Engineers deployed a pioneering ground strengthening and water ingress reduction technique that could be injected within close proximity to buried utilities without the need for major excavation due to the high water table.
The solution involved:
Water Ingress Reduction Grout Curtain:
The engineered solution utilised Geobear's specialist geopolymer resin, injected through a series of small-diameter (12mm) injection tubes, drilled down to the clay level and injected at pre-determined intervals from clay level back up to 1.5m below ground level.
Injections were set out on a pre-determined staggered grid pattern with 3 rows of injection to create the curtain around each excavation area. The geopolymer treatment design for the eastern and western sections of the work are shown in Figures 2 and 3 respectively.
Figure 2
Figure 3
A schematic cross section of the design is shown in Figure 4.
Figure 4
Upon injection, the expanding resin permeated the surrounding ground, filling voids, fissures, and permeable pathways within the soil matrix to form a continuous low-permeability curtain. Figure 5 shows the excavation works in progress.
Figure 5: Trench excavation works
Get in touch with our expert team today and discover how Geobear can extend the life of your critical infrastructure assets.
