ℹ Established March 2011 • Queensland, Australia

Authoritative Geotechnical Advisory & Ground Testing Standards

GAT (QLD) Pty Ltd delivers rigorous geotechnical monographs, residential site classification benchmarks (AS 2870), and subgrade engineering guidance for civil practitioners, builders, and developers across Queensland.

AS 2870 Site Estimator Explore Monographs

15+ Years Operating

620+ Technical Reports

100% AS/NZS Standards

Geotechnical Framework Overview

Key Australian Standards & Investigation Parameters

Primary Standard: AS 2870-2011 (Residential Slabs and Footings)

Investigation Standard: AS 1726 (Geotechnical Site Investigations)

Piling Standard: AS 2159 (Piling - Design and Installation)

Corporate Registry: ASIC Registered ACN 149 686 751

View Specification Protocols

Core Advisory Disciplines

Independent Ground Engineering Guidance

Comprehensive geotechnical assessment frameworks built on decades of empirical soil mechanics and Queensland coastal geological data.

AS 2870 Site Classification

Methodologies for determining characteristic surface movement (ys) across reactive clay strata, silt benches, and coastal sand deposits.

Read Classification Guide →

Subgrade & CBR Testing

Evaluation protocols for California Bearing Ratio (CBR), dynamic cone penetrometer (DCP) testing, and subgrade stabilization techniques.

Review Testing Protocols →

Slope Stability & Landslip Risk

Geotechnical slope hazard assessments, groundwater pore-pressure monitoring, and retaining wall foundation engineering.

Explore Slope Studies →

Interactive Engineering Utility

AS 2870 Residential Site Classification Estimator

Select soil profile, climatic reactivity zone, and terrain grade to view projected site classification, characteristic surface movement, and foundation guidelines.

Dominant Soil Profile (AS 1726 Description)

Queensland Climatic Zone (Reactivity Depth Hs)

Site Gradient & Slope Geometry

ℹ Note: This tool provides preliminary reference estimations according to AS 2870 principles. Formal engineering certification requires on-site borehole sampling and NATA-accredited laboratory testing.

Class M

Estimated Classification

Description: Moderately reactive clay / silt site. Standard residential foundation designs apply.

Characteristic Surface Movement (y_s): 20 - 40 mm

Recommended Foundation Strategy: Stiffened raft slab or reinforced continuous strip footings (AS 2870 compliant).

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Standardization Matrix

Australian Geotechnical Assessment Frameworks

Summary of mandatory standards governing our published engineering monographs and advisory documentation.

Standard Code	Title & Scope	Primary Evaluation Criteria	Advisory Applicability
AS 1726:2017	Geotechnical Site Investigations	Borehole sampling, SPT penetration, DCP, logging standards	Pre-construction site characterization
AS 2870:2011	Residential Slabs & Footings	Reactivity index, surface movement (ys), footing stiffness	Class A through Class P foundations
AS 2159:2009	Piling — Design & Installation	End-bearing capacity, skin friction, pile load testing	Deep foundation and soft soil stabilization
AS 3798:2007	Guidelines on Earthworks for Commercial & Residential	Compaction control, nuclear density testing, Level 1 supervision	Engineered structural fill validation
AS 4678:2002	Earth-Retaining Structures	Active/passive earth pressures, surcharge, global stability	Gravity, cantilever, and reinforced soil walls

Compliance & Inquiries

Frequently Asked Questions

Key information regarding geotechnical site investigations and GAT (QLD) Pty Ltd advisory resources.

Class M sites exhibit moderate reactivity with predicted characteristic surface movement between 20mm and 40mm. Class H1 sites are highly reactive with predicted movement between 40mm and 60mm due to higher clay content and moisture susceptibility. Class H1 requires deeper stiffening beams and higher reinforcement ratios to prevent structural cracking.

A Class P classification indicates abnormal moisture conditions, uncontrolled or non-certified fill greater than allowable limits, soft compressible alluvial soils, significant slope instability risk, or presence of existing tree roots and demolition debris that compromise uniform bearing capacity.

Since our incorporation in 2011, GAT (QLD) Pty Ltd has maintained independent technical publications, comparative soil analysis databases, and reference monographs accessible to industry practitioners, civil engineers, and registered certifiers.

Standard inquiries should include the project location, approximate lot dimensions, preliminary architectural concepts, and any historical soil bore logs if available. You may submit your inquiry directly via our contact portal.

Advisory Registry

Submit a Technical Inquiry

Reach out to our engineering advisory team for monograph access, technical clarifications, or assessment scopes.