emergency decision-making, helping to mitigate potential losses caused by such hazards.

Methods Along the G219 Highway in Zayu County, 85 geological disaster sites were identified (including 9 landslides, 31 collapses, and 45 debris flows). Based on the developmental characteristics of geological disasters, 11 influencing factors were selected as evaluation indicators: drainage density, road density, peak ground acceleration, seismic response spectrum characteristics, rock groups, geomorphology, DEM, plan curvature, profile curvature, aspect, and slope. A modified information value model combining geological disaster kernel density analysis with the information value method was developed. GIS technology was applied to evaluate the susceptibility of geological disasters in the study area.

Results The results show that the susceptibility evaluation based on the modified information value model aligns closely with the actual distribution of geological disasters. The model demonstrated high predictive accuracy, with an AUC value of 0.836, indicating its significant capability in assessing geological disaster susceptibility.

Conclusions The modified information value model provides superior evaluation accuracy and offers reliable scientific support for urban planning, construction, and geological disaster risk management in Zayu County and surrounding areas.