Solution

As part of the solution, VISION conducted additional geotechnical investigations, including machine boreholes, cone penetration tests (CPTs) & laboratory testing, to accurately characterise the site's complex geology & soil conditions, particularly to inform the requirements for raising the building. An addendum geotechnical report was prepared, outlining ground treatment options such as undercutting, preloading, and rigid inclusions.

It also included detailed geotechnical recommendations for the contractor’s selected tender design option: bored concrete pile foundations, with specific embedment depths into moderately to slightly weathered basalt to support the elevated structure. A tailored construction monitoring programme was implemented in collaboration with the contractor and piling subcontractor, with VISION engineering geologists on-site to inspect pile excavations, confirm rock levels, and ensure alignment with the design specifications, all while effectively managing the project timeline amidst regional lockdown challenges.

Upon completion, PS4 certification was issued for the ground conditions within the bored pile excavations, providing assurance for the foundation design & supporting the project's engineering decisions.

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