MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 2 terms (12 months)
9th Edition
ISBN: 9781305971264
Author: Braja M. Das; Khaled Sobhan
Publisher: Cengage Learning US
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Chapter 8, Problem 8.1CTP
To determine
Find the seepage rate through the earth dam using Schaffernak’s solution.
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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.
An earth dam is shown in Figure 8.22. Determine the seepage rate, q, in m3/day/m length. Given: α1 = 35°, α2 = 40°, L1 = 5 m, H = 7 m, H1 = 10 m, and k3 = 10-4 cm/sec.
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Chapter 8 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 2 terms (12 months)
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- 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_forwardQ.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 clayarrow_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
- * The cross-section of an earth dam is shown in figure below. Assuming that the water level remains constant at 35m, determine the seepage loss through the dam. The width of the dam is 300m, and the soil is anisotropic with k=8.3*107 m/s and k, =3.2 10“ m/s. determine the seepage loss through the dam? 50m 35 m Filler Som 20m 20 m 30 m (a) The problem (bị Fiow netarrow_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_forwardplease solve situation 5arrow_forward
- Q3 Figure Q3 shows a flow net for flow through a weir, the base of which is 2m below the ground surface, in a permeable soil layer. Given that the coefficient of permeability =k = 5×10-³ cm/sec, determine the following: - 14 m 7 m 8 m 2 m 10 m kx = k, = k Impermeable laye Figure Q3 a) Total head (m) at point a, b, c, d, e, and f. b) Uplift pressure (or water pressure, kPa) at point a, b, c, d, e, and f. c) The total rate of seepage per unit length through the permeable layer. d) The approximate average hydraulic gradient at point f.arrow_forwardThe figure shown is a dewatering plan to build the foundations of an office building below the water table without the sheet-piling. Assume that all b = 6 meters and all 1 = 4 meters in all grids of the middle flow channel. Dewatering wells Marshy soils Ah =m Excavated site OL Ah = 2m Ah = 2m Ah = 2m Lowered WT a. What is the value of n? b. How many flow channels are in the figure? c. How many potential drops are in the figure? d. The potential drop at area 1 is: e. The potential drop at area 2 is: f. The potential drop at area 3 is: g. The average hydraulic gradient in each net is:arrow_forwardSolve 8.C.1arrow_forward
- 5- An earth dam is shown below. Determine the seepage rate, q, in ft/day/ft length. Given: a1=35°, az=40°, L1=5 ft, H=7 ft, Hj=10 ft, and 3X104 ft/sec. Water level k H1 H Impervious base 6- The Repeat Problem 5 using Casagrande's method.arrow_forwardurgent in 1 hourarrow_forwardQuestion attachedarrow_forward
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