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Project Profile N20GW027

Permeation Grouting Used to Strengthen Sand-Based Foundations at Coogee Beach Residence

Sub-industry
House
Problems
Subsidence
Location
NSW
Year
2018
Solutions
Ground Improvement
Technology
Permeation Grouting

The problem

The owners of a two-storey water views property in Coogee, Sydney, had undertaken renovations by adding a new upper level to their home. However, the building works had changed the magnitude of the loads to the footings and load path configuration.

The property’s strip footings, which were built on loose sandy soil, needed to be re-supported by strengthening the ground to increase its load bearing capacity.
Strengthening the immediate supporting ground under the footings enabled heavier loads to be applied and distributed across a larger area to avoid overloading loose sandy soil.
Coastal areas like Coogee are prone to ground instability due to sandy soil, often leading to significant structural problems during and after the building process. Mainmark worked directly with the homeowner to identify a solution that would satisfy the project’s structural engineer, recommending the use of permeation grouting, a long- established and widely used solution, to agglomerate and strengthen the sandy soil.
Prior to commencing the project, the structural engineer required the solution to be trialled on site to confirm it would deliver the level of ground strengthening required to achieve compliance.
Once the trial area had been approved by the structural engineer, Mainmark proceeded to use its permeation grouting solution for the remaining increased load areas around the home.

The solution

A ground strengthening solution to increase the bearing capacity of loose sandy soil was required. The site’s structural engineers also required reassurance that the solution would deliver the necessary load bearing capacity required for the new structure, reducing ground bearing stress at the interface between the treated and untreated founding soils.

The Result

Permeation grouting was identified by Mainmark as the most appropriate solution to strengthen and consolidate the site’s loose sandy soil.

Mainmark conducted an initial trial along an area approximately 3 Linear Metres, injecting the permeation grouting solution directly into an area beneath the home’s footings measuring 1m wide and 700mm deep.
The process of stabilising non-cohesive soils using permeation grouting involves the application of microfine cement or sodium silicate in liquid form into the ground via permeation spikes (or injection lances) at the depth to be treated, bonded and contained.
This technique fills micro voids in the sand to produce a solidified mass, bonding the sand particles with the permeation grout product. The solution is often used to stabilise and strengthen sandy soils prior to excavation and building works.

Resources

Project Resources & Downloads

Permeation Grouting Used to Strengthen Sand-Based Foundations at Coogee Beach Residence
Permeation Grouting
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