7. The flow net for concrete dam situated on a soil cross section with an inclined base asshown. Compute the quantity if seepage per unit thickness through the cross section (inm³/day-m). Assume that k = 2 × 10ª cm/s.7.5 m

To calculate the quantity of seepage per unit thickness through the cross section of the dam, we can…

Answered: 7. The flow net for concrete dam…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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32 m 2.0 17 m 2.0 Impermeable layer Determine the rate of seepage through the earth dam (in m³/m/min) using Pavlovsky's solution. Use k = 4 x 10-5 mm/s. m³/m/min
B8
For the flow net shown below, the soil saturated unit weight is 20 kN/m³, water unit weight is 10 kN/m3, calculate: (k = 1.9 × 10-Sm/s, Hupstream=13.6294) %3D (3) Head difference (H)=? (1) (m) Nf=? (2) Nd=? if the datum at the ground surface, the total (4) head (ht)=? (m) the quantity of seepage under the dam=? (m³/s (5) per m) the pressure head (hp) at point A=? (m) (6) the pressure head (hp) at point B=? (m) (7) ?=the exit hydraulic gradient (ie) (8) ?=the factor of safety against the boiling (F.S) (9) 2m 20m 15m 0.9m 13m 13m 22m B Impermeable Rock
7 C.
The section of a cofferdam is as shown in the figure.
A circular tube of length 500 mm and cross-sectional area 50 cm2 is placed horizontally and filled with soil A of length 200 mm and soil B of length 300 mm. The head difference between the inlet and outlet of tube is 20 cm. The coefficient of permeabilities of soil A and soil B are 2 mm/s and 2.5 mm/s respectively. The discharge taking place through the soil A is cm3/s.
The dam shown has a base of which 2m below the ground surface. The pressure distribution diagram at the base of the dam can be obtained from the equipotential lines as follows: k=4.5 m/day. if H=6m determine the seepage through the foundation.
E Problem 3. Given the following set up, where the reservoir levels are maintained at a constant levation: Find the total head for points A and B Find the hydraulic gradient for the system What is the pressure head at C? (in other words, if we install a piezometer at C, how high would the water level rise?) If 1.5 cm of water flows through the soil in 2 min, what is the hydraulic conductivity for the soil? A=10 cm? 6cm 9cm 4cm SOIL- ---- DATUM 10cm
A sand layer of the cross-sectional area shown in the figure has been determined to exist for a 800-m length of the levec. The hydraulic conductivity of the sand layer is 1.65 m/day. Determine the quantity of water which flows into the ditch in m/min. Elv. 175 m Levec Elv. 130 m 2 m Ditch 180 m Impervious O Sand
The seepage loss in cm?/sec for a hydraulic structure, if the flow net contains 5 flow lines and 9 equipotential lines and the head causing flow is 20 m, k= 2.6 x 106 cm/sec is:
Refer 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 method
The coefficient of permeability below a dam is 12 m/day. The water in the upstream side is 32 meter higher than on the downstream side (level with the ground). To estimate the seepage below the dam, a flow net is graphically drawn such that the number of potential drops, Nd = 8 and the number of flow channels Nf = 3. The base of the dam is founded 1.8 m below the ground. Between the heel and the toe of the dam, a distance of 32 meters, there are 6 potential drops. a. Estimate the seepage per meter length of the dam in liters per minute. (IN EXPONENTIAL FORM AND IN 2 DECIMAL PLACES) b. Determine the uplift pressure at the heel in kPa. (IN 2 DECIMAL PLACES) c. Determine the uplift pressure at the toe in kPa. (IN 2 DECIMAL PLACES)

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7. The flow net for concrete dam situated on a soil cross section with an inclined base as shown. Compute the quantity if seepage per unit thickness through the cross section (in m³/day-m). Assume that k = 2 × 10ª cm/s. 7.5 m