Abstract: Given the frequent occurrence,persistent nature,and unclear mechanisms of collapsed gully disasters in southern China,this study focuses on the disintegration characteristics of granite residual soil in collapsed gully areas. By adjusting the oven temperature to control the drying process,soil samples were conditioned to different initial moisture contents. Disintegration tests were conducted to analyze the variation patterns of disintegration characteristic parameters of residual soil under three drying temperatures and five initial moisture content conditions. The results indicated that the disintegration rate curves of residual soil in collapsed gully areas could be generally categorized into three types. Drying treatment increased the final disintegration rate of the soil,thus promoting the disintegration process. The average disintegration rate was influenced by both the drying temperature and the initial moisture content. At a drying temperature of 35 ℃,the average disintegration rate showed a relatively flat trend with increasing moisture content. When the drying temperature exceeded 55 ℃,the average disintegration rate rose rapidly with increasing moisture content. Under a fixed drying temperature,the average disintegration rate gradually decreased with increasing initial moisture content,exhibiting a"rapid decline—gradual decrease" trend. The findings provide valuable insights into the disintegration characteristics of residual soil in collapsed gully areas,offering scientific support for predicting,controlling,and comprehensively managing collapsed gully disasters.