Manual on Subsurface Investigations (2019) / Chapter Skim
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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]
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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)
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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)
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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)
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From page 11... ...
11 Chapter 2 References AASHTO.
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