Analyzing the Stability of a High-Fill Slope based on Spatial Survey Information

Stabilizing high-fill slopes for mountainous airports in China is a significant geotechnical engineering challenge and needs to be resolved for airport construction to go ahead. This paper presents a dynamic stability analysis of the #13 landslide at Panzhihua Airport in Panzhihua City, China. Based on spatial survey information from a surface survey, surface monitoring, deep hole drilling, and geophysical exploration, numerical analysis was used to back-analyze the mechanical parameters of the slope. The FLAC3D method was used to analyze the stability for two profiles of the landslide, and the numerical analysis was associated with a strength reduction method to ensure the reliability of the mechanical parameters. Finally, based on a geological field investigation, the obtained mechanical parameters were used for the stability analysis of a three-dimensional slope. The analysis results were in good agreement with the field observations. These results indicate that an analysis method based on spatial survey information is feasible. This method not only helps reflect the sliding mechanism and predict the deformation development tendency, but also can effectively compensate for the deficiencies of field investigations by providing the necessary supplementary information.