The　initial　stress　of　the　surrounding　rock　mass　will　be　redistributed　during　TBM　tunneling　in　a　deep　tunnel.　This　process　may　induce　brittle　failure　of　the　surrounding　rock　mass,　which　has　a　great　impact　on　TBM　construction.　The　southern　section　of　the　Yinhan　Water　Conveyance　Tunnel　is　mainly　composed　of　massive　to　intact　granite,　with　a　maximum　overburden　depth　of　nearly　2000　m.　The　paper　discussed　in　detail　the　relationship　between　various　brittle　failure　degrees　at　the　typical　tunnel　faces　and　TBM　performance.　The　typical　patterns,　such　as　undamaged,　slabbing,　and　strain　rockburst　at　the　tunnel　face,　and　the　corresponding　characteristics　of　the　TBM　performance　parameters　were　revealed.　As　the　severity　of　damage　increases,　the　rock　mass　boreability　is　improved,　the　cutterhead　thrust　is　reduced,　and　the　penetration　increases,　but　there　is　an　upper　limit.　It　is　noteworthy　that　the　field　penetration　index　(FPI)　fluctuation　expressed　by　the　coefficient　of　variation　(CV)　varies　significantly　in　different　stress　states.　Based　on　the　excavation　response　of　TBM,　a　Rockburst　Warning　Index　(RWI)　was　proposed　to　assess　the　brittle　failure　degree　of　the　excavated　rock　mass　in　real-time.　The　results　of　the　study　can　provide　some　insights　into　the　prediction　of　TBM　performance　and　the　early　warning　of　rockburst　in　deep-buried　hard　rock　grounds.