Development and application of a dynamic XFEM for the seismic residual displacement analysis of an embankmentстатья из журнала
Аннотация: Newmark's method is a simple engineering method that uses only an input seismic wave and certain other parameters for a slope stability analysis. However, there are several problems with Newmark's method that are caused by the assumption of rigid body dynamics. For example, the method cannot take into account non-arc-shaped sliding surfaces, seismic response acceleration, the deformation of sliding blocks, or pore pressure. By increasing the prediction accuracy of the residual displacement, we believe that an analysis method can represent these important geo-material properties for disaster reduction and disaster prevention. The aim of this paper is to overcome these problems by means of a new numerical technique developed by the author and based on the dynamic extended finite element method (X-FEM). The proposed method takes into account the deformation of sliding blocks, multiple sliding surfaces, and the seismic response acceleration at nonspecific locations. In this paper, several approaches are examined to validate the proposed method. Specifically, the method is compared to Newmark's method, a multiple sliding surfaces model, a method including the effect of using elastic moduli, and an inverse analysis. It is found that the proposed method can calculate results similar to those of Newmark's method when using a highly elastic modulus material. In addition, it is also found that there are different residual displacements between single and multiple sliding surfaces. These results indicate that the careful selection of a sliding surface should be made when considering multiple sliding surfaces. Furthermore, the proposed method shows that the displacement of a soft embankment is greater than the displacement of a relatively hard embankment. Finally, an inverse analysis of a road embankment failure, caused by the 2007 Noto Hanto earthquake, is examined. The proposed method shows that the residual displacement is reproducible.
Год издания: 2017
Авторы: Taiki Shimbo
Издательство: Elsevier BV
Источник: SOILS AND FOUNDATIONS
Ключевые слова: Geotechnical Engineering and Analysis, Dam Engineering and Safety, Numerical methods in engineering
Открытый доступ: hybrid
Том: 57
Выпуск: 3
Страницы: 357–370