Answered: The figure shows the soil profile at a…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.9P

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Transcribed Image Text:The figure shows the soil profile at a site where you plan to lower the water table. You have results from two consolidation tests, one from the upper 12 ft thick over-consolidated crust, and another from the lower 32 ft thick normally consolidated zone. You plan to lower the water table from its current 12 ft depth to 20 ft below ground surface. The consolidation properties for each layer are shown. Assume that the soft clay in the lower layer remains saturated because of full capillarity. Assume that the lower clay is normally consolidated. Note that the notation Cce means Cc / (1 + eo), etc. (a) Compute O'y the in the middle of each layer before and after the water table is lowered. (b) Determine the total settlement that will result from lowering the water table. Stiff clay, Yt = 120 pcf Cr. = 0.029, Co. = 0.178, o, = 1650 psf 12 20 Soft clay, Y = 118 pcf Cre = 0.034, C = 0.185 %3D 44 Depth (ft)

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