PRIN.OF GEOTECHNICAL...-MINDTAP(2 SEM)
9th Edition
ISBN: 9781305971271
Author: Das
Publisher: CENGAGE L
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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
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?
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- An 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_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_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_forward
- 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 clayarrow_forwardRefer 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_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_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
- Given the discharge Q in Question#5, transmissibility T in Question#6, slope S in Question#4; find the aquifer width X. Question 4: A well with a storage coefficient of 0.05 m/s has a slope define by rise = 3 and run = 4. Find the velocity of flow using Darcy’s equation. Question 5: The soil porosity in the area where the 46-cm diameter well in Question#4 is 48%, find the discharge of the groundwater. Question 6: Given the coefficient k in Question#4 and porosity p in Question#5, find the transmissibility (T) in m/s per unit m, if the aquifer width is 1.2 m.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^3 / min / m) using L. Casagrande’s methodarrow_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
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