Understanding critical stability factors: Integrating old and new data to improve foundation stability assessments

1.1 USING TELEVIEWERS AND 3D MODELLING FOR FOUNDATION ASSESSMENTS

Televiewer and 3D geospatial modelling tools bring significant benefits to large-scale engineering and geological projects, particularly during the safety review and maintenance phases of complex infrastructure like dams and water-retaining structures. These tools augment traditional surface mapping and limited borehole data, delivering a clearer, more complete picture of the foundation rock mass. The result is more reliable design, safety, and risk management decisions.

1.2 FILLING GAPS IN BOREHOLE DATA

For historic boreholes where core samples might be missing or data is sparse, televiewers can help provide new, detailed insights. Acoustic and optical televiewers allow us to capture the orientation, size, and behaviour of foundation defects, turning what would be costly, invasive investigations into more efficient, low-risk processes. This is especially useful in well-maintained boreholes, like those used for dam drains, where televiewer data lets us understand the continuity, shape, and orientation of faults and smaller defects.

1.3 UNDERSTANDING FOUNDATION DEFECTS AND STABILITY

Understanding these factors is critical for assessing foundation behaviour, spotting potential failure modes, and evaluating foundation strength and stability. This data-driven approach not only improves structural assessments but also guides risk management and economic decisions for infrastructure upgrades. Reliable investigations using these tools can help ensure that safety and upgrade assessments are based on thorough and realistic analysis.