In an era where infrastructure is the backbone of economic growth, the methods we choose to design, execute, and optimise construction projects play a critical role in project success. Tetra Tech Coffey’s Geotechnical Engineer, WaiLeung Ng’s work on the Wangaratta Underpass project demonstrates how geotechnical techniques and value engineering can reshape the way we approach infrastructure challenges.
In this compelling case study titled “Challenges in Construction of Wangaratta Underpass and Geotechnical Engineering Optimisation”, WaiLeung and co-author Mario Vlasich showcase the challenges and successes of the project.
By integrating comprehensive analysis, innovative engineering solutions, and collaborative planning, the Wangaratta project demonstrates Tetra Tech Coffey’s commitment to delivering high quality efficient and sustainable infrastructure projects.
The value engineering approach: a cornerstone of modern construction
Value engineering goes beyond mere cost-cutting; it is about delivering smarter, safer, and more reliable solutions that meet stakeholder needs while enhancing constructability. In the Wangaratta project, a strategic application of value engineering began in the design phase, fostering a culture of innovation and efficiency. This approach enabled the project team to overcome constraints, including limited construction windows due to railway operations and complex geotechnical conditions, ensuring on-time delivery without sacrificing quality or safety.
Key elements in the value engineering lifecycle included reducing materials, simplifying construction methodologies, and maximizing efficiency through collaboration with stakeholders. By proactively addressing these factors, the project team optimized the construction processes, enabling them to execute complex tasks within the confined 60-hour rail occupation window.
Geotechnical optimisation: integrating advanced methods for better outcomes
Geotechnical engineering optimisation was a pivotal factor in this project, with an emphasis on both the Limit Equilibrium Method (LEM) and the Finite Element Method (FEM). LEM was used for initial assessments to achieve a target factor of safety, while FEM helped identify complex failure mechanisms that LEM alone could not detect. By incorporating FEM, the team was able to better anticipate potential site-specific challenges and refine the construction design to reduce risk and optimize material use. This dual-method approach demonstrated the value of integrating robust geotechnical analyses to create adaptable and resilient infrastructure.
The role of pre-fabrication and advanced planning
Wangaratta Underpass Project
Pre-fabrication was another strategy that contributed significantly to the project’s success. Constructing modular components off-site and pre-assembling materials not only sped up on-site operations but also minimized the environmental impact and disruption to local communities. This approach, coupled with 4D modelling to visualize and refine the construction process, allowed the team to enhance the project’s efficiency without compromising on quality.
Safety and stakeholder collaboration: cornerstones of success
The Wangaratta project underscored the importance of safety, which was interwoven with project objectives and stakeholder relationships. By involving all parties—from design through to execution—the team was able to make real-time adjustments that improved both safety and constructability. Engaging stakeholders early and fostering collaborative relationships allowed for flexible design adjustments, minimizing on-site risks and addressing evolving project needs.
Leading the future of infrastructure with value-driven engineering
As demonstrated in the Wangaratta underpass project, value engineering, supported by robust geotechnical analysis and strategic planning, can drive infrastructure projects to new levels of efficiency and safety. By embracing these principles, future projects can not only meet stakeholder requirements but also achieve cost savings, time efficiency, and a high standard of environmental and operational safety.
In an industry where innovation and adaptability are key, adopting value-driven engineering strategies can be the difference between conventional project outcomes and transformative infrastructure solutions. The Wangaratta Underpass project serves as an inspiring example of how the right approach can lead to sustainable, impactful, and resilient infrastructure developments.
For more information in relation to this technical paper, contact the author.
Connect with WaiLeung Ng | Associate Geotechnical Engineer, Tetra Tech Coffey at [email protected]
Paper title: “Challenges in Construction of Wangaratta Underpass and Geotechnical Engineering Optimisation” was presented at ICTG2024 in Sydney Australia in November 2024.
Authors: WaiLeung Ng, Mario Vlasich
About the event
ICTG2024 served as a pivotal gathering, drawing together experts dedicated to advancing sustainable, technology-driven solutions for urban transport infrastructure. The event highlighted the global challenges of transportation infrastructure and underscored the innovative paths forward in geotechnical engineering. Visit the event website 5th ICTG (2024) | 20-22 November 2024