The York Durham Sewage System (YDSS) Interceptor Sewer construction spanned a total length of 5.5 km, which included a 1.4-km stretch of open cut construction and tunnelled stretch of 4.1 km, with four access shafts. Two of the tunnel access shafts were located in an environmentally sensitive area with water bearing cohesionless soils and considered as a potential geotechnical hazard for tunnel break-ins/break- outs. A combination of slurry wall and jet grouting was used to stabilize the ground and control groundwater flow at shafts #2 and #3 during break-in/break-out of the tunnel boring machine (TBM). This paper presents a case study, addressing the application of double fluid jet grouting technique to mitigate a significant geotechnical hazard at shafts #2 and #3 for the YDSS Interceptor Sewer Project.
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