Adelaide & South Australia

2D & 3D Rock Modelling | Adelaide

Numerical Modelling Services for Foundations, Slopes, Excavations & Retaining Structures in Adelaide and South Australia

Adelaide’s varied geology, from reactive soils and uncontrolled fill on the metropolitan plain to weathered Adelaidean metasediments in the Hills, means that ground behaviour under structural load is not always predictable from field investigation alone. Our numerical modelling services help developers, engineers, and contractors understand how site conditions will perform before construction begins, making it easier to refine solutions and reduce risk at the design stage.

Talk to Our Experts
  • 50+ Years Combined Experience
  • ISO Certified Management Systems
  • Engineers Australia Members
  • Australian Geomechanics Society Affiliates
  • Testing Undertaken by NATA-Accredited Laboratories Where Required

What Is 2D & 3D Rock Modelling?

Using Numerical Software to Simulate Ground and Structural Behaviour

Numerical modelling is the use of geotechnical software to simulate how soil, rock, and structures interact under applied load. Rather than relying on simplified analytical methods, modelling accounts for the actual site geometry, the engineering properties of the materials present, and the construction sequence, producing a more realistic and defensible picture of ground behaviour than analytical methods alone can provide.

In South Australia’s varied geological setting, this distinction is significant: what appears consistent at surface level can conceal substantial variability at depth, particularly across Adelaide’s Hills Face Zone and eastern metropolitan fringe where weathered Adelaidean metasediments and Precambrian basement rock are commonly encountered.

At BHM Geotechnical, we provide practical numerical modelling services in Adelaide, including:

2D cross-sectional analysis of soil and rock conditions
3D geological modelling of subsurface conditions and structure interaction
Rock mechanics modelling for excavations, foundations, and slopes in rock
Staged construction modelling to simulate sequential excavation or loading
Settlement prediction and lateral ground movement analysis
Slope stability modelling for natural and engineered slopes
Retaining wall and basement design verification through numerical analysis
Reporting to support design, regulatory submissions, and construction documentation

These services support residential, commercial, infrastructure, and civil projects across Adelaide and South Australia.

2D & 3D Numerical Modelling Services

Selecting the Right Level of Analysis for Your Project

The appropriate modelling approach depends on the complexity of the site, the geometry of the structure, and the degree of variability in the ground conditions. Where 3D geological modelling or rock mechanics modelling is warranted, simpler analytical methods will not capture the full picture.

01

2D Numerical Analysis

2D analysis produces cross-sectional models that show critical design details along a defined alignment.

Our 2D analysis typically includes

  • Cross-sectional modelling of soil and rock profiles from investigation data
  • Analysis of foundation, retaining wall, or slope behaviour under applied load
  • Settlement and lateral movement predictions for proposed structures
  • Staged excavation modelling to evaluate stability at each construction phase
  • Factor of safety calculations for slopes and retaining structures
  • Clear cross-section outputs suitable for design documentation and approval

2D analysis is an efficient and reliable basis for design decisions where ground conditions and loading can be adequately represented in a single cross-section.

02

3D Geological Modelling

3D geological modelling produces realistic simulations of subsurface conditions and structural performance where lateral variability, irregular geometry, or complex loading cannot be captured in two dimensions.

Our 3D modelling typically includes

  • Three-dimensional simulation of subsurface stratigraphy and rock profiles
  • Modelling of irregular structural geometries and three-dimensional loading conditions
  • Visualisation of subsurface conditions to support design team communication
  • Integration of borehole, test pit, and geophysical data into a coherent site model
  • Assessment of differential settlement across variable ground profiles
  • Outputs structured to support design, approval, and construction documentation

3D modelling is particularly valuable across Adelaide’s Hills Face Zone and eastern metropolitan fringe, where fault-controlled rock profiles and weathered Adelaidean metasediments can change significantly across a single site.

03

Rock Mechanics Modelling

Rock mechanics modelling assesses how rock masses respond to excavation, structural loads, and in-situ stresses, providing a quantitative design basis where rock governs.

Our rock mechanics modelling typically includes

  • Characterisation of rock mass strength and deformation properties from field and laboratory data
  • Modelling of rock slope stability for natural escarpments and engineered cuts
  • Analysis of excavation behaviour in rock, including batter angles and support requirements
  • Foundation design verification in rock, including bearing capacity and settlement
  • Assessment of rock bolting, shotcrete, or other support systems where required
  • Reporting to support design, specification, and regulatory approval

Rock mechanics modelling is most commonly required on projects in Adelaide’s Hills, the Hills Face Zone, and the eastern metropolitan fringe where weathered and fresh rock conditions are encountered during excavation or foundation construction.

