Permeation Grouting
Pictures
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Contact information
- Dominic Gibbon
- 01937 541118
- geotechnique@keller.co.uk
Process
Permeation grouting is the injection of a fluid grout into granular, fissured or fractured ground to produce a solidified mass to carry increased load and/or fill voids and fissures to control water flow.
Soil types
Sands, gravels and coarser open materials, fissured, jointed and fractured rock.
Advantages
- Controlled and accurate placement.
- Pre-determined size, shape, depth of treatment area.
- Flexibility to increase scope of treatment, both in time and location.
- Economical costs.
- Significant and predictable degrees of improvement.
- Non-vibratory.
- Limited work space required.
Grout types Cement-based:
- OPC/SRC.
- Cement/Bentonite.
- Cement/Sand.
- Cement/PFA/GSBFS.
- Microfine Cement.
- Chemical based:
- Sodium Silicates.
- Polyurethanes.
- Resins.
Method
Ranging from hand lancing and 'end-of-casing' methods, ascending and descending stage grouting to tube-a-manchette (TAM) methods wherein sleeved port TAM pipes are installed in a pre-determined pattern horizontally, inclined or vertically.
Permeation of the ground is by injection through discreet ports at specified designed intervals, rates and pressures to fully treat the target area. Re-injection via adjacent or previously injected ports is possible.
Product
Consolidated and strengthened soil and/or rock mass. Zone of reduced permeability for water control.
Quality Control
- Setting and gel time checks.
- Viscosity, density and bleed.
- Flow rate pressure vs. time.
- Volume per injection location.
- Pre and post treatment water permeability tests.
- Grout sample strength.
- Inspection pits and borehole samples.
- SPT, CPT and pressuremeter.
