PROBLEM 1:A sample of sand, 5 cm in diameterand 15 cm long, was prepared at aporosity of 60% in a constant-headapparatus. The total head was keptconstant at 30 cm and the amount ofwater collected in 5 seconds was 40cm?. The test temperature was 20°C.theCalculatecoefficientofpermeability?a. 0.261 cm/s b. 0.960 cm/sc. 0.204 cm/s d. 0.178 cm/s

Diameter = d = 5cm Length = L = 15cm ∆H = 30cm V = 40cm3 t = 5sec

Answered: A sample of sand, 5 cm in diameter and…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter9: In Situ Stresses

Section: Chapter Questions

Problem 9.11P

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The results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5):• Constant-head difference = 550 mm• Water collected in 7 min = 450 cm3• Void ratio of sand = 0.8Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocity
Situation 2 - For a constant laboratory permeability test on a fine sand, the following data are given:Length of specimen = 16 cmDiameter of specimen = 96 mmConstant Head Difference = 50 cmVolume of water collected in 4 min = 420 ccVoid ratio of the soil specimen = 0.55Determine the seepage velocity in m/min. Round off to four decimal places.
For 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 velocity
In a constant head test, the sample of sand was collected 150 cm3 of water in just two minutes. The diameter is 5.08 centimeters, the length was 10 centimeters, and the head was maintained at 20 cm. 1) Determine the coefficient of permeability (Ans. 3.08 x 10-2 cm/s) 2) Determine the kind of soil (Ans. Coarse Sand) 3) Determine the interstitial velocity if n=0.3 (Ans. 0.21 cm/s)
Water flows at the rate of 0.09 ml/s in an upward direction through a sand sample with a coefficient of permeability of 2.7 × 10^–2 mm/s. The thickness of the sample is 120mm and the area of cross-section is 5400 mm2. Taking the saturated unit weight of the sand as 18.9 kN/m3, determine the effective pressure in Pa at the middle of the sample. a. 364 b. 910 c. 182 d. 728
The following data are for a falling-head permeability test:• Length of the soil sample = 150 mm• Area of soil sample = 1964 mm^2• Area of the standpipe = 25 mm^2• At time t = 0, head difference = 400 mm• At time t = 8 min, head difference = 200 mma. Determine the hydraulic conductivity of the soil (cm/sec). (ans. 2.75x10^-4 cm/s)b. What was the head difference at t = 6 min? (ans. 23.82cm)
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