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The A83 trunk road in Argyll and Bute, Scotland, frequently closes due to slope instability, especially at Glen Croe near the Rest and Be Thankful viewpoint. After a major landslide in September 2022, the Scottish Government sought a permanent solution to mitigate the ongoing risk of debris flow hazards to road users.
Given the site’s challenging nature, traditional ground investigation methods were limited. Therefore, non-intrusive geophysical surveys were employed, including Primary Wave Seismic Refraction Tomography (P-SRT), Multichannel Analysis of Surface Waves (MASW), Electrical Resistivity Tomography (ERT), and Induced Polarisation-Potential (IP).
These methods provided extensive depth to bedrock data in a complex geological environment, enabling the creation of a 3D ground model. This model informs foundation designs, ensuring structures are placed in competent rock. Ultimately, this approach allows for the construction of robust and resilient landslide mitigation structures.