Abstract
For the evaluation of mechanical behavior of masonry structures, application of discontinuum-based numerical methods is gaining its imporatance in recent years. However, to investigate the stability of the masonry structures constructed on the soil, it is necessary to consider the deformation and hydraulic behaviors of the foundation ground as well as the discrete behavior of the stones. For example, in the Angkor ruins of Cambodia, there are many structures damaged due to ground instability induced by rainfall infiltration, and the rational stability evaluation method is required for future conservations. In this study, the coupled code of Numerical Manifold Method and Discontinous Deformation Analysis (NMM-DDA), a discontinuum-based numerical method, was extended with simplified three-phase mixture theory for the unsaturated soil, and an analysis method for mechanical interaction between unsaturated soil and masonry structure was newly developed. After the validation study through the simulation of model test and analytical solutions, a seepage problem of a masonry structure foundation was also carried out as an example problem.
