Mishawaka, Indiana
ECO was retained by Jay Dee Contracting Ltd. to design a soil grouting program to stabilize cohesionless sandy soil above the trajectory of a new sewer line tunnel and below CP’s railway tracks. During tunneling activities (prior to grouting) significant ground loss was noted and settlement of the railway tracks occurred. All tunneling was stopped with the TBM stuck below the tracks.
In a one month period ECO:
- evaluated the site conditions,
- developed a remedial grouting plan,
- implemented and completed the pre-excavation grouting (ECO provided site supervision and hands-on direction to Jay Dee’s crews, who performed the grouting).
ECO developed a grouting program using 9 sleeve pipes (40 – 60 feet long). The grouting program was divided into 4 phases of work: permeation grouting south of the TBM, pre-excavation grouting north of the TBM, compensation grouting during tunneling and final strengthening of the soils (permeation grouting) after tunneling.
All MPSP sleeve pipes and several mechanical packers were built on site by Jay Dee Contracting with ECO’s supervision.
A total of 25 890 gallons of regular and microfine cement based suspension grouts were injected. Jay Dee continued tunneling below the railway tracks without any significant settlement occurring.