Mechanical binder mixing to 5.5 m depth — ground improvement without excavation.
In-situ Mass Stabilisation is a ground improvement in which a binding agent (typically lime, cement, or a combined binder) is mechanically mixed into weak soil to improve its strength, reduce its compressibility and reduce permeability. The process converts weak, wet or unstable soils into a more competent material that can support loads, be trafficked by construction plant, or form the foundation for embankments and structures.
In New Zealand, IMS is particularly applicable where low strength alluvial soils, or weak volcanic deposits are encountered during earthworks, embankment construction, road widening or infrastructure development. It is a sustainable technique that treats the material in place, eliminating the need for extensive excavation and disposal of unsuitable material, with significant programme and cost advantages where soft ground extends over large areas or to significant depths.
APPLICATIONS
GSI NZ CAPABILITY
THE GSI DIFFERENCE
Step 1
Soil sampling, classification, and laboratory testing define the soil properties. Laboratory mix design testing then determines the binder type and dosage required to achieve the target strength for the specific soil profile.
Step 2
The IMS tool is deployed across the treatment area in a systematic grid pattern. Binder is injected and blended mechanically to the design depth, forming a uniform stabilised mass without excavation or spoil removal. GSI's onsite grout batching plant reduces truck movements and fuel cost.
Step 3
UCS testing of field samples confirms the treated soil has achieved the design strength before any loading is applied. Full QA records are compiled into a completion report for client records and regulatory purposes.
CASE STUDY
GSI NZ was engaged by Marshall Projects to carry out in-situ mass stabilisation at the Motuoapa Wastewater Treatment Plant. Soft ground beneath the facility required improvement to provide adequate support for the treatment plant infrastructure.
IMS treatment avoided the excavation, spoil disposal, and engineered fill placement that would have been required under a conventional approach, delivering significant programme and cost savings while achieving the required bearing capacity for the facility foundation.
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In-situ mass stabilisation for soft ground improvement beneath a wastewater treatment plant.
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Ground improvement and foundation works for major Christchurch aquatic facility.
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126 soil-cement columns to stabilise an active landslide mass, Central Hawke's Bay.
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In-situ mass stabilisation treats large volumes of soft ground quickly and cost-effectively. Our team will assess your site and recommend the right approach.
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