Geotechnical_Data_Report

Geotechnical_Data_Report - CE 140 Soil Mechanics...

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CE 140 Soil Mechanics Geotechnical Data Report Introduction A geotechnical investigation is necessary for most civil engineering works. The depth of the investigation is a function of the risk of the work, the loads to be imposed on the soil, the history of the site, and the economy of the project. Geotechnical investigations have four major components: literature review, field testing, laboratory testing, and result interpretation/recommendation. Literature Review The literature review examines existing information available relevant to the site. Though a literature review can provide useful information related to the site conditions, it is not a sufficient replacement for a thorough site-specific testing program. Information can include historical documents relating to use of the site, agricultural reports, aerial photographs, previous geotechnical studies (both onsite and for nearby sites), and geologic maps from the USGS. Historical documentation of the site usage can be difficult to obtain, but can uncover important information that could affect the quality of the site for the current projects. Often in urban settings, sites can contain debris from old structures, garbage (remember there wasn’t any sanitation engineering!), barrels of chemical waste (oil, sludge waste, etc) and contaminated soils. Discovery of such conditions can require much more effort and money for the geotechnical investigation. Garbage and debris may need to be removed and replaced; contaminated soils must be cleaned up or removed. Any contamination of the site often then requires involvement of the local and/or federal Environmental Protection Agencies. Permits for removal and disposal can delay projects for months or even years. Agricultural reports can be useful to determine some soil properties, but often only characteristics relevant to the soils usefulness as an agricultural medium. This information can be useful to determine hydrologic properties of the soil, depth of soil and, to a limited extent, the type of soil encountered. Aerial photographs are helpful to view geologic properties of the site. They can emphasize large-scale geologic characteristics that cannot be easily identified with a site visit. Historic landslides, faults, drainage paths and vegetation changes (relates to hydrologic properties of the soil) can be spotted on aerial photographs. These characteristics may affect decisions regarding the usefulness of the site, necessary stabilization methods and necessary drainage structures.
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This note was uploaded on 09/08/2010 for the course CE 140 at San Jose State University .

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Geotechnical_Data_Report - CE 140 Soil Mechanics...

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