AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

What does jet grouting do when used for tunnel or shaft ground control?

It only paints the ground surface to mark the alignment It replaces the TBM cutterhead with a grout pump It is used only to color-code One-Call marks It erodes soil with a high-pressure grout jet and mixes the soil with grout to form treated columns or a block that can reduce permeability and improve strength

Correct Answer:

It erodes soil with a high-pressure grout jet and mixes the soil with grout to form treated columns or a block that can reduce permeability and improve strength

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