Manual on Subsurface Investigations (2019) / Chapter Skim
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238 C H A P T E R 1 1 Compiling, Reporting, and Presenting Geotechnical Information Introduction This chapter presents guidelines regarding compiling, reporting, and presenting factual and interpretive geotechnical information for geotechnical data and baseline reports and discusses the contractual implications of geotechnical reports for alternative project delivery methods. Uses of Geotechnical Information Geotechnical information is used to develop and define the ground model for an area or site of interest.
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239 11.3.1 Preexisting Data Resources As discussed in Chapter 3, preexisting information should be compiled and evaluated prior to developing a project-specific subsurface exploration program. A qualified engineer should decide whether the preexisting information is applicable to a project.
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240 11.3.4 In Situ Testing In situ testing of soil or rock can provide representative geotechnical information. In situ testing methods and details of these tests are provided in Chapter 5 of this manual.
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241 11.4.1 Performance Criteria Performance criteria are the tolerable limits for a structure used to develop the basis of design. Geotechnical performance criteria typically include tolerable displacements (e.g., settlement, differential settlement, heave, lateral movement, tilt)
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242 – Slope stability for permanent or temporary slopes with static or dynamic loads • Interpretive information that should be presented for retaining-walls: – Selected wall type (e.g., soil-nail walls, mechanically stabilized walls, secant walls, soldier piles and lagging, anchored or braced, cantilever walls) and the reason for selection – Lateral earth pressure for braced and cantilever walls, hydrostatic load, surcharge load, and dynamic loads – Global stability and the lateral and vertical extent of the earth-retaining structures – Backfill materials and drainage requirements • Interpretive information that should be presented for the pavement and roadway: – Unsuitable materials, frost susceptibility, expansive soils, corrosion of subgrade soils, and potential excavation and replacement – Resilient modulus of subgrade soils – Support capacity (e.g.
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243 11.4.6 Geotechnical Information for LRFD The state agency's geoprofessional preparing an interpretive report must provide the following information to the structural design team for LRFD. Required information may change from one state to the other.
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244 11.5.1 Uncertainty of Geotechnical Information The uncertainty in geotechnical information is related to the unknown subsurface conditions (variation in the depth and lateral extent of subsurface materials and the properties of the materials) , geotechnical performance, and interpretive and predictive models for engineering analysis.
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245 • Appendices with geophysical test reports, boring logs and laboratory test data, preliminary site-specific seismic response analysis, liquefaction analysis, and geoenvironmental analysis, as applicable. 11.5.2.2 Final Geotechnical Report The final geotechnical report is used to provide final geotechnical interpretive information, analysis, and design for the various elements of the project.
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246 11.5.5 Geotechnical Baseline Report In projects with significant earthwork and subsurface excavation, there are many risks that the owner and contractor should recognize. The main risk is related to the subsurface materials and their behavior.
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247 The GBR should be prepared by the design team so that the GBR document is consistent with the developing design, drawings, specifications, and payment items. 11.5.5.3 GBR for Design-Bid-Build Contracts For design-bid-build contracts, the GBR is typically prepared at 50 to 60 percent completion level (Essex 2007)
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248 Contractual Implications of Geotechnical Reports Factual and interpretive reports should be made available to bidders so their bid price and schedule reflect a reasonable understanding of subsurface conditions. This is of particular importance for alternative project delivery methods.
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249 11.6.1.4 Negotiated General Contractor For negotiated general contractor delivery method, the owner selects the most qualified contractor. The final construction cost will be provided as either cost plus a markup or guaranteed maximum price.
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250 Chapter 11 References Essex, R.J.
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