04

When Is Numerical Modelling Required?

Common triggers may include

  • Deep or staged excavations where stability at each construction phase must be verified
  • Basement construction in variable or weathered rock requiring ground movement quantification
  • Retaining wall design in rock or mixed soil and rock profiles
  • Slope stability assessment for natural slopes or engineered cuts in the Hills Face Zone
  • Foundation design where rock depth varies significantly across the site footprint
  • Projects in fault-controlled geological settings affecting structural behaviour
  • Infrastructure projects requiring assessment of ground movement under linear loading
  • Development applications or regulatory submissions requiring documented numerical analysis
  • Review of existing designs where encountered conditions differ from design assumptions

Recognising these triggers before design decisions are locked in allows modelling to shape the solution rather than review it.

Get Your Site Assessed

Speak With Adelaide’s Geotechnical Modelling Specialists

We provide 2D analysis, 3D geological modelling, and rock mechanics modelling for projects throughout Adelaide and South Australia.

    Why Choose BHM Geotechnical?

    Seasoned Geotechnical Modelling Consultants in Adelaide

    50+ Years Combined Experience

    BHM Geotechnical brings geotechnical engineering expertise, industry-standard modelling software, and direct experience of Adelaide’s varied geological conditions to every modelling engagement.

    Our assessments give design teams the quantitative basis to make confident decisions before they commit to a construction approach.

    Geotechnical Engineering Expertise

    Modelling led by qualified geotechnical engineers with experience across Adelaide’s metropolitan plain, Hills Face Zone, and eastern fringe.

    Industry-Standard Modelling Software

    Analysis carried out using commercially available geotechnical software matched to the project type, 2D, 3D, or rock mechanics as required.

    Practical, Design-Focused Reporting

    Reports structured to support design decisions, approval submissions, and construction documentation, not just to satisfy a technical requirement.

    Adelaide Geological Knowledge

    Working knowledge of weathered Adelaidean metasediments, Precambrian basement, reactive soils, and fault-influenced profiles specific to South Australia.

    Responsive Project Delivery

    Efficient modelling, analysis, and reporting to keep design and construction programmes on track.

    2D & 3D Rock Modelling for Construction, Development & Infrastructure

    Projects Where Numerical Modelling Adds the Most Value

    Understanding how ground conditions will behave under structural load is often essential before design can be finalised or construction can proceed.

    Our modelling services support:

    01

    Basement & Substructure Design

    Model ground behaviour around deep basements and substructures in variable soil and rock to refine foundation and retention design.

    02

    Slope Stability Assessment

    Assess the stability of natural slopes, engineered cuts, and embankments across Adelaide’s Hills Face Zone and metropolitan fringe under static and dynamic loading conditions.

    03

    Staged Excavation Planning

    Simulate each phase of a complex excavation sequence to verify stability, predict ground movement, and optimise the construction programme.

    04

    Retaining Wall & Earth Retention Design

    Verify the performance of proposed retaining structures in rock or mixed profiles where analytical methods alone are not sufficient.

    05

    Infrastructure & Civil Projects

    Support bridge abutment design, road and rail cuttings, and other infrastructure where ground-structure interaction under load must be quantified.

    06

    Development & Regulatory Submissions

    Provide documented numerical analysis to support development applications or regulatory review of geotechnically sensitive projects.

    What Are the Common Signs That Numerical Modelling May Be Needed?

    Modelling is not only required when ground conditions are visibly problematic. Variable rock depth across a site, steep terrain in the Adelaide Hills, a structure with an irregular footprint on variable ground, or an excavation that proceeds in stages can all indicate that conventional analytical methods will not give the design team sufficient confidence.

    Identifying the need for modelling before design decisions are finalised (rather than after excavation has started and an unanticipated condition has emerged) is where it provides the most value.

    The Numerical Modelling Process

    How We Carry Out 2D & 3D Rock Modelling

    01

    Site Review & Investigation Data Collection

    Review available geotechnical data, site history, project design information, and geological mapping to establish the basis for modelling.

    02

    Ground Model Development

    Develop a representative ground model characterising soil and rock units by their engineering properties from borehole, test pit, laboratory, and geophysical data.

