Newmark's Method Considering Redivision of Sliding Mass

― Application to agricultural fill dam ―

Abstract

The deformation of an embankment is permitted to some extent in a level 2 earthquake-resistant inspection of an agricultural fill dam. Newmark's method is used to evaluate the deformation of an assumed sliding mass by calculating the angular acceleration using the driving moment and the resisting moment of a sliding mass around the center of the circular sliding surface in every time step of earthquake acceleration data. However, it is not considered that the driving moment becomes small by the movement of the sliding mass. Hence, a new calculation process that the sliding mass is divided again and the driving moment and the resisting moment are calculated in every time step when the sliding mass moves was added to the Newmark's method in this study. As a result, it becomes clear that the driving moment becomes smaller gradually as sliding displacement becomes larger with the new process, and that the final sliding displacement without the new process becomes larger than that with it as the sliding displacement becomes large.