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Excavation Shoring, Benching and Shielding Risk Assessment

Excavation Shoring, Benching and Shielding Risk Assessment

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Excavation Shoring, Benching and Shielding Risk Assessment

Product Overview

Identify and control organisational risks associated with Excavation Shoring, Benching and Shielding through a structured, management-level Risk Assessment that focuses on planning, design oversight, procurement, supervision and system controls. This document supports demonstrable Due Diligence under the WHS Act, helping to minimise organisational exposure, regulatory enforcement action and operational liability.

Risk Categories & Hazards Covered

This document assesses risks and outlines management controls for:

  • WHS Governance, Roles and Legal Compliance: Assessment of PCBU duties, officer due diligence, allocation of responsibilities and verification processes for excavation and trenching activities.
  • Geotechnical Assessment and Soil Classification: Management of geotechnical investigations, soil testing, classification methodologies and the use of competent persons to inform shoring and benching decisions.
  • Excavation and Support System Design Management: Oversight of engineering design, verification, design change control and approval pathways for shoring, shielding and earth retention systems.
  • Planning of Benching, Sloping and Trenching Geometry: Protocols for determining excavation dimensions, slope angles, benching configurations and maximum depths in line with geotechnical advice and regulatory requirements.
  • Procurement, Inspection and Maintenance of Shoring and Shielding: Systems for selecting compliant equipment, pre-use inspection, scheduled maintenance, repair, and removal from service of damaged or non-conforming components.
  • Installation and Removal System Management: Control of methods, sequencing, supervision and verification for the safe installation, adjustment and removal of shoring, benching and shielding systems.
  • Ground Stability Monitoring and Change Management: Management of inspections, trigger points, monitoring frequencies and response procedures for ground movement, water ingress and changing site conditions.
  • Worker Competency, Training and Authorisation: Assessment of competency requirements, licensing, training programs, verification of competency (VOC) and authorisation processes for personnel involved in excavation support activities.
  • Planning for Underground Services and Adjacent Structures: Controls for service locating, isolation, consultation with asset owners, and engineering assessment of impacts on nearby buildings, roads and infrastructure.
  • Access, Egress and Exclusion Zone Management: Protocols for safe access and escape routes, edge protection, traffic interfaces and exclusion zones for workers, plant and the public around excavations.
  • Cave-In and Sudden Soil Collapse Emergency Planning: Development of emergency response procedures, rescue planning, equipment selection and coordination with emergency services for trench collapse scenarios.
  • Contractor and Subcontractor Management: Systems for prequalification, scope definition, interface management, consultation, coordination and monitoring of contractors performing trenching and shoring works.
  • Documentation, Record-Keeping and Review: Requirements for maintaining geotechnical reports, design documentation, inspections, permits, training records and periodic reviews of excavation controls.
  • Fatigue, Work Scheduling and Environmental Conditions: Management of working hours, shift patterns, heat, cold, rain, wind and other environmental factors that may affect ground stability and worker performance.

Who is this for?

This Risk Assessment is designed for Business Owners, Construction Managers, Project Engineers and Safety Managers responsible for planning, approving and overseeing excavation shoring, benching and shielding operations across projects and worksites.

