Muskrat Falls North Dam Grout Curtain with Gin Principle-Video

Video Transcription

Video Summary

The presentation reviewed the 2018 JIN grouting program at the Musgrave Falls hydroelectric project, designed to reduce seepage beneath the dam to one Lugeon or less. Although the bedrock was generally strong, low-permeability granite, joints and faults created localized water-flow paths.<br /><br />The grout intensity number (JIN) method used one stable grout mix and adjusted pressure and flow together to suit the rock, helping prevent hydraulic fracturing. Field trials calibrated equipment, tested the rock and grout, and refined the JIN parameters and refusal criteria. Production grouting was carried out in stages from a confined gallery, with drilling, grout properties, pressure and flow monitored and quality-checked.<br /><br />Higher grout takes were generally found deeper in the rock. Additional holes treated these areas, and verification drilling and water tests showed permeability below one Lugeon. The presenter concluded that the grouting program successfully sealed the targeted fissures.

Keywords

JIN grouting

Musgrave Falls

hydroelectric project

seepage reduction

grout permeability