The　performance　of　a　tunnel-boring　machine　(TBM)　is　limited　by　an　intact　rock　mass　with　high　rock　strength,　A　high-pressure　water　jet　(　HPWJ　)　system　can　be　used　to　cut　kerfs　on　the　tunneling　face　to　promote　the　cutting　efficiency　of　the　cutter.　However,　only　a　few　pertinent　large-scale　tests　have　been　conducted,　which　were　not　systematic.　To　study　the　effect　of　the　layouts　of　the　TBM　cutter　and　high-pressure　water　jetting　(HPWJ)　on　the　cutting　efficiency.　linear　cutting　tests　using　the　HPWJ　and　full-scale　cutter　were　successively　performed　on　biotite　granite　specimens　from　Longyan.　Fujian.　Four　cutting　layouts　were　designed　including　cutter　cuts　along　the　midline　of　two　kerfs,　on　a　single　kerf,　along　the　middle　of　three　kerfs,　and　on　the　sides　of　a　single　kerf.　Cutting　without　the　assisted　HPWJ　kerf　was　also　performed　for　comparison.　The　cutter　forces　were　obtained　during　the　tests,　and　rock　mucks　were　collected　and　sieved.　Finally,　the　patterns　of　crack　propagation　under　different　cutting　layouts　were　analyzed　based　on　the　observations.　The　following　findings　were　drawn:　The　overlapping　cutting　trajectories　of　the　HPWJ　and　cutter　prove　beneficial　for　cutter　penetration,　resulting　in　reduced　cutter　forces.　In　addition,　this　facilitates　the　oblique　expansion　of　the　lateral　cracks　to　the　upward　free　surface;　however,　the　size　of　the　rock　chips　is　small;　When　the　cutter　cuts　along　the　middle　one　of　the　three　kerfs,　the　expansion　of　lateral　cracks　on　one　side　of　the　cutter　may　be　suppressed;　The　best　cutting　performance　is　achieved　by　rotating　the　cutter　between　the　two　kerfs　cut　by　HPWJ.　This　facilitates　the　propagation　of　lateral　cracks　on　both　sides　of　the　cutter　toward　the　bottom　of　the　kerfs,　forming　large　rock　chips.　The　cutting　efficiency　of　the　cutter　increases　with　the　deeper　kerfs.　This　study　can　serve　as　a　reference　for　the　design　of　a　TBM　cutterhead　utilizing　both　cutters　and　HPWJ　s,　as　well　as　for　estimating　its　performance.　©　2024　Chang＇an　University.　All　rights　reserved.