Answered: 3. The soil profile at a site for a…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.15P

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Transcribed Image Text:3. The soil profile at a site for a proposed office building consists of a layer of fine sand 9.9m thick above a layer of soft normally consolidated clay 3m thick. Below the soft clay is a deposit of coarse sand. The groundwater table was observed to be 3.5m below ground level. The void ratio of the sand is 0.8 and the water content of the clay is 45%. The building will impose a vertical stress increase of 150 KPa at the middle of the clay layer. Estimate the primary consolidation settlement of the clay. Assume that the soil above the water table to be saturated. Cc = 0.3 and Gs = 2.7. 3.5m gwt 6.4m Fine sand Clay 3m Coarse sand 4. Assume the same soil stratigraphy as in problem no.3, But now the soil is overconsolidated with an OCR = 2.5, w = 38% and Cs = 0.05. All other soil values given remain unchanged. Determine the primary consolidation settlement of the clay. 5. Assume the same soil stratigraphy and soil parameters as in problem no.4 except that the clay has an OCR of 1.5. Determine the primary consolidation settlement of the clay.

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