The best engineering
solutions with guaranteed
value for money
Reputable geotechnical engineering solutions in ACT
We provide the best engineering solutions. We guarantee value for money results for our clients. Our full range of geotechnical engineering services benefit residential, commercial and industrial developments of all sizes.
Our range of services:
We provide clients with a range of comprehensive services, including:
- Geotechnical site investigations
- Geotechnical engineering report
- Engineering geology
- Mining geotechnics
- Foundation engineering
- Dam engineering, embankment design & specification
- Instrumentation and monitoring
- Slope instability and risk assessments
- Site classifications (soil tests) to AS2870
- Residential slabs and footings’ for new houses and extensions
- Footing certifications
- Supervision and certification of earthworks and controlled fill, including Level 1 supervision
- Excavated soil/rock assessments and VENM assessments
- Pavement engineering and design
- Establishing and assessing NATA mechanical testing laboratories.
- Point load (UCS testing)
- Effluent disposal (wastewater) assessments to AS1547
- Soil electrical resistivity testing
- Ground vibration monitoring
Australia-wide geotechnical service
Our geotechnical engineering head office is in Canberra and naturally we service the ACT and surrounding region, however we consult on projects Australia-wide.
Our team has previously provided services for projects in New South Wales, Queensland, the Northern Territory and Victoria.
Site Classification Reports
Site Classification reports are used by structural engineers to accurately determine the most appropriate footing and slab design for a proposed residential development, in order to withstand the expected ground movement on a particular site. Site classification reports are also typically required to be submitted to council as part of the development approvals process.
For Site Classifications ACT Geotechnical Engineers investigate subsurface conditions of the site by using one or two boreholes drilled to approximately 1.5m depth as well as a dynamic cone penetrometer (DCP) test if required. Subsurface conditions are visually logged by an experienced geotechnical engineer, and the hole immediately backfilled upon completion. The holes would be drilled at/near the location of the proposed residence and art studio depending on access and location of underground services (Telstra, power, gas, water, sewer, etc.). More often than not, the fieldwork can be done within about a week of approval, allowing for underground services clearances, and our report would be issued soon thereafter.
Following sitework, ACT Geotech provides a PDF copy of the report, which would include:
- Engineering logs of the boreholes & plan showing borehole & DCP locations
- Description of the site geology/subsurface conditions including existing fill, bedrock and groundwater
- Site classification to AS2870 and potential soil reactivity
- Recommend building footing types, founding strata and allowable bearing pressures
- Any other relevant geotechnical information, including excavation conditions (if a site cut is required), suitability of excavated material for use in controlled fill platforms and advise for construction of building platforms, stability of cut batters etc.
- Advise on site drainage
ACT Geotech conducts site classifications within the ACT and surrounding region. Please call or send us an enquiry through the contact page or ‘book an inspection’.
Geotechnical Site Investigations
Geotechnical investigations involve drilling and visually logging boreholes in accordance with the Unified Soil Classification System (USCS). Investigations may also involve soil sampling for Californian bearing ratio (CBR) and acid suphate soils as well as dynamic cone penetrometer tests (DCP).
The outcome of our Geotechnical Investigations is a model of the subsurface profile of the site. This information allows us to:
- Verify depths and strengths of bedrock (if any) for basement construction and design Recommend building footing types, founding strata and allowable bearing pressures
- Provide advice on preparation of subgrades for building slabs, vehicle pavements and carpark
- Advise on excavation conditions, suitability of excavated material for use in controlled fill platforms and advise for construction of building platforms
- Confirm stability of cut, batters, and shoring/support of temporary basement excavations
- Provide design parameters for temporary excavation support
- Confirm earth/rock pressure parameter values for retaining wall design
- Advise on Indicative subgrade design CBR for carpark subgrades
- Provide earthquake design parameters to AS1170.4 – 2007, as well as;
- Advise on site drainage
Slope Stability and Risk Assessments
Slope stability assessments are usually conducted in landslip prone areas and areas where the gradient of the site is greater than 18°. Many councils in NSW require residential and commercial properties to have a slope stability and risk assessment conducted by an experienced geotechnical engineer for Development Approval (DA).
Slope stability and Risk assessments involve a preliminary desktop and historical data study prior to attending the site. When on site, one of our experienced geotechnical engineers will ascertain a subsurface profile of the site by drilling and visually logging boreholes in accordance with the Unified Soil Classification System (USCS). Dynamic cone penetrometer tests (DCP) are also conducted when necessary. The site data is then used to carry out a risk assessment using the Australian Geomechanics Society (AGS) Guidelines.
Supervision and Certification of Earthworks and Controlled Fill Inc. Level 1 supervision:
Level One Supervision has become a standard requirement for many building developments sites. With ACT Geotechnical Engineers, Level One supervision ensures an earthworks site has been filled and compacted to a high standard under controlled conditions. An ACT Geotechnical engineer will oversee and supervise the earthworks including:
- The removal of all non-certified fill, topsoil and deleterious material
- The placement and compaction of fill
- Proof rolling the foundations to check for any weak or wet areas that would require replacement.
- Confirmation of the suitability of the foundation.
- Trenching and backfilling
- Proof rolling and testing
On completion of the supervised earthworks, the geotechnical engineer will provide a report containing the test results and test locations, the details of the inspections and a controlled fill certification.
ACT Geotechnical Engineers has extensive geological knowledge of the Canberra and New South Wales area. The geotechnical engineers at ACT Geotechnical Engineers are supported in fieldwork and technical work by senior engineering geologist Dennis Dyer. Dennis provides specialised geological expertise for both small and major project needs. Dennis has 50 year’s experience in engineering geology, including work on the dams and tunnels of the Snowy Mountains Scheme, and tertiary lecturing.
As a small consultancy, we do not require external QA accreditation however we are fully conversant with all current QA guidelines. Likewise, when working with clients, we fully comply with the obligations of their individual QA systems.
To monitor all processes and maintain our high standards of delivery, we ensure:
- Investigations are conducted in accordance with Australian standards.
- All work is cross-checked, with reports reviewed prior to issue to clients.
- Records are kept in a central filing system for easy reference.
- Streamlined procedures for processing all commissions, from proposal through to issue of reports.
All accreditations held by ACT Geotechnical Engineers are available on request.