Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Question
Chapter 2, Problem 2.11P
(a)
To determine
Find the hydraulic conductivity.
(b)
To determine
Find the hydraulic conductivity.
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For 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%.
From the figure shown, the void ratio of the sand is 0.55 with a specific gravity of 2.68. The cross-sectional area of the tank is 0.5 sq.m and hydraulic conductivity of sand = 0.1 cm/s.
a. What is the rate of upward seepage in cu.m/hour?
b.Determine the critical hydraulic gradient for zero effective stress.
c. Determine the value of h (head loss) to cause boiling.
NEED ASAP. THANK YOU.
The data from a falling-head test on a silty clay are:
Cross sectional area of soil = 1000 mm^2
Length of soil sample = 200 mm
Area of stand pipe = 40 mm^2
Head difference at time t = 0 is 500 mm
Head difference at time t = 3 min is 300 mm
a) Determine the hydraulic conductivity of the soil in cm/sec.
b) What is the head difference at time t = 100 sec in mm
Chapter 2 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 2.6PCh. 2 - Prob. 2.7PCh. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10P
Ch. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - For a normally consolidated soil, the following is...Ch. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27P
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- The hydraulic conductivity of a sand at a void ratio of 0.750 is 0.047 cm/s. Estimate the coefficient of permeability at a void ratio of 0.450 1. Using Casagrande equation 2. Using Kozeny-Carman equationarrow_forwardFor a constant head permeability test in a sand, the following values are given:• L 350 mm• A 125 cm2• h 420 mm• Water collected in 3 min 580 cm3• Void ratio of sand 0.61Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocityarrow_forwardat 0.45 porosity the hydraulic conductivity of the sand is 0.010 cm/sec what is the hydraulic conductivity at n equal to 0.50.arrow_forward
- For a falling-head permeability test, the following values are given: · Length of specimen = 250 mm. · Area of soil specimen = 1200 mm2. · Area of standpipe = 50 mm2. · Head difference at time t = 0 = 600 mm. · Head difference at time t = 200 sec = 300 mm. Determine the hydraulic conductivity of the soil in cm/sec.arrow_forward2. Situation 2 - For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen = 16 cm Diameter of specimen = 96 mm Constant Head Difference = 50 cm Volume of water collected in 4 min = 420 cc Void ratio of the soil specimen = 0.55 a. Determine the hydraulic conductivity of the soil in m/min. Round off to four decimal places. b. Determine the discharge velocity in m/min. Round off to four decimal places. c. Determine the seepage velocity in m/min. Round off to four decimal places.arrow_forwardFor a constant head laboratory permeability test on fine sand, the following values are given: Length of specimen, L = 15inches Diameter of specimen, D = 3inches Head difference, h = 22inches Water collected in 120 seconds = 0.057cu.in Void ratio, e = 0.37 a. Determine the hydraulic conductivity (in/min) of the soil. b. Determine the discharge velocity (in/min) through the soil. c. Determine the seepage velocity (in/min) {νs=νn}. Note: Your answer must contain 5 numbers after the decimal point. (Example: 0.00504, 0.00899, 0.02345, 0.00200) these values must be used to solve succeeding questions. Please answer this asap. For upvote. Thank you very mucharrow_forward
- For a decreasing load permeability test, the following are given values: - Sample length: 200 mm - Soil sample area: 1000 mm² - Piezometer area: 40 mm² - Load difference at instant t = 0: 500 mm - Load difference at instant t = 180 s: 300 mm Determine the hydraulic conductivity of the soil in cm/s.arrow_forwardFor a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the hydraulic conductivity of the clay for the loading range in m/min. Show diagramarrow_forwardFor a falling head permeability test, these valueare given: Length of the soil specimen = 200 mm Area of the soil specimen = 1000 mm2 Area of the standpipe = 40 mm2 Head difference at time, t = 0 min is 500 mm Head difference at time, t = 3 min is 300 mm1. Determine the hydraulic conductivity of thesoil in cm/sec.2. What was the head difference at time, t =100 sec?arrow_forward
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