Deformation Characteristics, Induced Mechanism and Deformation Pattern of Reservoir Bank Slope Based on Long‐Term Monitoring: A Case Study

This study investigated the deformation behaviours, trigger mechanism and deformation pattern of Dawanzi (DWZ) slope, a bedding rock structure in the Baihetan reservoir area, based on the field geology surveys, site monitoring and geospatial statistical analysis methods. Monitoring results indicated that the displacement behaviours of measuring points TP01 and TP02 near the DWZ tunnel entrance area exhibited a creep deformation stage, while data from the other monitoring points remained stable, thereby confirming the effectiveness of the emergency anti‐slide pile reinforcement. Furthermore, the correlations between slope stability and slope structure, gradient and lithology were analysed based on the statistical characteristics of 28 historical landslides in the Baihetan reservoir area. The statistical results revealed that the DWZ slope is a bedding rock slope with an inclination of approximately 35° and a lithology characterised by a soft‐hard interbedded sequence primarily composed of siltstone, silty mudstone and argillaceous dolomite, identifying it as a prone stratum. The rapid rise of the water level triggered bank collapse at the leading edge of the DWZ slope, which subsequently pulled the trailing edge rock mass forward along the slope, leading to continued deformation. The displacement normalisation method was applied to analyse the deformation pattern, indicating that the slope is currently in a steady‐state deformation stage. This study provides a theoretical reference for the prevention and control of geological disasters in the reservoir area.