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Ground Improvement

Teretek® Resin Injection

Overview

Innovation in Ground Improvement

Teretek® resin injection is used for ground improvement beneath existing structures. There are two primary applications for the technology, bearing capacity increase and liquefaction mitigation.

Teretek® for ground improvement has been researched and developed to an extent that it can be designed to a high level of accuracy. Throughout its development, Mainmark have worked with international experts on the to test its performance across a wide range of geotechnical conditions.

Mainmark works with client engineers to align the design requirements with achievable improvement targets. The design is determined by the initial soil properties and the desired target outcome for the overall performance of the structure. This influences the injection depths and extent of improvement required. Following the site application, the design is then validated using standard geophysical tests.

Improvement Mechanism

Teretek® resin injection strengthens the ground primarily through the densification of soil using an expanding polyurethane resin.

As the resin expands, it densifies the surrounding soil and increases its strength and stiffness characteristics. In addition, several secondary benefits occur, including an increase in composite stiffness and particle cementation.

The process involves the installation of small injection tubes, spaced evenly within the target improvement zone. At each point, resin is injected into the ground, forming a resin-soil matrix.

Testing and Validation

Teretek® resin injection projects are often within or in close proximity to existing structures and ongoing building operations. Following an engineering design, ground improvement targets are set, which are then validated through pre- and post-geotechnical tests.

The Cone Penetrometer Test (CPT) is predominantly utilised in this context due to its precision in determining essential soil parameters like tip resistance, soil strength, and liquefaction potential. When operating beneath existing structures or in confined spaces, miniaturised CPT rigs become invaluable, navigating restrictive sites and basements.

When required, the Direct-Push Cross-Hole (DPCH) test offers a broader perspective on larger projects, particularly for determining soil’s shear wave velocity.

On simpler projects, the Dynamic Cone Penetrometer (DCP) can be utilised to assess bearing capacity.

Resources

Ground Improvement

Resin Injection Ground Improvement Research Trials – Avondale and Bexley Red Zone Christchurch
Use of expanding polyurethane resin to remediate expansive soil foundations
Structure and properties of expanding polyurethane foam in the context of foundation remediation in expansive soil
Resin injection as a ground improvement method

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© 2024 The Mainmark group of companies. ‘Mainmark®’, ‘Terefil®’, ‘Terefirm®’ and ‘Teretek®’ are trademarks of the Mainmark group of companies.

Mainmark Ground Engineering Pty Ltd
ABN: 51 606 182 503

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