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 8.8P
To determine
Find the seepage rate q, in
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.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.
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
An 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
H₁
Chapter 8 Solutions
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- 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_forwardAn earth dam is shown in the figure below. Determine the seepage rate. Given: a, = 46 degrees, az = 30 degrees, L1 = 10 m, H = 6 m, H, = 13 m, and k = 0.0031 cm/s. Use Schaffernak's method. Water level k Impervious base Round your final answer to three significant figures. Select the correct response: O 1.19 m/day/m 2.73 m/day/m 1.91 m3/day/m O 3.27 m3/day/marrow_forwardAn earth dam is shown in (Figure 1). Determine the seepage rate, q, in m/day/m Length using Schaffernak's method. Given: a, = 35 , a, = 40 , L, = 5m , H = 7m , H1 = 10m, and k = 3 × 10-4 cm/sec. + Li Water level H1 H Impervious basearrow_forward
- 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_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_forwardAn earth dam is shown in Figure, Determine the seepage rate, q, in m3/day/m length. Given: α1 =α2 =45o , L1=15m ,H=30m, H1=40m, K=4.2 ×10-4m/minarrow_forward
- 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.arrow_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_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
- 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 ?arrow_forwardOTO 1 × 1. For the flow net shown below, if the coefficient of permeability of the soil below the dam is (5.3x10-5 cm/sec) and ysat 17.7 KN/m³, find the following: (a)- The rate of seepage (m³/sec/m). (b)- The uplift force underneath the dam. (c)- The driving head at point M. (d)- The effective stress at points L and N. (e)- If the weight of the dam is 120 KN/m2, calculate the effective stress at point O. [Hint: Assume the weight of the dam is constant with depth] 희 0 mum < i-i ||| مزر للأعلى لاستعراض الفلاتر م إضافة شرح..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_forward
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