Managing Geotechnical Risks in Design–Build Projects (2018) / Chapter Skim
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3 Chapter 1: Background 1.1 The Research Problem According to NCHRP Synthesis 429: Geotechnical Information Practices in Design-Build Projects (Gransberg and Loulakis 2011) and the most recent American Society of Civil Engineers (ASCE)
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4 management principles require the owner to disclose to bidders virtually all geotechnical information in the control of the owner. On DB projects, the risk of differing site conditions is not as clear (Clark and Borst 2002)
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5 • To quantify and compare the costs and benefits of the owner completing the geotechnical investigation before advertising a DB project versus assigning that responsibility to the design-builder on a post-award basis. • To prepare a recommended guideline for managing geotechnical risk in DB projects.
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6 • Creating a safe environment for workers and the traveling public. The increased use of alternative project delivery methods has caused the above issues to become increasingly interrelated and created a project management challenge for DOTs.
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7 1.2 Background One of the most important issues confronting owners, designers and contractors on any transportation project is the nature and predictability of geotechnical conditions. Geotechnical conditions not only have an enormous impact on project design, but they directly impact project cost and schedule.
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8 • What are the critical geotechnical variables that must be known for the DOT to develop a preliminary design for funding and bidding purposes? • What critical geotechnical variables must be known for the design-builder to complete a workable design?
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9 Table 1.1 Project Characteristics that Indicate a Given Project Is a Poor Candidate for DB Project Delivery Found in the Literature (Gransberg and Loulakis 2011) Project Characteristic Source • High risk of differing site conditions • Low probability to be able to expedite design and construction schedule • High possibility of change to phases of work Blanchard 2007 • The design must be complete for accurate pricing • The design must be complete for permitting or third party issues Gransberg et al.
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10 the design process. The issue also exposes the DOT to either a major differing site conditions claim or a design-builder that has underpriced the job and is in financial trouble – possibly to the point of default.
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11 contractor installing instrumentation in the fill to permit MnDOT to monitor settlement after construction. Not all projects delivered by DB have the happy ending described above.
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12 • How should the format of the traditional geotechnical risk register/analysis change when the owner is no longer the consulting engineer's client on DB contracts? • At what point is the geotechnical uncertainty so great that it precludes DB project delivery?
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13 1. Identify, analyze, and understand the current models for successful geotechnical risk management on projects delivered by the DB delivery method.
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14 1. What project characteristics indicate that a substantial return on investment on the cost of formal geotechnical risk investigation can be achieved?
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15 4. Does a geotechnical risk management program actually increase collaboration and integration and if so, how can a valuation be assigned to the increase?
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