Analytical and Numerical Modelling of the Effects of Buttressing on Slide-Head Toppling Failure

Buttressing is a widely employed control measure for mitigating slope failure in various settings such as open pit mines, road sections, dams, and hilly or rocky terrains. This paper presents a study on the effects of buttressing specifically concerning slide-head toppling failure, considering the potential counter-tilting of the failure plane within the rock mass. Drawing insights from a case study of slide-head toppling in Zambia, our investigation employs both analytical (limit equilibrium) and numerical (3DEC software) modelling techniques. The analytical and numerical models exhibit notable similarities in their schematics and overall results, revealing a subtle effect of buttressing in controlling slide-head toppling failure. Despite the seemingly minimal impact, sensitivity analysis indicates that variations in buttress parameters could enhance its overall resistance against failure. Preliminary results suggest that an increase in the overall volume of the buttress, achieved through adjustments in height or horizontal length, correlates with an improved effectiveness of slope failure control. Further considerations have also been made for possibility of counter-tilting of the failure plane within the rockmass during slide-head toppling failure. This study contributes valuable insights into the nuanced role of buttressing in slope stability, with implications for optimizing buttress design parameters. While the overall findings suggest a modest influence of buttressing on slide-head toppling failure, further discussions delve into the specific implications and potential refinements for practical applications.