Surveyor holding a survey pole on a gravel plain with low mounds under a cloudy sky

Understanding Ground Conditions

Ground conditions are rarely uniform and never fully known before work begins. The information available at the planning stage — borehole logs, laboratory test results, historical data — describes the ground at discrete points and specific moments. What lies between those points, and how the ground will respond when it is disturbed, is a question that investigation can narrow but not eliminate.

Tall excavated soil wall beside a construction site with a worker standing at its base

Geotechnical Risk

Geotechnical risk is the consequence of that gap. It is not the presence of difficult ground — difficult ground can be designed for. It is the distance between what was assumed and what the ground actually does under changed conditions, and the decisions that were made in that gap without adequate understanding of what was at stake."

Aspects of geotechnical characterisation

Ground Conditions Model

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Rock Mass Characterisation

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Geotechnical Domains

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Laboratory Testing Programs

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Stress Data and Stress Maps

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Wireline and Image Log Interpretation

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Geotechnical Design Parameters

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