Since　invented　in　2003,　rock-filled　concrete　(RFC)　has　gained　much　attention　and　has　been　successfully　applied　in　more　and　more　civil　and　hydraulic　projects　in　China.　This　study　developed　a　numerical　framework　to　simulate　self-compacting　concrete　(SCC)　flows　in　the　voids　among　rocks　of　RFC,　which　couples　the　lattice　Boltzmann　method　and　discrete　element　method　(DEM).　The　multiple-relaxation-time　scheme　is　used　to　simulate　self-compacting　mortar　(SCM)　for　better　stability　while　the　motion　of　coarse　aggregates　in　SCC　is　simulated　with　DEM.　The　immersed　moving　boundary　method　is　incorporated　to　deal　with　the　interactions　between　coarse　aggregates　and　SCM.　After　validation,　the　coupled　framework　is　applied　to　study　SCC　flows　in　a　single　channel　and　in　porous　media　with　multi-channels.　A　passing　factor　PF　was　proposed　and　calculated　to　describe　quantitatively　the　passing　ability　of　SCC　through　a　single　channel.　The　study　found　that　jamming　of　SCC　occurs　when　the　ratio　Ar　of　the　gap　width　to　particle　diameter　is　smaller　than　2.0　and　the　jamming　risk　increases　with　solid　particles　fraction　while　the　passing　ability　has　a　weak　relation　with　the　pressure　gradient.　Further,　SCC　flow　is　self-tuning　in　porous　media　with　multi-channels　and　it　is　prone　to　go　through　larger　or　wider　gaps.　Exceeded　existence　of　narrow　gaps　will　significantly　increase　the　jamming　risk.