Answered: 4. For a variable head permeability…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.23P

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Transcribed Image Text:4. For a variable head permeability test, the following are given: 2. A borehole at a site reveals the soil profile shown. Assume Gs = 2.70 for all soil types. Length of soil specimen 200 mm Area of soil specimen a. What is the unit weight of the soil in layer 1 in kN/m³? 1000 mm? Area of standpipe b. What is the effective stress at a depth of 2m below the ground surface, in kPa? 40 mm? Head difference at time t = 0 c. What is the effective stress at a depth of 20.6m below the ground surface, in kPa? 500 mm Head difference at time t = 3 min 300 mm Elevation (m) Continuous supply Very fine wet sand with silt w = 5%, S = 40% Layer 1 2.0 Fine sand saturated by capillary action Layer 2 3.0 500 mm - Fine sand, w = 12% Layer 3 5.4 300 mm -Area of stand pipe. = 40 mm2 L=200 mm icimple -Porous plate Soft blue clay, w = 28% Layer 4 Area of soil sámple = 1000 mm? a. Compute the hydraulic conductivity of the soil in cm/sec. b. Compute the seepage velocity if the porosity of soil is 0.25. 20.6 c. What was the head difference at time, t = 100 sec.

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