Product Overview

Summary: This Geotechnical Analysis Safe Operating Procedure sets out a consistent, defensible method for investigating, testing and interpreting ground conditions on Australian worksites. It helps organisations manage geotechnical risk, protect workers and the public, and demonstrate compliance with WHS obligations and engineering due diligence across construction, mining and civil infrastructure projects.

Geotechnical analysis underpins the safety and stability of every structure, excavation and earthworks activity on site. Inadequate or inconsistent geotechnical processes can lead to slope failures, trench collapses, subsidence, structural damage and serious injury or fatality. This Geotechnical Analysis Safe Operating Procedure provides a clear, step‑by‑step framework for planning and conducting site investigations, sampling, laboratory testing, data interpretation and reporting, with a strong focus on WHS risk management and regulatory expectations in the Australian context.

The SOP guides your team from initial desktop review and hazard identification through to the development of geotechnical models, design parameters and risk controls that are practical for construction and ongoing operations. It clarifies roles and responsibilities between designers, geotechnical specialists, contractors and site supervisors, ensuring that critical information about ground conditions is communicated and acted upon before people and plant are exposed to risk. By standardising your approach, this document helps you avoid costly rework, project delays, disputes and safety incidents arising from unforeseen ground behaviour.

Designed for use across construction, mining, local government and infrastructure projects, this SOP supports compliance with Australian WHS legislation, relevant Australian Standards and industry codes of practice. It is an essential tool for organisations wanting to demonstrate due diligence in geotechnical decision‑making, improve the quality and consistency of their analyses, and embed geotechnical risk management into everyday project planning and site control.

Key Benefits

• Ensure a consistent, defensible methodology for geotechnical investigations and analysis across all projects.
• Reduce the risk of ground failures, trench collapses and instability incidents that can harm workers or the public.
• Demonstrate due diligence and compliance with Australian WHS legislation, engineering standards and client requirements.
• Streamline communication of geotechnical risks and design assumptions between engineers, contractors and site supervisors.
• Minimise costly rework, delays and disputes caused by unforeseen ground conditions or inadequate site characterisation.

Who is this for?

• Geotechnical Engineers
• Civil Engineers
• Site Supervisors
• Construction Project Managers
• Mining Engineers
• WHS Managers
• Infrastructure Asset Managers
• Engineering Consultants
• Local Government Engineers
• Principal Contractors

Hazards Addressed

• Excavation and trench collapse due to underestimated soil strength or groundwater conditions
• Slope instability and landslides affecting workers, plant, public areas or adjacent properties
• Ground subsidence and settlement impacting structures, services and access routes
• Uncontrolled groundwater inflow leading to flooding, erosion or loss of ground support
• Failure of temporary works such as shoring, retaining systems and batter slopes
• Unexpected rock falls or block failures in cuttings, pits and underground openings
• Exposure to contaminated soils or hazardous ground gases during investigation works
• Struck-by incidents from drilling rigs, sampling equipment or falling materials during site investigations

Included Sections

• 1.0 Purpose, Scope and Application
• 2.0 Definitions and Key Geotechnical Concepts
• 3.0 Roles, Responsibilities and Competency Requirements
• 4.0 Regulatory and Standards Framework (Australian Context)
• 5.0 Project Initiation and Desktop Study Requirements
• 6.0 Geotechnical Hazard Identification and Risk Assessment
• 7.0 Planning Geotechnical Investigations (Field and Laboratory)
• 8.0 Site Access, WHS Controls and Permit Requirements for Investigation Works
• 9.0 Field Investigation Procedures (Drilling, Test Pits, In-situ Testing, Sampling)
• 10.0 Laboratory Testing Selection, Handling and Chain of Custody
• 11.0 Data Management, Validation and Quality Assurance
• 12.0 Geotechnical Analysis and Development of Design Parameters
• 13.0 Assessment of Excavation Stability, Slopes, Retaining Systems and Foundations
• 14.0 Groundwater Assessment and Control Considerations
• 15.0 Geotechnical Risk Classification and Mitigation Measures
• 16.0 Reporting Requirements and Communication of Geotechnical Risks
• 17.0 Integration with Design, Construction Planning and Safe Work Method Statements
• 18.0 Monitoring, Verification and Review of Ground Performance
• 19.0 Change Management for Unexpected Ground Conditions
• 20.0 Document Control, Records Management and Review Schedule

Legislation & References

• Work Health and Safety Act 2011 (Cth and relevant state/territory variants)
• Work Health and Safety Regulation 2011 (and state/territory equivalents), including provisions for excavation work
• Safe Work Australia – Code of Practice: Excavation Work
• Safe Work Australia – Code of Practice: Managing the Risk of Falls at Workplaces
• AS 1726: Geotechnical site investigations
• AS 2159: Piling – Design and installation
• AS 4678: Earth-retaining structures
• AS 5100: Bridge design (geotechnical and foundation provisions)
• AS/NZS ISO 31000: Risk management – Guidelines
• AS 2870: Residential slabs and footings (where applicable to building work)