Many issues in geological and geotechnical engineering are related to large deformation and failure, which are difficult to analyze and simulate by using regular method based on continuum mechanics (e.g. Finite Element Method). Dr. Chun Liu of Nanjing University developed the MatDEM software for the three-dimensional discrete element simulation. The software combines pro-processing, computing module, post-processing and very powerful functions for further development. Based on the innovative matrix computing of DEM and three-dimensional contact algorithm, the software may handle millions of elements in one GPU, which is 30 times faster than commercial software...