9. From the figure shown: (See picture below)Cross-sectional area = 0.6m2Hydraulic Conductivity of sand = 0.1 cm/secWhat is the rate of upward seepage of water? (Answer: 360 cm3/sec)What would be the critical hydraulic gradient? (Answer: 1.12 m)What value of h to cause boiling? (Answer: 2.8 m) heaves or when its effective stress isbefore the bottom of the saturated clayclay.How deep can the excavation proceedheaves or when its effective stress iszero.Problem:From the figure shown:h=1.5m1.5mG-2:68é = 0.5.2.5mSandvalveopenIn flow

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Answered: heaves or when its effective stress is…

heaves or when its effective stress is before the bottom of the saturated clay clay. How deep can the excavation proceed zero. Problem: From the figure shown: h=1.5m 1.5m G-2:68

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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QUESTION 12 1. A 40 cm well completely penetrates an unconfined aquifer of saturated depth 40 m. After a long period of pumping at a steady rate of 0.025 m³/s, the drawdown in two observation wells 20 m and 80 m from the pumping well were found to be 4.0 m and 2.0 m respectively. Determine the hydraulic conductivity of the aquifer. Round off to two (2) decimal places, Fill in the blank_ x 105 m/s
1. (30 pts) The soil profile shown below consists of 10 meters of sandy silt overlying gravel. The pore water pressure at the top surface of the silty sand is zero and can be assumed to remain zero. a) Calculate the level to which water would rise in a piezometer tube inserted into the top of the gravel if the silty sand is just stable? Use submerged unit weights and seepage forces to arrive at your answer (do not calculate total stresses and pore water pressures). Express your answer as an elevation, e.g. "Elev. 130". (Note: Elevations are in meters) (10 pts) b) Using the piezometric elevation calculated in part (a), calculate the pore water pressure at the bottom of the silty sand if the silty sand is just stable (10 pts). c) Calculate the total stress at the base of the silty sand and show that it is equal to the pore water pressure calculated in part (b) (10 pts) Elev. 120 m. Elev. 110 m. Sandy Silt (saturated) Void ratio, e = 0.68 G = 2.65 Gravel
2. An aquifer has a hydraulic conductivity of 180 ft/day, and effective porosity of 33% and is under a hydraulic gradient of 0.0004. a) Compute the Darcy velocity (also called Darcy flux). b) Compute the actual velocity (also known as the average linear velocity). c) The water temperature was 14 Degree C, and the mean pore diameter was 0.30 mm. d) Was it permissible to use Darcy's law under these circumstances? e) What is the reason for your answer?
Three piezometers have been installed in the confined aquifer shown in Figure 2 below. The aquifer has a uniform thickness of 3.5 m and a hydraulic conductivity of 2x10-1 cm/s. Determine the hydraulic gradient, the direction of flow, the transmissivity, and the flow rate per unit width of the aquifer.
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Question 13 Which of the following best decreases the hydraulic radius? O increasing the depth decreasing the depth O increasing the width O decreasing the width
Find out the change in length in a rock mass. while the strain recorded is 3% and the original length of that mass is 4 cm. Q:5 b) How the property of permeability generates in soil and find out the hydraulic conductivity of a rock when change in height is 6 cm and the original height of the sample is 8 cm. the volume recorded in outlet is 20cm^3 in 20 min. the diameter of intact saturated rock mass is 5 cm. *
From the figure shown, an unconfined non homogenous aquifer between two water bodies at a depth of t1 = 96 m and t2 = 75 m respectively. Take K1 = 36 m/s, K2 = 48 m/s, H1 = 1470 m and H2 = 1230 m. K, K2 t2 H1 H2 a. Compute the average coefficient of permeability of the aquifer in m/s. (2 DECIMAL PLACES) b. Compute the rate of flow in m^3/s. (2 DECIMAL PLACES) c. Compute the time in seconds required for the water to pass through the soil if it has a void ratio of 0.36. (2 DECIMAL PLACES)
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A falling head hydraulic conductivity test is performed on a sample of soil. The standpipe having a diameter 0.2 cm is observed and it takes 60 seconds for the water to drop by 50 cm from an initial hydraulic head of 90 cm. The sample has a length of 20 cm, and a diameter of 4 cm. Solve for the hydraulic gradient. O 1.75 O 1.25 O 2.5 O 1.5