Question: A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in Figure 1. Given that k = 5 + 10-5 mm/sec Ya = 20 kN/m³ w = 21% n = 20% Determine, a) How high [m] the water will rise if piezometer is placed at point B (above point B). b) The total rate of seepage [m³/s/m] through the permeable layer per unit length. c) Magnitudes of effective vertical stress [kN/m²] at A and B. Sheet piling 4.00 m 8.00 m Im \11.00 m F 6.00 m 8.00 m (Datum Figure 1

Question: A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in Figure 1. Given that k = 5 + 10-5 mm/sec Ya = 20 kN/m³ w = 21% n = 20% Determine, a) How high [m] the water will rise if piezometer is placed at point B (above point B). b) The total rate of seepage [m³/s/m] through the permeable layer per unit length. c) Magnitudes of effective vertical stress [kN/m²] at A and B. Sheet piling 4.00 m 8.00 m Im \11.00 m F 6.00 m 8.00 m (Datum Figure 1

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.5P

See similar textbooks

Similar questions

Example 3: A flow net for flow around a single row of sheet piles in a permeable soil layer is shown below Given that K = = Ky = K = 5 x 10-3 cm/sec, determine 1. How high (above the ground surface) the water will rise if piezometers are placed at points a and b. 2. The total rate of seepage through the permeable layer per unit length. 3. The approximate average hydraulic gradient at Water level Ground surface Scale 5m 5.6 m P ► 2.2 m Water table Flow channel 1 Flow channel 2 = 1 1 b Flow channel 3 <= 1 Impervious layer 1 0.38
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 8.2 A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in Figure 8.7. Given that k, = k = k = 5 x 10-³ cm/s, determine a. How high (above the ground surface) the water will rise if piezometers are placed at points a and b b. The total rate of seepage through the permeable layer per unit length c. The approximate average hydraulic gradient at c Water level Ground surface Scale 5 m 5.6 m 2.2 m Water table Flow channel 1 Flow channel 2 Flow channel 3 Impervious layer FIGURE 8.7 Flow net for seepage around a single row of sheet piles b 1/ b = 1 = 1 1 1 T 0.38
Example 3: A flow net for flow around a single row of sheet piles in a permeable soil layer is shown below Given that K, = K, =K = 5 x 10-3 cm/sec, determine 1. How high (above the ground surface) the water will rise if piezometers are placed at points a and b. 2. The total rate of seepage through the permeable layer per unit length. 3. The approximate average hydraulic gradient at Water level 5.6 m Water table 2.2 m Ground surface Flow channel I Flow channel 2 Flow channel 3 b. 0.38 Scale 5 m Impervious layer
A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in Figure. Given that kx = kz = k = 5x10-3 cm/sec, determine: a) How high (above the ground surface) the water will rise if piezometers are placed at points a and b. %3D b) The rate of seepage through the permeable layer per unit length. c) The approximate average hydraulic gradient at c. Water level 5.6 m Water table 2.2 m Ground surface How channel 1 Flow channel 2 = 1 1 a How channel 3 0.38 Scale 5 m Impervious layer 1. - 01
Question 8 Find the flow rate in m'/sec/m length (at right angles to the cross section shown) through the permeable soil layer shown in Figure Q8 given H=8 m, H1=3 m, h-4 m, L=50 m, a-8°, k-0.08 cm/sec. Direction ఆf tow O Empervious layer Permeable layer Figure Q8. Name / ID number: Answer:
A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in Figure below with a scale as shown. Given that kx = kz=k = 4 x 10-3 cm/sec, determine How high (above the ground surface) the water will rise if piezometers are placed at points a and b The total rate of seepage through the permeable layer per unit length The approximate average hydraulic gradient at c factor of safety against piping x=1.6 y=2.8
A concrete dam retains water to a height of 9 m. It has rows of sheet piling at both heeland toe which extend half way down to an impervious stratum. From a flow net sketchedon a transformed section, it is found that there are four flow channels and sixteen headdrops. The average horizontal and vertical permeabilities of the soil are 6 × 10^–3 mm/sand 2 × 10^–3 mm/s, respectively. What is the seepage in cubic meter per day, if the lengthof the dam is 150 meters?
Soil sample and flow condition are shown in the following figure: Inflow C 2m Outflow Soil ↑ B A Ysat of sand = 20 kN/m³, Yw= 20 kN/m³ (i) Find the head, h required to cause quick condition. h 2m 10m Compute the seepage force per unit volume at quick condition. Use cross-section area of tube as 1 m². (iii) A student accidentally broke the left hand riser tube to the point C at an elevation 2 m above point A. Assuming that the water level is now maintained at C, compute the new hydraulic gradient, effective stress at elevation A and seepage force at elevation A.
Q: The dam and flow nets shown in Figure below. The dam has two 10 m sheet piles driven partially into the granular soil layer. Datum is at the bottom impervious level. Determine (i) the quantity of seepage loss under the dam in m³/s/m (assume k-2 x 10³ cm/s), (ii) the exit gradient at point X (provide your answer in two decimal points), (iii) the uplift pressure at point C and (iv) the factor of safety with respect to piping. 30 m Impervious: 10m 2m 10m sheet pild Ⓒ 40 m C 0.4 2m E 10 m sheet pile X 8.5 m Scale: 0 Number of equipotential drops 10.4 Datum 10 m
A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in the following figure. The water level rose to 5.4 m above the ground surface in the peizometer installed at point a. Given that ky= k = k= 4.5 x 103 cm/sec, determine i) Depth of upstream water level, H1 ii) How high (above the ground surface) the water will rise if piezometers are placed at points b and c iii) The total rate of seepage through the permeable layer per unit length iv) The approximate average hydraulic gradient at c Water level ↑ H H1 Water table 1.9 Ground surface Flow channel 1 = 1 Flow channel 2 = 1 b 1 а Flow channel 0.38 Scale 5 m Impervious layer
FLOW NETS PROBLEM 4: The depth of water outside the cofferdam as shown in the figure is 10 ft. and the penetration of the sheetfiles below the original surface of the sand is 18 ft. The water level in the ditch is 20 ft below the outside water level. If k = 5 x 10-3 cm/sec., what will be the seepage into the ditch per foot length of the entire cofferdam? a. 0.256 ft/sec b. 0.0028 ft/sec C. 0.0388 ft/sec d. 2.88 ft/sec water surface wąter surface sheet piles 8 ft