Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
Chapter 7, Problem 7.4P
To determine
Draw the flow net.
Find the seepage loss per meter length of the sheet pile.
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A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in the Figure below. Given that kx= kz = k= 5.5 x 10-3 cm/sec, H1 = 6.5 m and H2 = 2.3 m determine:
i. How high (above the ground surface) the water will rise if piezometers are placed at points a and b
ii. The total rate of seepage through the permeable layer per unit length
iii. The approximate average hydraulic gradient at c
Example
A flow net for flow around single row of
sheet piles in a permeable soil layer is
shown
in
the
figure.
Given
Sheet pile
kx = k = k = 5xl10-3
cm/sec.
Determine:
1. How high (above the ground 0
surface) the water will rise if
piezometers are placed at
points a, b, c, and d.
2. The total rate of seepage
II
II
-4.5
Nr= 3
through the permeable layer
per unit width.
3. The rate of seepage through
the flow channel II per unit
width (perpendicular to the
section shown)
-9.0
Datum
Imnermeahle laver
Given h = 30 m, D= 40 m and the soil beneath the dam has a hydraulic conductivity of
3x10-3 cm/s. Compute 1) pore pressure at point b, and 2) the flow rate under the sheet
pile.
given = h = 30m
NF
No
D=40m
*units meters
0.8h
h 30
640
0.7h
Sheet pile
D12-c
0.6h 0.5h 0.4h
0.2h
Chapter 7 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Given h = 30 m, D= 40 m and the soil beneath the dam has a hydraulic conductivity of 3×103 cm/s. Compute 1) pore pressure at point b, and 2) the flow rate under the sheet pile. given = h = 30m D=40m NF No *units meters 0.8h h 30 640) 0.7h 0.6h 0.5h Sheet pile D12-c 7777 0.4h b 0.34 0.2harrow_forwardA flownet for flow around a single row of sheet piles in a permeable soil layer is shown in Figure 1 below. Given the hydraulic conductivity is 5 x 10-3 cm/sec. Determine:arrow_forwardThe dam and flow net shown in the attached picture. The dam is 120 m long and has two 10 m sheet piles driven partially into the granular soil layer. Datum is at tailwater elevation. Determine: 1. The quantity of seepage loss under the dam when k= 20*10^(-4) cm/s 12 m 10 m sheet pile 10m sheet pille 85m 30 m Impervious - O C 0.4 1 Scale: Number al equipotential dropsarrow_forward
- Q1#: For the concrete Dam shown in figure, determine the total average seepage for the given permeable strata by drawing Flow Net. The detail dimensions are given on the figure. The head of water on upstream side is 6ft and on downstream side is 1ft. Assume of Nf= 3, Nd= 6 and rectangular flow elements. Use paint or graph paper. SIR PLS, GIVE ME PROPER AND CORRECT ANSWER WITH FULL DETAILS AND ALSO USE PAINT OR GRAPH PAPER. THANKSarrow_forward5- 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_forwardThe answer on letter B. MUST BE "q = 0.401 cm3/s/cm" kindly explain your solution thank youarrow_forward
- Figure 18.26a shows a pile. Let L = 20 m, D = 450 mm. Hf = 4m, f = 17.5 kN/m3, fill = 25. Determine the total downward drag force on the pile. Assume that the fill is located above the water table and that = 0.5 fill. FIG. 18.26 Negative skin frictionarrow_forwardDetermine the following: 1. How high water will rise in piezometers at points a, b, c, d. 2. Total rate of seepagearrow_forwardThe weir shown below is 50 m long ● Draw a flow net for the flow under the weir Calculate the rate of seepage for the entire weir. Calculate the total uplift force acting on the weir base. Calculate the exit hydraulic gradient near the toe of the weir ● ● קק →★★ 10 m 24 m 37 m Sheet pile ==1.5 m 3 m 9 m k = 10-3 cm/sec Impermeable layerarrow_forward
- The 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 =Sm 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_forwardGiven the flow net in the figure below, having k=5×10−3cmsec. Determine the following a. How high water will rise in piezometers at points a, b, c, d. b. Rate of seepage through flow channel II. c. Total rate of seepage Please answer this asap. For upvote. Thank you very mucharrow_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_forward
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