InSAR Monitoring to Validate an Innovative Geotechnical Solution
Robroyston – Glasgow, Scotland
Highlights
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Comprehensive Site Review: Conducted an extensive analysis of site investigation data to develop multiple ground model scenarios, accounting for the variability of site conditions.
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Advanced 3D FEA Modelling: Built a detailed three-dimensional Finite Element Analysis (FEA) model to simulate the embankment, Stratum system, and underlying foundation soils.
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Simulating Settlement Behaviour: Assessed consolidation and creep settlements to predict transverse and longitudinal differential settlements under diverse geological scenarios.
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Cost Savings: The acceptance of Tensar’s Stratum system saved the client £0.5 million.
The construction of a new road embankment to Robroyston Station, situated near Glasgow, presented a significant geotechnical challenge. The presence of soft peat pockets in the underlying soil made it necessary to implement robust ground improvement measures. These measures were essential to mitigate the risk of excessive settlement, which could compromise the structural integrity and long-term performance of the embankment and road surface.
Tensar, a leading provider of geotechnical solutions, proposed their innovative Stratum system as a cost-effective alternative to traditional deep-intervention techniques. However, for the Stratum solution to be implemented, it was critical to validate its performance and predict potential differential settlements.
By leveraging state-of-the-art 3D Finite Element Analysis (FEA) modelling and InSAR monitoring, this project successfully demonstrated the efficacy of the Stratum system, resulting in substantial cost savings and a robust geotechnical design.
Introduction
Understanding the Challenges
The Complexity of Peat Soils
Peat soils are highly compressible and prone to settlement under load. In the case of the Robroyston embankment, the variability in peat thickness and composition added complexity to the design process. Differential settlements—variations in settlement across the structure—were a primary concern, as they could lead to uneven road surfaces and long-term maintenance challenges.
The Need for Ground Improvement
Traditional ground improvement techniques, such as deep piling or extensive excavation and replacement, were considered. However, these methods were not only cost-prohibitive but also environmentally disruptive. A more innovative and cost-effective solution was required to meet the project’s technical and budgetary constraints.
Conclusion
The construction of the Robroyston embankment presented a significant geotechnical challenge, but it also offered an opportunity to showcase the potential of innovative solutions like Tensar’s Stratum system. Through meticulous site analysis, advanced 3D FEA modelling, and InSAR validation, we were able to demonstrate the system’s effectiveness and deliver a successful project outcome.
The result was not only a robust and reliable embankment but also substantial cost savings and reduced environmental impact. This project highlights the value of combining cutting-edge technologies with collaborative expertise to tackle complex engineering challenges and deliver superior results.
For more insights into this case and other innovative geotechnical solutions, read this case study next.
