Study on the accumulation process of residual displacement by applying DDA in the Angkor monument Cambodia

摘要

In a dry masonry construction, such as the Angkor monument in Cambodia, a residual displacement, which has been accumulated over 1000 years after the construction, is assumed as the essential cause of a tower inclination and collapse. In this paper, applying the discontinuous deformation analysis, DDA, which includes an evaluation of the kinetic friction state after a slide generated between stones in formulization, we conducted a numerical analysis of the Angkor monument focusing on the accumulation process of the residual displacement. Applying DDA, a platform is modeled and the accumulation process of the residual displacement is verified. Then, we verified the relationship between the seasonal accumulation of residual displacement of the platform and the tower inclination, focusing on the phenomenon that the rainy season and the dry season come in the cycle of one year. In addition, to reduce the calculation cost of DDA, we applied a parallel computing to the DDA. Using Microsoft HPC Server 2008 for parallel computing, a numerical analysis of Prasat Suor Prat tower, reflecting the characteristic of masonry construction, was conducted and we compared the displacement and stress distribution calculated by DDA and FEM.