Oriented Jet Grouting 'M' Supports For Underpinning Historical Foundations-Video

Video Transcription

Video Summary

The presentation introduces an M-shaped jet-grouting method for underpinning historic structures when conventional excavation, dewatering, or drilling through fragile foundations is unsuitable. Alternating vertical and battered grout columns encapsulate and confine soil beneath wide foundations, providing support while reducing grout volume and construction impacts. Finite element analysis found the M configuration produced bearing capacity and settlement performance comparable to full underpinning, with only small, manageable stress increases at grout interfaces. Successful implementation requires careful column spacing and sequencing, test grouting, verification of geometry and strength, and real-time structural monitoring and data review.

Keywords

M-shaped jet grouting

underpinning historic structures

grout columns

bearing capacity

structural monitoring