• Geotechnical Report

    Geotechnical Report

Geotechnical Report

A geotechnical site investigation is the process of collecting information and evaluating the conditions of the site for the purpose of designing and constructing the foundation for a structure, such as a building.

Good planning for and management of a geotechnical site investigation is the key to obtaining sufficient and correct site information for designing a structure in a timely manner and with minimum cost for the effort needed.

Geotechnical report uses the principle of soil mechanics and rock mechanics to investigate subsurface conditions and materials; determine the relevant physical, mechanical and chemical properties of these materials; evaluate stability of natural slopes and manmade soil deposits; assess risks posed by site conditions; design earthworks and structure foundation. A geotechnical engineer determines and designs the type of foundations and earthworks required for the intended man-made structures of various sizes buildings, bridges, and other structure on soil.

The geotechnical report depends on following criteria

  • Design criteria of the proposed structure;
  • Historic knowledge of general site conditions and building performance
  • Drilling equipment availability
  • Time of year the work needs to be done may determine the geotechnical site investigation
    method and finally
  • The overall costs


Importance of Geotechnical report


Geotechnical report plays important role in roadways and structural design. Geotechnical experts use preliminary plans to develop an investigation plan. Going by established geotechnical guidelines, the experts will decide where to dig soil samples, at what intervals and how many samples, this helps for better work. Safely and longevity of the road or structure are the overriding goals of geotechnical reports, and those factors depend very much on knowing how the land, soil, rocks will behave.


Geotechnical report services


  • site class of the proposed development
  • site class to assess existing structure
  • the geology of the area
  • the optimum design recommendation
  • investigate design failure of any structure
  • know the possible impact of local geology to your property


Foundation of Geotechnical report


  • Shallow Foundations: Shallow foundations are a type of foundation that transfers building load to the very near the surface, rather than to a subsurface layer.
  • Footings: Footings are structural elements which transfer structure loads to the ground by direct areal contact. Footings can be isolated footings for point or columns loads, or strip footings for wall or other long loads. Footings are specially constructed from reinforced concrete directly onto soil and are typically embedded into ground.
  • Slab Foundations:A variant on spread footings is to have the entire structure bear on a single slab of concrete underlying the entire area of the structure. Slabs must be thick enough to provide sufficient rigidity to spread the bearing loads somewhat uniformly, and to minimize differential settlement across the foundation.
  • Deep Foundations: Deep foundations are used for structure or heavy loads when shallow foundations cannot provide adequate capacity, due to size and structural limitations. They may also be used to transfer building loads past weak or compressible soil layers. Deep foundations can rely on end bearing resistance along their length, or both in developing the required capacity.
Bushfire Attack Limit Assessment

A BAL (Bushfire Attack Level) is a means of measuring a building’s potential exposure to ember attack, radiant heat and direct flame contact, in a bushfire events. It is a basis for establishing the requirements for construction to improve protection of building elements from attack by bushfire.

The BAL takes into consideration a number of factors including the Fire Danger Index, the slope of land, types of surrounding vegetation and its proximity to any building.

The aim of the Australian Standard is to improve the ability of a building to withstand a bushfire attack. This will provide greater protection for the occupants who may be sheltering in it while the fire front passes. It also increases the chances of the building surviving.


  • To know BAL rating of your area
  • To assure the proposed design has adequate fire safety
Wind Classification

The design of any structures, as a whole or part, may influence by the wind rating. There are several factors which can be contributing to wind ratings. Factors that influence the wind classification are the region in which the building is to be located, the nature of surrounding terrain and degree to which the building is shielded by other natural and man-made objects and structures.

Once these three factors are determined then the wind classification, or N rating, can be established. As such wind classification is very crucial to accomplish cost effective project without compromising structural adequacy of any component. We have expertise in assessing the site specific wind classification to meet your requirements

Wind classification services

  • Water retention system in your property
  • To know exact soil reactivity for a design
  • Wind rating assessment
  • Wind pressure calculation for any structural member
  • To analyse existing structure if that withstand current wind pressure
Soil Shrink Swell Test

Expansiveness (also referred to as reactivity) is a phenomenon that affects many clay soils, particularly those that contain significant quantities of clay minerals.

In many cases, the shrinking and swelling of expansive clays in response to moisture content change can be a serious cause of damage to buildings.

The shrink swell test is a simple test that is routinely employed in Australian geotechnical engineering practice to assess quantitatively the expansive potential of undisturbed or remolded clay soils, and to guide design of footings on these soils.

Soil shrink swell test services

  • Water retention system in your property
  • To know exact soil reactivity for a design
  • To analyse failure mode of any structure due to reactivity
  • To cost effective foundation design
Site Classification

Before any construction starts on a site (even before house plans are decided on), the soil on the site needs to be tested by a geotechnical engineer.

Soils are classified according to their stability. Soil samples are taken from the site to determine soil class. A Site Classification report will clearly state the likely soil conditions, soil profile, geology and recommend a suitable footing system in accordance with AS 2870.

Site classification types

  • Water retention system in your property
  • To know site class of the proposed development
  • To know site class to assess existing structure
  • To know the geology of the area
  • To know the design parameters

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  • Fusion Engineering Service
  • Phone : 1800 787 750
  • www.fusionengineering.com.au
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