Soil　and　rock　mixture　(SRM)　is　complex　geological　material　that　frequently　leads　to　ground　collapses,　landslides,　and　debris　flows.　The　mechanical　and　hydraulic　properties　of　SRM　have　consistently　attracted　extensive　attention.　However,　due　to　the　presence　of　both　large　and　small　rock　blocks,　both　experimental　investigations　and　traditional　mesh　based　numerical　methods　face　significant　challenges　in　the　accurate　evaluation　of　SRM　mechanical　properties.　The　numerical　manifold　method　(NMM)　is　an　excellent　choice　for　this　purpose　as　it　effectively　overcomes　obstacles　to　mesh　generation　of　complex　SRM.　Before　exploring　the　hydraulic　properties　of　SRM　by　NMM,　it　is　necessary　to　construct　a　random　preserved　structure　model　of　SRM,　where　the　rock　blocks　are　randomly　distributed　in　space　under　a　seismic　load,　which　is　a　primary　cause　of　structural　changes　in　SRM.　Using　an　explicit　iterative　scheme　called　the　continuous-discontinuous　element　method　(CDEM),　we　simulated　the　redistribution　of　rock　blocks　in　SRM　under　artificial　or　natural　seismic　loads.　Finally,　we　concentrated　on　determining　the　influences　of　some　factors　on　SRM　permeability　using　three-dimensional　numerical　manifold　method　(3D-NMM).