During slurry TBM tunnelling, the working face stability is achieved by pressurized slurry in excavation chamber to balance soil and water pressure on the working face, and excavated muck is transported by slurry circulation system. Slurry TBM is characterized by stabilizing working face in quicksand prone stratum, operating in normal atmosphere pressure, with little disturbance to surrounding ground and with precise settlement control.
Wuhan Metro Project, China (clay, silty clay mixed with powder sand)
The TBM drive between Qintai Station and Wusheng Station (i.e. Lot 10 Phase 1 of Wuhan Metro Line 6) crosses Yangtze River with total length of 1732m where maximum water pressure is 4.5kg and minimum turning radius 350m. Main strata thereof are featured by clay, silty clay with powder sand, clay with gravel, weathered silt stone and moderately weathered limestone, etc. CREC TBM supplied for this project set an impressive record of daily advance of 28.5m.
Thomson Line T209 Project, Singapore
Thomson MRT Line extends 30 km in length, CREG designed and manufactured slurry TBMs for boring the TBM drive from Lentor Station to Mayflower Station. Major challenge faced is complex geology represented by full-face soft ground, mix ground, full-face rock, etc. CREG supplied tailor-designed TBMs with optimized cutterhead layout, high-power drive and faster cutter-head revolution as solution for the project.