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Over 50 years experience
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1800 18 20 20
Faces ravel and collapse (‘running sand’) during excavation.
Water drives fines migration, piping/boiling and scour voids.
Local loss of bearing leads to slab deflection and differential settlement.
Broken stormwater/irrigation and dewatering drawdown can accelerate material mobilisation.
Faces ravel and collapse (‘running sand’) during excavation.
Water drives fines migration, piping/boiling and scour voids.
Local loss of bearing leads to slab deflection and differential settlement.
Broken stormwater/irrigation and dewatering drawdown can accelerate material mobilisation.
Assess whether the soil is genuinely groutable sand rather than silty or clay-heavy material. This stage defines groundwater conditions, fines content, permeability, density, and movement constraints to determine if permeation grouting is viable. The main goal is establishing the treatment envelope and acceptance criteria before any injection begins.
Test grout compatibility with the actual soil pore structure to ensure the grout can permeate without filtering, washing out, or setting too early. Grout type is selected based on particle size and performance requirements, typically using microfine cement for cleaner sands and colloidal silica or chemical grouts for finer or seepage-prone soils. Viscosity, gel time, bleed, and stability are critical QA factors.
Develop the injection layout, spacing, staging, and pressure controls through a controlled pilot area. This phase calibrates the relationship between pressure, flow, grout take, and ground response before full production begins. Monitoring systems are established to prevent hydrofracture, uplift, or uncontrolled grout migration.
Carry out the main grout injection process using controlled low-pressure permeation to fill the natural pore spaces without displacing the soil structure. The objective is to create a continuous strengthened and water-tightened ground mass while maintaining stable intake rates and preventing heave or fracturing. Continuous pressure, flow, and volume monitoring are essential during execution.
Perform secondary or tertiary injections to close untreated windows and improve curtain continuity. This stage strengthens local weak zones and further reduces seepage pathways, often using finer or lower-viscosity grouts to penetrate remaining pore spaces missed during the primary pass. Hydraulic continuity and seepage reduction become the main performance targets.
Validate the completed treatment using independent proof testing such as permeability testing, CPTs, coring, pressure testing, or load testing. The grouted ground is then integrated into excavation, dewatering, footing support, or construction sequencing. Any areas failing acceptance criteria are identified for remedial injection before construction proceeds.
Assess whether the soil is genuinely groutable sand rather than silty or clay-heavy material. This stage defines groundwater conditions, fines content, permeability, density, and movement constraints to determine if permeation grouting is viable. The main goal is establishing the treatment envelope and acceptance criteria before any injection begins.
Test grout compatibility with the actual soil pore structure to ensure the grout can permeate without filtering, washing out, or setting too early. Grout type is selected based on particle size and performance requirements, typically using microfine cement for cleaner sands and colloidal silica or chemical grouts for finer or seepage-prone soils. Viscosity, gel time, bleed, and stability are critical QA factors.
Develop the injection layout, spacing, staging, and pressure controls through a controlled pilot area. This phase calibrates the relationship between pressure, flow, grout take, and ground response before full production begins. Monitoring systems are established to prevent hydrofracture, uplift, or uncontrolled grout migration.
Carry out the main grout injection process using controlled low-pressure permeation to fill the natural pore spaces without displacing the soil structure. The objective is to create a continuous strengthened and water-tightened ground mass while maintaining stable intake rates and preventing heave or fracturing. Continuous pressure, flow, and volume monitoring are essential during execution.
Perform secondary or tertiary injections to close untreated windows and improve curtain continuity. This stage strengthens local weak zones and further reduces seepage pathways, often using finer or lower-viscosity grouts to penetrate remaining pore spaces missed during the primary pass. Hydraulic continuity and seepage reduction become the main performance targets.
Validate the completed treatment using independent proof testing such as permeability testing, CPTs, coring, pressure testing, or load testing. The grouted ground is then integrated into excavation, dewatering, footing support, or construction sequencing. Any areas failing acceptance criteria are identified for remedial injection before construction proceeds.
Very fine silts/clayey soils may not accept permeation grouts—alternative methods required. High groundwater velocities can cause grout washout; cut-off or staged dewatering may be needed.
Access constraints or sensitive adjacent structures may limit injection pressures/spacing. Global stability issues (e.g., active slope movement) must be addressed in parallel—not just local sand binding.
Small, shallow, isolated areas may be cheaper to excavate and replace; injection has fixed entry/mobilisation costs.
Larger treatment zones or works near valuable finishes/services favour grouting to avoid demolition and reinstatement.
Program risk: pre-treating sands to prevent collapse or inflows often avoids costly delays mid-construction.
Very fine silts/clayey soils may not accept permeation grouts—alternative methods required. High groundwater velocities can cause grout washout; cut-off or staged dewatering may be needed.
Access constraints or sensitive adjacent structures may limit injection pressures/spacing. Global stability issues (e.g., active slope movement) must be addressed in parallel—not just local sand binding.
Small, shallow, isolated areas may be cheaper to excavate and replace; injection has fixed entry/mobilisation costs.
Larger treatment zones or works near valuable finishes/services favour grouting to avoid demolition and reinstatement.
Program risk: pre-treating sands to prevent collapse or inflows often avoids costly delays mid-construction.
1800 18 20 20
admin@rectify.com.au
1800 18 20 20
admin@rectify.com.au
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