Compensation or fracture grouting is the injection of a cement slurry grout into the soil creating and filling fractures that then lift the overlying soil and structures.
Process
A sleeve port pipe is grouted into a pre-drilled hole beneath a structure and grout injected under pressure at strategic locations through the ports.
Once the hydrofracture pressure of the soil is exceeded, fractures open in the soil and are immediately expanded by the influx of grout. This results in the controlled heave of the overlying soils and structures.
Common uses
- Re-level structures
- Stabilise and mitigate the settlement of overlying structures during tunnelling
Advantages
- Unobtrusive, as it can be done from shafts or tunnels without access to affected buildings
- Precise control and reporting when linked to an effective monitoring system
Quality assurance
Keller can provide complete solutions which combine fracture grouting with real-time monitoring of affected structures.
Extensive experience has allowed us to develop advanced drilling and computerised grouting systems that integrate the grouting injection process and real time monitoring. Grout injection data is plotted against time and summarised in three dimensional plots and reports.
Related resources
Related projects
Energy and utilities
Lifting of Settled Crude Oil Tank
Ground improvement and remediation works for a crude oil tank at a tank farm on an island.
