To　investigate　the　possibility　of　quantitative　monitoring　of　the　fracture　process　zone　(FPZ)　at　the　shotcrete-rock　interface,　the　acoustic　emission　(AE)　and　digital　image　correlation　(DIC)　are　used　to　monitor　the　three-point　bending　test　of　shotcrete-rock　specimens.　Firstly,　the　AE　intensity　signal　characteristics　during　damage　to　the　shotcrete-rock　interface　are　analyzed.　Then,　the　spatial　b-value　of　AE　is　used　to　visually　characterize　the　shotcrete-rock　interface　damage,　and　the　interface　damage　characteristics　of　two　specimens,　shotcrete-granite　and　shotcrete-sandstone,　are　analyzed　using　this　analysis　method.　The　analysis　reveals　that　not　only　the　AE　spatial　b-value　can　determine　the　location　of　microdamage　within　the　interface　but　it　can　also　characterize　the　degree　of　damage.　Finally,　a　new　parameter,　Tb-value,　is　constructed　based　on　the　AE　spatial　b-value　to　quantitatively　characterize　the　FPZ,　and　the　newly　established　characterization　method　is　validated　with　the　FPZ　monitored　by　DIC.　The　results　show　that　the　Tb-value　not　only　locates　and　visually　characterizes　the　location　of　the　FPZ　within　the　specimen　but　also　enables　the　quantitative　determination　of　the　FPZ.　This　provides　a　new　idea　for　localizing　and　quantitatively　monitoring　cracks　and　FPZs　inside　structures　using　AE　techniques.　　©　2023　Yuzhu　Guo　et　al.