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hw3 - 3 A soil has a liquid limit of 41 and a plastic limit...

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Dr. Marwa Hassan [email protected] CM3400: Assignment No. 3 Due: 4/22/09 Soil: 1. A three-story, 80m wide x 100m long residential building is to be built on a site underlain by silty clay. This soil has probably poor engineering properties and average uniformity. There is no indication of previous fill or grading at the site, and the groundwater table is believed to be 30m below the ground surface. We anticipate supporting the building on spread footing foundations located 1.7m below the surface. There are no accessibility problems at the site. a. How many exploratory borings will be required and to what depth? b. What type of drilling equipment and sampler would you recommend for this project? 2. Explain the operation of the standard penetration test and the cone penetration test. Discuss the advantages and disadvantages of each method.
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Unformatted text preview: 3. A soil has a liquid limit of 41 and a plastic limit of 20. A moisture content test performed on an undisturbed sample yielded the following results: Mass of soil + can before placing in oven: 85.3g Mass of soil + can after removal from oven: 65.7g Mass of can: 19.7g Compute the following: r The plasticity index r The moisture content r The liquidity index r Present a qualitative description of this soil at its in-situ moisture content r Describe this soil in terms of the plasticity chart Wood: 1. Discuss the advantages and disadvantages of creosote as a wood preservative. 2. Define equilibrium moisture content. 3. Discuss the anisotropic nature of wood. How does this phenomenon affect the performance of wood?...
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