The　modified　rock　mass　classification　system　for　TBM　tunnels　and　tunneling　was　proposed　to　assess　rock　mass　quality,　rock　mass　boreability,　and　TBM　construction　suitability.　However,　the　section　concerning　the　impact　of　adverse　geological　conditions　on　TBM　utilization　was　not　yet　finalized.　In　this　study,　the　classification　system　was　upgraded　to　the　stressed　hard　rock　tunnels　by　adding　the　coefficient.　A　database　comprising　551　instances　of　rockbursts　and　their　corresponding　TBM　performance　data　was　compiled　from　the　Yinhan　Water　Conveyance　Tunnel　in　China.　The　characteristics　of　rockbursts　occurring　in　the　tunnel　excavated　by　TBM　and　their　formation　mechanisms　were　introduced.　The　depth　of　damage　to　the　tunnel　wall　was　used　as　the　assessment　index　for　the　intensity　grade　of　rockbursts.　Quantitative　relationships　were　established　between　the　intensity　grade　of　rockbursts　and　TBM　performance　parameters　for　the　first　time.　As　the　intensity　grade　of　rockbursts　increased,　there　was　a　substantial　reduction　in　TBM　utilization,　while　the　penetration　rate　exhibited　no　significant　changes.　The　reduction　coefficient　βA　for　TBM　utilization　at　the　rockburst　intensity　grades,　namely　minor　damage,　moderate　damage,　and　severe　damage,　was　determined　to　be　0.88,　0.60,　and　0.39　respectively.　These　coefficients　were　subsequently　integrated　into　the　classification　system.　Finally,　a　simple　case　was　presented　to　illustrate　the　applicability　of　the　rockburst　reduction　coefficient　βA　and　the　upgraded　system.　©　2024　Elsevier　Ltd