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Pages 7-11

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From page 7...
... 7 C H A P T E R 2 Geotechnical Uncertainty and Risk Introduction For many civil infrastructure projects, uncertainties regarding subsurface soil and rock conditions are a significant contributor to the overall technical and financial risks for the project (National Research Council [NRC] 1984, Institution of Civil Engineers [ICE]
From page 8...
... 8 2.3.1 Technical Risk Geotechnical-related technical risks are often attributed to weak or soft soils, loose sands, expansive clays, and jointed rock among other causes. Geotechnical failures may be related to the following: • Global or local stability (i.e., exceeding the strength limit state)
From page 9...
... 9 respondents indicated geotechnical-related problems frequently caused cost overruns, schedule overruns, and construction claims resulting in additional costs ranging from at least 5 percent to more than 25 percent of the project cost. Among the most common geotechnical-related causes of cost and schedule overruns, claims, and change orders were (i)
From page 10...
... 10 provide geotechnical risk management tools that can be used to implement those strategies on typical design-build projects. Load and Resistance Factor Design and Subsurface Investigation LRFD is a reliability-based approach that replaces the single factor of safety that is used in allowable stress design (ASD)
From page 11...
... 11 Chapter 2 References AASHTO.

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