Analysis on mechanical properties and evolution of mesostructure of soil–rock mixture samples from contact network perspective

Based on discrete element method (DEM), three kinds of soil–rock mixture (SRM) models with different coarse particle contents were established and triaxial compression tests carried out. The results show that the force chains in system playing main bearing role need more lateral supports, which contact a higher coordination number often bear larger force. relationship between contact’s carrying capacity can be fit by quadric surface. Taking surface as function, network-flow model transfer constructed to quantify ability network. By connecting maximum flow network hardening parameter unified model, stress–strain SRM predicted some extent, lays basis for formulating micro–macro constitutive granular materials.