Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 11, Problem 11.7P
To determine
Find the degree of consolidation caused by sand drain.
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Repeat Problem 16.6 with the following:D50 = 3.2 mmD20 = 0.91 mmD10 = 0.72 mm
4. With two cases shown in the following figure:
Plot pore pressure with depth for the soils if hydraulic conductivity of soils K1 = 5 x K2.
a-
b-
flow through a unit thickness of the cross-section if K1 = 5 x 10$ (f/s) and K2 = 1 x 10$ (f/s).
Estimate the rate of seepage (q) per linear foot of cross-section, i.e. calculate the rate of
C-
Plot flow net for 2 cases.
-z (ft)
z (ft)
Water
Water
3 ft
3 ft
Soil 1
1.5 ft
Soll 1
Sol 2
3 ft
3 ft
3 ft
1.5 ft
Soil 2
Datum
psf
Datum
psf
porous stone
porous stone
3 ft
1.5 ft
1.5 ft
Case 1
Case 2
5. The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/sec. Estimate the coefficient of permeability at a void ratio of 0.48.
Using Casagandre equation
Using Kozeny-Carman equation
Find the difference in the rate of flow using the results of “a” and “b” if i = 0.70 and A = 0.6 m2.
Chapter 11 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Please help me answer d and e.arrow_forwardShow solution. The answer must be 8.22 x10^-10 ft/secarrow_forwardGiven the figure below and considering a downward flow, forthe sand the following are its properties e=0.52 and Gs = 2.67, h= 0.650 and H1 = 1.20 m; H2 = 3.50 m,z = 1.50 m. a) Calculate and illustrate through a diagram the 6,u and 6' of the points C& B. Place your Calculated Values here: Inflow Point 6 6' (歲)。 Valve (open) B Outflowarrow_forward
- A bed of uniform sand having particle size 0.6 mm and specific gravity as 2.68 has porosity 0.42. Depth of the bed is 70 cm which is to be washed hydraulically. What is the backwashing rate if expansion of the bed is 40%. (Assume Stoke's law is valid and v = 1.3 x 10-2 cm?/sec)arrow_forwardHand written and clean witing pleasearrow_forwardThe section through a long cofferdam is shown below, the coefficient of permeability of the soil being 6x10-8 m/s. Determine the quantity of seepage entering the cofferdam. 5.50 m I 0 1 2 3 4 5 As = 0.70 ml +cl 10 B ax 15 marrow_forward
- شملarrow_forward8. Plot the consolidation curve for the data given below and determine the preconsolidation stress (o'c). Note: tsf = tons per square foot. tsf e 0.25 0.93 0.5 0.92 0.9 2 0.88 4 0.84 1 8 0.75 16 0.59 32 0.38 4 0.43 1 0.48 9. For the plot in problem 8, determine Cr and Cc.arrow_forwardFor the figure shown below, if the area of the tank is 0.5 m² and hydraulic conductivity of sand is 0.1 cm/sec. a. What is the magnitude and direction of the rate of seepage? b. If the value of h=1.2m, will boiling occur? Why? c. What should be the value of "h" to cause boiling? Outflow Inflow 1m 2m A B h = 1.2m e = 0.55 G=2.68 Valve (open)arrow_forward
- 2. Estimate the hydraulic conductivity (in cm/sec) of a poorly graded sand with the following characteristics: d100 = 0.425mm, d50= 0.3mm, d30 = 0.25mm, d10= 0.2mm, and do = 0.1mm. Show your work and circle your answer.arrow_forwardFor a sandy soil, the following are given: • Maximum void ratio = 0.72 • Minimum void ratio = 0.46 • Hydraulic conductivity at a relative density of 80% = 0.006 cm/sec. Determine the hydraulic conductivity of the sand at a relative density of 67%.arrow_forwardPlot the following data and determine the preconsolidation pressure and the modified compression index. % Consolidation (Compression is +) Pressure (kPa) % Consolidation (Compression is +) Pressure (kPa) 0.09 5 7.34 160 0.11 10 7.6 320 0.12 20 8.35 640 0.26 40 12.65 1280 0.98 80 17.41 2560 1.91 160 22.18 5120 4.19 320 21.65 1280 8.05 640 20.63 160 8.03 320 19.26 40 7.83 160 15.35 5 7.21 80 Specimen height is 2.54MM, Sample is from a depth of -11.5marrow_forward
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