Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 9, Problem 9.12P
(a)
To determine
Find the rate of upward seepage of water.
(b)
To determine
Find the effective stress
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Refer to Problem 8.4. Using the flow net drawn, calculate the hydraulic uplift force at the base of the hydraulic structure per meter length (measured along the axis of the structure).8.24 For the hydraulic structure shown in Figure 8.24, draw a flow net for flow through the permeable layer and calculate the seepage loss in m3/day/m.
11. A channel runs almost parallel to a river as shown in the figure. The water level in the river has an elevation of 36 m. and the elevation of the channel is 33 m. The river and channel are 600 m apart and a previous formation of the average thickness of 9 m and hydraulic conductivity of 0.80 m/hr joints them together.
Compute the hydraulic gradient
Compute the rate of seepage flow from the river to the channel per meter width in liters per day.
If the seepage velocity is 0.048 m/day, compute the void ratio of the previous medium.
9. From the figure shown: (See picture below)
Cross-sectional area = 0.6m2
Hydraulic Conductivity of sand = 0.1 cm/sec
What 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)
Chapter 9 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- 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.arrow_forwardGiven: velocity of flow = 0.0375 m/s coefficient =0.05 m/s porosity p =48% slope S = 3/4 Given the coefficient =0.05 m/s and porosity p =48%, find the transmissibility (T) in m/s per unit m, if the aquifer width is 1.2 m.arrow_forwardThe dam shown has a base of which 2m below the ground surface. The pressure distribution diagram at the base of the dam can be obtained from the equipotential lines as follows: k=4.5 m/day. if H=6m determine the seepage through the foundation.arrow_forward
- Use 10 kN/m3 for unit weight of water. For a concrete structure that retains water, a flow net is sketched as shown in Figure H8-3. Noting the marked location of the Datum, answer the following: Mark on the figure all boundary Also mark the type of each boundary. Calculate the uplift pressures at points A, B, C, D, E, and F. Calculate the factor of safety against The seepage loss (q) per day per meter length of the (i.e. q in m3/day/m) if the permeability of the soil is k = 10-4 m/sec.arrow_forwardGiven: velocity of flow = 0.0375 m/s coefficient =0.05 m/s porosity p =48% slope S = 3/4 The soil porosity in the area where the 46-cm diameter well is 48%, find the discharge of the groundwater. Given the coefficient =0.05 m/s and porosity p =48%, find the transmissibility (T) in m/s per unit m, if the aquifer width is 1.2 m. Given the discharge Q get in Question #1, transmissibility T in Question#2, slope S = 3/4; find the aquifer width X.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
- Given: velocity of flow = 0.0375 m/s coefficient =0.05 m/s porosity p =48% slope S = 3/4 The soil porosity in the area where the 46-cm diameter well is 48%, find the discharge of the groundwater. Given the discharge Q get in Question #1, transmissibility T in Question#2, slope S = 3/4; find the aquifer width X.arrow_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_forward35.) A dense silt layer has the following properties: void ratio = 0.75, specific gravity = 2.59. Free ground water is 9.49 m. below the ground. Capillary action rise will reach 6.69 meters. The soil above capilary action rise is dry while within the zone, it is saturated at 50.02%. Determine the effective pressure (in kPa) at a depth of 7.51 meters from the ground surface. Round off to three decimal places.arrow_forward
- Seepage around a retaining wall is shown in the figure below. The hydraulic conductivity of the sand is 1.8 x 10-5 cm/s. The retaining wall is 20 m long. Determine the quantity of seepage across the entire wall per dayarrow_forward29. Soil in a field has three layers. Each has a thickness of 3m, 4m, and 3m, from top layer to bottom layer. The hydraulic conductivity of each layer is 0.0043cm/s, 0.0072cm/s, and 0.0018cm/s, respectively. Calculate the effective horizontal hydraulic conductivity.arrow_forwardQuestion 32 A dense silt layer has the following properties: void ratio = 0.66, specific gravity = 2.5. Free ground water is 9.47 m. below the ground. Capillary action rise will reach 6.66 meters. The soil above capilary action rise is dry while within the zone, it is saturated at 52.77%. Determine the effective pressure (in kPa) at a depth of 7.42 meters from the ground surface. Round off to three decimal places.arrow_forward
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