Managing Geotechnical Risks in Design–Build Projects (2018) / Chapter Skim
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Pages 117-124
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From page 117... ...
117 Chapter 4: Conclusions and Suggested Research The emerging findings that have been identified and analyzed so far in this research can be summarized in five interrelated elements: Benchmark of current practices; Perceptions of the geotechnical risk; Strategies for aligning the perceived the geotechnical risk; Tools for managing geotechnical risks; and potential Solutions that have been identified to achieve an aligned approach towards managing the geotechnical risks in DB projects. 4.1 Benchmarks: Using the different research instruments explained throughout this report, the following practices of the industry have been identified as the most relevant to depict how the geotechnical risks are being managed: 1.
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From page 118... ...
118 geotechnical/geological conditions from the differing site conditions clause and/or include statements indicating that the geotechnical studies performed by the owner are for reference only and do not constitute basis for a DSC claim.
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From page 119... ...
119 owner thinks it is allocating the geotechnical risks to the contractor in its DB RFP, causing the design-builders to perceive a higher level of risk 2. Previous research proved that higher levels of perceived risk result in inclusion of higher contingencies to cover that risk.
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From page 120... ...
120 b. Use DB process to address other geotechnical issues by involving third party stakeholders as early as practical in project development and delivery.
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From page 121... ...
121 Table 4.1 List of Tools Tool Source Competitor designated boring locations UT+ Competitors permitted to conduct supplementary borings at own expense MN+ Contractor produced GBR-C OH Define no-go zones for geotechnical ATCs UT+ Include differing site conditions clause SC+ Include life cycle criteria in best value award scheme TX+ Multiple NTPs with one designated for geotechnical investigation, design, and a second specifically to commence excavations, utility work, etc. Literature Negotiated GBR interpretation WA+ Progressive DB MD Request of geotechnical ATCs CA+ Scope validation period VA Unit prices for contaminated material, over-excavation, etc.
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From page 122... ...
122 4.5.Potential Solutions to Achieve an Aligned Approach to Geotechnical Risk The primary emerging finding of this research is that there is a need to achieve an aligned approach towards managing geotechnical risks in DB projects. The disconnect between owners and contractors as to who owns the geotechnical risk in DB projects creates an overestimation of the risks that lead to unnecessary contingencies as a measure of protection from overexposure.
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From page 123... ...
123 subsurface conditions early on the project so any differing site condition is dealt with before advancing on the next stages of the project.
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From page 124... ...
124 cross-case analysis of the benefits, costs, and quality. This would be coupled by an analysis of a detailed record of geotechnical issue resolution kept during the pilot project's life cycle.
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