Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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- A constant head test is performed using a permeameter in the laboratory. The graduated cylinder collects 892 cm3 of water in 112 seconds. The soil specimen diameter = 18 cm , th elevation of water in upper-most piezometer is 181 com , the elevation of water in lowest piezometer is 116.6 cm and the piezometer inlets are evenly spaced at 16.7 cm on center. Compute the hydraulic conductivity, k and choose the correct answer below based on that. O A. 2.1 x 10^-3 cm/second O B. 1.5 x 10^-2 cm/second O C. 2.91 x 10^-2 cm/second O D. 2 x 10^-2 cm/second QUESTION 10 Given: -Applied stress on a soil = 122 kPa %3D -Influence Factor = 0.4 Compute the change in stress at 10 m below the edge of 25 m dimeter oil tank and select the correct answer from below: O A. Change in stress = 44 kPa O B. Change in stress = 49 kPa O C. Change in stress = 40 kPa O D. Change in stress = 42 kPa %3Darrow_forwardA falling-head permeameter contains a sample of length 10 centimeters and diameter 4 centimeters. The falling-head tube has an inside diameter of 1 centimeter. The head falls from 5 to 2 centimeters over a period of 70 minutes. What is the hydraulic conductivity in cm/sec? b. The water temperature was 21° C. At this temperature the density of water is 0.997 g/cm' and the viscosity is 0.00988 g/sec-cm. What is the intrinsic permea- bility of the sample? а.arrow_forwardProblem 7.11arrow_forward
- A confined aquifer has a thickness of 30m (m) and is fully penetrated by well where the aquifer is pumped at the rate of 500 litres per second. The groundwater thickness (H₁) is 50 m. The drawdown measured in two observation wells located at distance of 10 m and 100 m from the well are 7.5 m and 0.5m respectively. Determine the average hydraulic conductivity of the aquifer. At what distance from the well the drawdown is insignificant i.e. is zero (R).arrow_forwardplease answer part aarrow_forwardExample 3 q=3m³/s/m { calculate the following parameters for the bed level raise. = 2m y₁ = Y₂ = ? AZ = 0.2m a) determine the specific energy at section 2 (E₂) b) determine the downstream depth, (Y₂) e) interpret the results in £₁ = E₂ + 4E c) determine the absolute change in the water surface level (d) determine the downstream. Frade number (Fr₂) the context of E-y (Ay) ут= Угт ду curve.arrow_forward
- When soil water potential in a sandy loam soil goes from -0.1 to -10 bars, the height of an equivalent column of capillary water increases 100 times. The rate of water movement (the hydraulic conductivity): O increases by a factor of about 100 times increases by a factor of about 10 times remains little affected O decreases by a factor of about 1000 times decreases by a factor of about 10 timesarrow_forward2arrow_forward← Darcy' Law A sand sample of 35 m² cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 km, the discharge was 120 ml in 6 min. The dry unit weight of sand used for the test was 1120 g. and GS = 2.68 Take Sw = 1 g/ cm³ The hydraulic conductivity (in cm/sec) is × 10-³ Xarrow_forward
- Calculate the effective hydraulic conductivity for flow parallel and perpendicular to layering. Please show and explain the difference in values.arrow_forwardA clay sample is 2.5 cm high and has a diameter of 6.5 cm. It is placed in an oedometer with a variable- head permeameter. The water percolation through the sample is measured in a standpipe whose inner diameter is 1.7 mm. The tube is graduated in centimeters from the top to the bottom. The top graduation is zero and is located 35 cm above the base of the oedometer. The overflow in the oedometer is 3 cmabove its base. At the start of the test, the water level in the tube is at zero; 6 mins and 35 sees later, the water level has dropped to graduation 2. What is the coefficient of permeability of the clay in cm/s?arrow_forwardGiven: Permeability, k = 40 x 104 cm/s Saturated unit weight of the soil = 20 kN/m³ Other information shown in the Figure E3-3 Determine the following: (a) Quantity of Discharge (b) Total vertical stress at Points B and D (c) Pore-water pressure at Points B and D (d) Effective vertical stress at points B and D 20.0 m 6.5 m 5.0 m 10.5 m Water YAY Concrete Impervious Figure E3-3 1.0 m VAYAYAY 5.0 marrow_forward
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