Wet Mass Soil Stabilization for Excavation Support-Video

Video Transcription

Video Summary

At Minneapolis–Saint Paul International Airport, shallow bedrock and variable, cohesionless soils made conventional grouting for a retaining-wall project challenging. The team proposed shallow mechanical mixing as an alternative, creating a cemented soil block for temporary excavation support. Design checks addressed sliding, overturning, shear, and bending, with a target strength of 200 psi. Using five-foot mixing tools, ready-mixed grout, and real-time monitoring, the work produced relatively consistent soilcrete. Strength tests exceeded the design minimum, so excavation was accelerated to limit further strength gain. The approved alternative proved cost-effective and helped the project schedule, while providing safe, stable support for wall construction.

Keywords

retaining wall

soil mixing

soilcrete

excavation support

Minneapolis–Saint Paul International Airport