Hazards & Risks Covered

Hazard Risk Description
1. WHS Governance, Roles and Legal Compliance
  • • Lack of clear WHS responsibilities for excavation shoring, benching and shielding activities
  • • Inadequate understanding of WHS Act 2011 and WHS Regulations (particularly excavation and trenching requirements)
  • • No documented approval process for high‑risk excavation activities (including trenches, benching and shoring systems)
  • • Failure to identify and appoint a competent person for excavation design, inspection and supervision
  • • Poor integration of excavation risk management into the broader WHS management system
  • • Ineffective consultation with workers and Health and Safety Representatives (HSRs) on excavation shoring and shielding risks
  • • Insufficient review of compliance with relevant Australian Standards, Codes of Practice and manufacturer instructions for shoring and shielding systems
2. Geotechnical Assessment and Soil Classification
  • • Absence of formal geotechnical assessment prior to excavation, benching or shoring design
  • • Incorrect or overly simplistic soil classification leading to inadequate support design
  • • Failure to account for layered or variable soil conditions and fill materials
  • • Not considering groundwater, seepage, previous disturbances or underground services that affect ground stability
  • • Reliance on operator judgement instead of documented geotechnical input for deep trenches or pits
  • • No system for re‑assessment of soil conditions following weather events, vibration, or changes in excavation geometry
3. Excavation and Support System Design Management
  • • No formal design process for shoring, benching, shielding and slope or bench digging arrangements
  • • Use of generic or unsuitable shoring designs that do not reflect site‑specific conditions or excavation geometry
  • • Inadequate design consideration of adjacent loads such as plant, stockpiles, roads, or structures near the excavation edge
  • • Lack of clear design documentation for benching (creating safe flat zones) and benching operations on trench sides
  • • Omission of load ratings, installation sequences and limitations for trench boxes, shields and proprietary shoring systems
  • • Design not considering staged excavation, shield erection in trenches, and sequential installation or removal of supports
  • • Poor management of design changes in response to evolving site conditions
4. Planning of Benching, Sloping and Trenching Geometry
  • • Ad‑hoc decisions on bench heights, widths and slope angles without reference to engineering design
  • • Inadequate allowance for safe working platforms, access routes and escape paths on benched surfaces
  • • Over‑steep slopes or insufficient benches leading to progressive slope failure or sudden soil collapse
  • • Failure to plan for transitions between sloped, benched and shored sections of a trench or pit
  • • No formal review of how trench length, width and depth influence support requirements and stability
  • • Poor integration of benching plans with earthmoving methodology and plant selection
5. Procurement, Inspection and Maintenance of Shoring, Shielding and Earth Retention Systems
  • • Procurement of shoring, trench boxes or shields without verification of engineering certification and compliance
  • • Use of damaged, incompatible or untested shoring and support components
  • • Inadequate system to track inspections, maintenance and repairs of shoring equipment and earth retention systems
  • • Mixing components from different manufacturers leading to loss of design capacity
  • • No established criteria for quarantining or discarding defective supports, trench boxes or shields
  • • Failure to maintain documentation such as certificates, load ratings and manufacturer instructions
6. Installation and Removal System Management for Shoring, Benching and Shielding
  • • Lack of a documented system for safe sequences when installing shoring for trenches, installing trench boxes, or erecting shields in trenches
  • • Uncontrolled removal of trench supports, leading to premature collapse or loss of ground support
  • • Inadequate supervision and competency of crews performing shoring support systems installation
  • • Failure to plan for progressive support installation as the excavation deepens and benching changes
  • • No documented method for maintaining stable ground support when modifying existing shoring or benching arrangements
  • • Poor control of exclusion zones during installation and removal of trench supports and shields
7. Ground Stability Monitoring and Change Management
  • • No systematic monitoring program for ground movement, cracks or signs of instability in benched or shored excavations
  • • Failure to detect early warning signs before a sudden soil collapse or cave‑in event
  • • Inadequate response process when deterioration of ground conditions is observed
  • • Changes to excavation shape, depth or nearby loading not communicated to the competent person
  • • Weather events (rain, flooding, drying, high winds) affecting ground stability without formal reassessment
  • • Poor record‑keeping of inspections, observed defects and corrective actions
8. Worker Competency, Training and Authorisation
  • • Workers involved in trenching and shoring lacking formal training in excavation support principles and hazards
  • • Supervisors not competent in reading shoring and benching designs and applying system controls
  • • No formal authorisation system for personnel to manage or sign off excavation and shoring activities
  • • Insufficient training on cave‑in rescue plan roles, emergency triggers and communication protocols
  • • High reliance on informal, on‑the‑job training without competency assessment
  • • Limited understanding of limitations and correct usage of trench boxes, shields and hydraulic shoring systems
9. Planning for Services, Adjacent Structures and External Influences
  • • Inadequate identification and management of underground services intersecting with trenching and shoring works
  • • Failure to consider influence of adjacent buildings, roads, rail lines or retaining walls on excavation stability
  • • Construction traffic, heavy plant or spoil stockpiles placed too close to the edge of benched or shored excavations
  • • Vibration from compaction, traffic or plant undermining the design assumptions of support systems
  • • Lack of coordination with utility owners, asset managers and local authorities on allowable excavation methods and support requirements
10. Access, Egress and Exclusion Zone Management
  • • No systematic planning for safe entry and exit points for people working within benched or shored excavations
  • • Uncontrolled access to trenching areas by unauthorised workers or the public
  • • Inadequate edge protection around open excavations, leading to falls or vehicular ingress
  • • Poor definition and enforcement of exclusion zones for plant and material movement near excavation edges
  • • Lack of secondary escape routes in long trenches or deep pits in the event of soil collapse
11. Cave‑In and Sudden Soil Collapse Emergency Planning
  • • Absence of a documented cave‑in rescue plan for trenching and shoring activities
  • • Emergency response relying on ad‑hoc actions rather than rehearsed procedures
  • • Inadequate provision of rescue resources and equipment appropriate to excavation environments
  • • Poor coordination with external emergency services regarding access, capabilities and response times
  • • Insufficient training of supervisors and workers on reaction to sudden soil collapse and safe rescue principles
  • • Failure to account for secondary collapse risk during rescue operations
12. Contractor and Subcontractor Management for Trenching and Shoring
  • • Engagement of contractors for trenching and shoring without adequate pre‑qualification of their WHS systems and technical capability
  • • Misalignment between principal contractor procedures and subcontractor practices for benching and excavation support
  • • Inconsistent application of risk controls for shoring, benching and shielding across multiple contractors on the same site
  • • Inadequate oversight of contractor compliance with excavation permits, design requirements and inspection regimes
  • • Poor communication of changes in excavation design, support methods or cave‑in rescue plan to subcontractors
13. Documentation, Record‑Keeping and Review of Excavation Controls
  • • Inadequate documentation of excavation risk assessments, permits, inspections and design approvals
  • • Loss or fragmentation of records across multiple systems, making it difficult to demonstrate compliance
  • • Failure to review incident data, near misses and inspection findings to improve shoring and benching systems
  • • Out‑of‑date procedures and design guidelines remaining in circulation and being applied on new projects
  • • Limited management visibility of systemic issues affecting trenching and shoring safety performance
14. Fatigue, Work Scheduling and Environmental Conditions Management
  • • Long shifts or inadequate breaks leading to fatigue among workers installing or inspecting shoring systems
  • • Pressure to accelerate trenching and shoring programs resulting in shortcuts or non‑compliance with controls
  • • Extreme heat, cold, rain or poor visibility affecting judgement and increasing the likelihood of errors in support installation or inspection
  • • Insufficient planning for seasonal weather patterns that impact soil moisture and excavation stability