    03

    Model Build & Boundary Conditions

    Build the numerical model in appropriate geotechnical software, applying geometry, material properties, structural elements, and boundary conditions consistent with the design and construction sequence.

    04

    Analysis & Sensitivity Review

    Run the analysis under relevant loading conditions and review results for sensitivity to parameter uncertainty and critical design scenarios.

    05

    Reporting & Design Recommendations

    Prepare a report that presents the modelling methodology, key outputs, and design recommendations, structured to support design finalisation, approval, and construction.

    Why Numerical Modelling Is Important

    Why 2D & 3D Rock Modelling Before Construction Matters

    Resolve Design Challenges at the Right Stage

    Ground-structure interaction issues identified during design are straightforward to address; the same issues identified during construction are not.

    Replace Conservative Assumptions With Evidence

    Quantifying actual ground behaviour under load avoids the over-conservative design that results from applying blanket factors to uncertain conditions.

    Reduce Unnecessary Design Cost

    Foundations and retaining structures can be optimised when ground performance is known rather than assumed.

    Confirm Staged Construction Safety

    Each phase of a complex excavation or construction sequence can be confirmed as stable before it proceeds.

    Support Approvals on Sensitive Sites

    Documented numerical analysis gives certifiers and regulators a defensible technical basis for geotechnically complex project approvals.

    Give the Whole Team Confidence

    A shared, quantitative picture of how the ground will behave removes uncertainty from design, construction, and project management decisions.

    Explore Related Geotechnical Services

    Related Rock Mechanics & Geotechnical Services

    Rock Face Assessments

    Evaluate the stability and condition of exposed rock faces encountered during or after excavation.

    Slope Stability Assessments

    Investigate natural and engineered slope conditions and provide recommendations for stabilisation or ongoing monitoring.

    Excavation Advice

    Advise on excavation methods, batter angles, and support requirements suited to specific site conditions.

    Foundation Assessments

    Assess foundation conditions and develop design recommendations for structures in soil and rock.

    Geotechnical Causation Assessments

    Determine the factors contributing to ground movement, structural distress, or unanticipated site conditions.

    Geotechnical Site Investigations

    Characterise site conditions through drilling, sampling, and laboratory testing to provide the data that underpins modelling and design.

    Trusted for Geotechnical Modelling Across Adelaide

    BHM Geotechnical supports developers, engineers, and contractors with practical modelling services, clear reporting, and responsive delivery throughout Adelaide and South Australia.

    The HDD ground investigation gave our drilling team the confidence to proceed with the alignment as planned. The report was clear, practical, and delivered exactly when we needed it.
    D
    BHM identified subsurface conditions on our pipeline corridor that would have caused significant issues if left undiscovered. Their input directly shaped our construction approach.
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    Responsive, thorough, and easy to coordinate with on tight infrastructure timelines.
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    Understand Your Site’s Behaviour Before You Design, Excavate, or Build

    Our 2D and 3D numerical modelling services provide the analysis needed to quantify ground behaviour under load, refine design solutions, and reduce construction risk before work begins on site.

    Get a Custom Solution

    Have Questions?
    Let’s Clear Them Up

    What is the difference between 2D analysis and 3D geological modelling?

    2D analysis models ground behaviour along a single cross-section and is appropriate where conditions are consistent along that alignment. 3D geological modelling captures lateral variability across a site and is used where the geometry of the ground or the structure cannot be adequately represented in two dimensions.

    What is rock mechanics modelling used for?

    Rock mechanics modelling is used to assess how rock masses respond to excavation, applied load, and in-situ stresses. It is most commonly applied to foundation design in rock, slope assessment in the Hills and eastern suburbs, and excavation planning where rock conditions govern the design outcome.

    When should numerical modelling be considered?

    Modelling should be considered when ground conditions are variable, construction is staged, loading is complex, or the consequences of an unanticipated ground response would be significant. In Adelaide, projects in the Hills Face Zone and eastern metropolitan fringe most commonly warrant modelling due to the variability of weathered rock profiles.

    What software is used for geotechnical modelling?

    We use commercially available, industry-standard geotechnical software selected to match the type of analysis required, whether 2D, 3D geological modelling, or rock mechanics modelling. The software choice is part of our scope definition at the start of each engagement.

    Can BHM carry out site investigations and modelling under the same engagement?

    Yes. Investigation data is the foundation of any reliable model, and having the same team carry out both ensures the investigation is designed to capture what the model needs. We provide geotechnical site investigations across South Australia as a standalone service or in combination with modelling.

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