Guidelines for Managing Geotechnical Risks in Design–Build Projects (2018) / Chapter Skim
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Pages 22-27
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22 This chapter focuses on the qualitative analysis of geotechnical risk for the typical DB project. It provides a methodology for assessing the magnitude of the risks identified using the tools found in the previous chapter.
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Qualitative Geotechnical Risk Analysis 23 a qualitative analysis for projects smaller than $10 million, although the agency does not discourage the use of quantitative approach for such projects (Washington State DOT 2014)
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24 Guidelines for Managing Geotechnical Risks in Design–Build Projects The results of the NCHRP Project 24-44 survey of various DOTs showed that in almost all cases, geotechnical risk assessment is performed as part of the overall project risk assessment. In other words, no independent formal geotechnical risk assessment is conducted.
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Qualitative Geotechnical Risk Analysis 25 If any other person deals with issues directly relevant to geotechnical design and construction (such as utility relocation or in some cases structures) , that person should be invited to the risk assessment workshop also.
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26 Guidelines for Managing Geotechnical Risks in Design–Build Projects The "effort to mitigate risk" is the third factor for rating a major risk factor, beyond the likelihood of occurrence and the cost/schedule impact of risk, if it occurs. It allows the analyst to assess the cost and time impact of rectifying any major geotechnical risk.
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Qualitative Geotechnical Risk Analysis 27 medium, or low risk. The threshold values for distinguishing between these levels are somewhat arbitrary and can be calibrated by a specific agency on the basis of their experience and as they use the approach in several projects.
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