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 8, Problem 8.15P
A sand has Gs = 2.66. Calculate the hydraulic gradient that will cause boiling for e = 0.35, 0.45, 0.55, 0.7, and 0.8.
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L = 370 mm
A = 145 cm^2
h = 340 mm
Water collected in 3 min Q = 580 cm^3
Void ratio of sand e= 0.66
Determine the Hydraulic conductivity and seepage velocity.
From the figure shown, H1 = 0.60, H2 = 0.90 m. and h = 0.45 m. The sad has a saturated unit weight of 18.65 kN/m3 . Hydraulic conductivity of sand K = 0.12 cm/sec. If the cross sectional area of tank = 0.46 m2 , determine the following:
1. Total stress and Effective stress at C.
2. Pore water pressure at C.
3. Rate of upward seepage of water in liters/sec.
At n = 0.45, the hydraulic conductivity of the sand is 0.010 cm/sec. Determine the hydraulic conductivity at n = 0.50.
Chapter 8 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 8 - Prob. 8.1PCh. 8 - Prob. 8.2PCh. 8 - Prob. 8.3PCh. 8 - Prob. 8.4PCh. 8 - Prob. 8.5PCh. 8 - Prob. 8.6PCh. 8 - Prob. 8.7PCh. 8 - Prob. 8.8PCh. 8 - Prob. 8.9PCh. 8 - The soil profile at a site consists of 10 m of...
Ch. 8 - Prob. 8.11PCh. 8 - Prob. 8.12PCh. 8 - Prob. 8.13PCh. 8 - Prob. 8.14PCh. 8 - A sand has Gs = 2.66. Calculate the hydraulic...Ch. 8 - Prob. 8.16PCh. 8 - A point load of 1000 kN is applied at the ground...Ch. 8 - Point loads of magnitude 9, 18, and 27 kN act at...Ch. 8 - Refer to Figure 8.13. The magnitude of the line...Ch. 8 - Refer to Figure 8.24. Determine the vertical...Ch. 8 - Consider a circularly loaded flexible area on the...Ch. 8 - A flexible circular footing of radius R carries a...Ch. 8 - The plan of a flexible rectangular loaded area is...Ch. 8 - Refer to Figure 8.26. The circular flexible area...Ch. 8 - Refer to Figure 8.27. The flexible area is...Ch. 8 - Prob. 8.26CTPCh. 8 - Prob. 8.27CTP
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- Consider two horizonal soil layers, each is isotropic, the upper layer 1 is sitting directly on the top of bottom layer 2. Layer 1 has a thickness of 2 m and a hydraulic conductivity of 0.26 m/day and layer 2 has a thickness of 4 m and a hydraulic conductivity of 0.95 m/day. In this case, calculate the equivalent horizontal hydraulic conductivity in m/day.arrow_forwardDetermine the horizontal and vertical equivalent hydraulic conductivity for the following stratified soil. Take depth of each layer equal to 1.25 m Layer Hydraulic Conductivity (cm/s) 1 0.003 2 0.0003 3 0.002 4 0.0004arrow_forwardRefer to the figure. If H1 = 1.94 m, H2 = 2.37 m, h = 1.c m, e =0.49, Gs = 2.67,area of the tank = 0.64 m2, and hydraulic conductivity of the sand (k) = 0.3d cm/sec. What is the upward seepage force per unit volume of soil?arrow_forward
- For the soil profile show in figure calculate the total vertical stress pure water pressure and effective vertical stress at depth of 0 m 1.2m 2.5m and 5m and 8m.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_forwardEstimate the lateral earth pressure at a depth 20 ft (6.1 m) below the ground surface in a loose sand deposit. The wet unit weight of the sand is 115 pcf (19 kN/m3). What would the total lateral pressure be if the water table rose to the ground surface (in psf or kPa)?arrow_forward
- Calculate the equivalent hydraulic conductivity in the horizontal as well as the vertical direction for the given stratified soil. Layer Hydraulic conductivity (cm/sec) 1 0.002 2 0.0002 3 0.001 4 0.0003 The depth of each layer is 1 m.arrow_forwardConsider a clay layer drained at the the top and bottom as shown in figure. For the case of constant initial excess pore water pressure (ui=u0) and Tv=0.4 ,determine the degree of consolidation Uz at z/Ht.For the solution, start from eq.(6.32).arrow_forwardAn impervious layer underlies 4 layers of permeable soil. The thickness and the coefficient of permeability each layer from top to bottom are: Evaluate the equivalent horizontal coefficient of permeability of the deposit in cm/sec. Evaluate the discharge of the aquifer in m3/day if the hydraulic gradient for the soil formation is 0.70.arrow_forward
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