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Legislation & References

This document was researched and developed to align with:

  • Work Health and Safety Act 2011
  • Work Health and Safety Regulations 2017
  • Excavation Work Code of Practice: Guidance on managing risks associated with excavation and trenching activities.
  • Managing the Risk of Falls at Workplaces Code of Practice: Controls for work near excavation edges and access/egress arrangements.
  • How to Manage Work Health and Safety Risks Code of Practice: Framework for identifying, assessing and controlling WHS risks.
  • AS/NZS ISO 31000:2018: Risk management — Guidelines.
  • AS 2159 Piling – Design and Installation: Relevant principles for ground support, stability and adjacent structure considerations.
  • AS 1742.3 Manual of Uniform Traffic Control Devices – Traffic Control for Works on Roads: Guidance for managing traffic interfaces around road-side excavations.
  • AS/NZS 4801 (superseded) / ISO 45001:2018: Occupational health and safety management systems – requirements and guidance for systematic WHS management.
Standard Risk Assessment Features (Click to Expand)
  • Comprehensive hazard identification for all activities
  • Risk rating matrix with likelihood and consequence analysis
  • Existing control measures evaluation
  • Residual risk assessment after controls
  • Hierarchy of controls recommendations
  • Action priority rankings
  • Review and monitoring requirements
  • Consultation and communication records
  • Legal compliance references
  • Sign-off and approval sections

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