Cement-Based Rock Grouting: Shear Rate Dependencies-Video

Video Transcription

Video Summary

John Shamu presents research on how cement grout’s shear-rate behavior affects rock-grouting design. Rheometer tests show that wall slip can underestimate Bingham yield stress, while shear rates below a critical threshold cause time-dependent structural buildup and unstable flow. The study proposes comparing wall shear rates in the fracture with this critical rate, using a design nomogram to assess whether grout will continue flowing at the desired penetration distance. Accounting for wall slip and critical shear rate can substantially change predicted flow rates and grout propagation, improving estimates and potentially reducing injection time and material use.

Keywords

cement grout

shear-rate behavior

Bingham yield stress

wall slip

rock-grouting design