Bundle: Principles Of Geotechnical Engineering, Loose-leaf Version, 9th + Mindtap Engineering, 2 Terms (12 Months) Printed Access Card
9th Edition
ISBN: 9781337583817
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 8, Problem 8.11P
To determine
Find the seepage rate through the dam q, in
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8.12 An earth dam section is shown in Figure 8.28. Determine the rate of seepage
through the carth dam using Pavlovsky's solution. Use k- 4x 10 mm/s.
Critical Thinking Problem
8.C.I Refer to Problem 8.12. Given Ak = 4x 10 m/min and k =1X 10 m/min.
Take note: Answer and write your solution on a clean paper clearly.
During a flood flow the depth of water in a 12 m wide rectangular channel was found to be 3.5 m and 3.3 m at two sections 300 m apart. The drop in the water-surface elevation was found to be 0.18 m. Assuming Manning’s coefficient to be 0.023, determine the following:
a. Average value of k?
b. Estimate the flood discharge through the channel ?
Q.1. The figure below shows the flow net for seepage under a concrete dam. The is silty sand
with coefficient of permeability of 4X104 cm/sec, a void ratio of 0.6 and specific gravity of 2.7.
The height of water upstream is H=( 6+)
(a) Determine the flow rate under the dam in m/day per m length of the dam.
(b) Determine the water pressure distribution at the base of the dam. (Select 3 points under the
base. Comment on your results.
m (where X is your group number).
(c) From (b), calculate the resultant uplift force and its location from the upstream face of the
dam. Also, calculate the weight of the dam to prevent uplift using a factor of safety of 5.
(d) What is the factor of safety against piping? Is the dam safe?
(e) Calculate the total vertical overburden stress, pore water pressure and the effective vertical
overburden stress at Points A and B. Comment on your results.
H
17.5 m
1.25 m
x B
4 m
Impervious clay
Chapter 8 Solutions
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- An earth dam is shown in the figure below. Determine the seepage rate. Given: a1=48 degrees, a2= 30 degrees, L1=6m, H 17m, H1=21m and k=0.007 cm/s. Use L.Casagrande Methodarrow_forwardRefer to the cross section of the earth dam shown below. Calculate the rate of seepage through the dam (q in m/min/m) using Schaffernak's and Casagrande's solutions. +7 m→| 3 m G.W.T. 1 32 m 2.0 2.0 Impermeable layerarrow_forwardRefer to the cross section of the earth dam shown in the figure. Calculate the rate of seepage through the dam (q in m^3 / min / m) using L. Casagrande’s methodarrow_forward
- Refer to the cross section of the earth dam shown in the figure. Calculate the rate of seepage through the dam (q in m3/ min / m) using L. Casagrande's method. K 5 m 1V: 2H 30 m 1V: 2H 25 m k = 3 x 10-4 m/min Impermeable layer Select the correct response: 5.91 x 103 m/min/m 2.37 x 103 m3/min/m 11.4x 104 m/min/m 29.5 x 104 m3/min/marrow_forward.An earth dam is shown in Fig 4 . Determine the seepage rate, q, in m3/day/m length. Given: α1 =350, α2 = 400, L1 = 5 m, H =7 m, H1 =10 m, and k =3 x 10 -4 cm/sec. Use Schaffernak’s solution.arrow_forwardRefer to the cross section of the earth dam shown in the figure. Calculate the rate of seepage through the dam (q in m/ min /m) using L. Casagrande's method. +5 m 1V: 2H 30 m 1V: 2H 25 m k = 3 X 104 m/min Impermeable layer Round your final answer to three significant figures. q = ×10-4 m³/ min /marrow_forward
- 6. The sludge hopper of a sedimentation tank is approximated as a truncated square prism provided with an orifice of 100 mm dia. at its bottom as shown in the figure. The sludge is being discharged through the orifice Determine the time taken for emptying the hopper. Assume Cd=0.62. 2m 1m E im -arrow_forwardAn earth dam is shown in (Figure 1). Determine the seepage rate, q, in m³/day/m Length using Schaffernak's method. Given: a₁ cm/sec. 35, a₁ = 40, L₁= 5m, H = 7m, H₁ = 10m, and k = 3 × 10-4 +44 Water level = Impervious base H₁arrow_forwardExample 2: A soil sample with 10 cm in diameter is placed in a tube 1 m long. A constant supply of water is allowed to flow into one end of the soil at A and flow out at B is collected by beaker. The average amount of water collected is 1 cm3 for every 10 seconds. The tube is inclined as shown in the figure. Determine: a. Hydraulic gradient b. Flow rate lisiya im University of Al- c. Average velocity d. Seepage velocity if e = 0.6 Of e Engine I m e. The hydraulic conductivity Soil 1 m 0.8 marrow_forward
- A falling head hydraulic conductivity test is performed on a sample of soil. The standpipe. having a diameter 0.35 cm is observed and it takes 80 seconds for the water to drop by 70 cm from an initial hydraulic head of 90 cm. The sample has a length of 22 cm, and a diameter of 5 cm. Compute the rate of flow of water in the soil (in cm³/s). Answer in 3 decimals Pls answer asaparrow_forwardNf : 5 Nd=16 25 m Question 4 Seepage take place beneath a concrete dam as shown in Figure 2. The soil beneath the dam is a fine silty sand with hydraulic conductivity of 4.2 x 10“cm/s and saturated unit weight of 19.5 kN/m³. 6 m 1.75 m: 1) Find the rate of seepage beneath the dam in m³/day/m 2) If a standpipe piezometer is installed at the tip of the sheet pile, how high will the water rise? Impervious stratumarrow_forwardAn earth dam is shown in the figure below Determine the seepage rate, q, in m^3/day/m length. Given: α1=35°, α2=40°, L1=5 m, H=7 m, H1=10 m, and k= 3x10^4 cm/sec.arrow_forward
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