2.5 Geotechnical Summary Report for Pavement Design Development
Upon completion of the field investigation and laboratory testing program, the geotechnical engineer will compile, evaluate, and interpret the data and perform engineering analyses for the design of pavement foundation layers. Additionally, the geotechnical engineer will be responsible for producing a report that presents the subsurface information obtained from the site investigations and provides specific technical recommendations. An example of a geotechnical design report is shown in Table 3-7.
Since the scope, site conditions, and design/construction requirements of each project are unique, the specific contents of a geotechnical design report must be tailored for each project. In order to develop this report, the author must possess detailed knowledge of the facility. The report must identify each soil and rock unit of engineering significance and must provide recommended design parameters for each of these units. A summary of the analysis of all data is required in the report to justify the recommended index and design properties.
Groundwater conditions are particularly important for both design and construction; these conditions should be carefully assessed and described. For every project, the subsurface conditions encountered in the site investigation should be compared with the geologic setting to better understand the nature of the deposits and to predict the degree of variability between borings.
Table of Contents |
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1. Introduction |
2. Scope of Work |
3. Site Description |
4. Field Investigation |
5. Discussion of Laboratory Testing and Significance |
6. Site Condition and Geologic Setting a. Regional Geology b. Site Geology |
7. Discussion of Findings a. Soil and rock properties b. Ground water conditions and drainage c. Chemical analysis d. Organic analysis e. Swell characteristics f. Reactivity with chemical additives |
8. Analyses of Data a. Soil and rock strengths and moduli b. Characteristics and properties of chemically treated soils c. Determination of in situ material properties, if applicable |
9. Conclusions and Recommendations a. Feasibility and use of native materials b. Recommendations regarding borrow materials c. Chemical treatment of native or borrow materials d. Modulus values and strengths of native or borrow materials |
10. References |
List of Appendices Appendix A – Site Plan Appendix B – Geologic Model (or schematic) Appendix C – Boring Location Plans Appendix D – Boring Logs Appendix E – Laboratory Test Results |
List of Figures |
List of Tables |