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 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 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 Method
The value of x is 8
Chapter 8 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- A concrete dam and the flow net are shown in the Figure below. The following parameter are-5 3 given as: Nd=12, Nf=3.8, k=2.6X10 m/sec, and Ɣsat=19.5 kN/m .a) Calculate the total quantity of water lost by seepage in m3/day.b) What is the water quantity for each flow channel?c) What is the reading of pizometer if its location 1.5 m above datum?d) What is the factor of safety against piping at the down stream?arrow_forwardTake 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 ?arrow_forwardDetermine the total seepage loss per meter length of the dam (in mº/day/m). Given X = 18 m; Y = 4 m; Z = 11 m; D = 27 m and k (hydraulic conductivity) = 0.000027 m/s %3D Provide answers to ONE decimal. Show work in hand calculation sheet. Y D A.arrow_forward
- 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.arrow_forwardPlease solve step by step and explain how you got your answersarrow_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_forward
- Example 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_forwardA weir installed at the end of a rectangular channel controls the flow of water. The rate of flow is 0.62 m^3/s. If the error in measuring the head is 0.018m, determine the percentage error in the measured flow if the weir is a suppressed rectangular with L = 4.5m. A) 16.98% B 15.58% (c) 12.21% (D) 14.32%arrow_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_forward
- Correct answer please.arrow_forwardQ3 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_forward12 Determine the quantity of seepage under the dam cross section shown in m3/s/m if the soil has hydraulic conductivity, k=0.0001 meter cube per second. Note the numbers in the figure from left to right are:2.0m, 1.8m, 2.4m and 8.0 m, respectively. 2.00m 8.00 m 1.80 m Datum 12.40m 777 Enter your answerarrow_forward
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