(b) Seepage takes place beneath a concrete dam as shown in Figure Q3. The soilbeneath the dam is fine silty sand with hydraulic conductivity (permeability) of4.2 x 10- cm/sec and saturated unit weight of 19.5 kN/m³.i. Calculate the rate of seepage beneath the dam in m/day/m.ii. If a standpipe (piezometer) is installed at point A, how high will the water rise?i. Calculate the pore water pressure at point A.R1.75mImpervious stratumFigure Q3

(a) The flow rate beneath the dam is calculated as, q=kHNfNd=4.2×10-4 cm/sec×10-2×24×3600 m/day1…

Answered: (b) Seepage takes place beneath a…

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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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.
A soil column with a length of 20 cm and cross-sectional area of 50 cm2 was used to measure saturated hydraulic conductivity. The water depth on the surface was 5 cm. The volume of water collected under the column was 2 cm3 min-1. Calculate the saturated hydraulic conductivity of the soil.
Q2) For the concrete dam in Fig. 2, calculate the 1) seepage quantity in cm³/sec, and 2) pore water pressure (u) in the points 1 to 7 at the bottom of the dam. (yw = 10 kN/m³). the Nd. 1.5 m 10 m 3 1 .} 4 (k = 10-³ cm/sec) } 1 1 1 24 m " R I 1 1 Figure 2.
Determine the seepage through the homogeneous earthen dam section shown below, if coefficient of permeability of soil material of dam is 5 x 10-4 cm/sec. 10m Free Board = 2.0m 1 Horizontal Filter 20m 3. 2.5 30m- 36.50 m
In order to compute the seepage loss through the foundation of a cofferdam, flownets were constructed. The result of the flownet study gave Nf = 6, Nd = 16. The head lost during seepage was 19.68 ft. If the hydraulic conductivity of the soil is k = 13.12 x 10-5 ft/min, compute the seepage loss per foot length of the dam per day. a.1.9 ft3/day/foot length of the dam b.1.95 ft3/day/foot length of the dam c.1.39 ft3/day/foot length of the dam d.2.9 ft3/day/foot length of the dam e.2.25 ft3/day/foot length of the dam
Soil Mechanics
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
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 section of a concrete gravity dam with its flow net diagram is shown in Pigure 10.38. The coefficient of permeability of the soil (anistropic) in the vertical and horizontal directions are 0.25 m/day and 0.58 m/day, respectively. The length of dam perpendicular to the paper is 120 m. 1. Determine the number of pressure drops 2. Determine the seepage loss 3. Determine the total amount of water percolated in one year.
A sand layer of the cross-sectional area shown in Fig. ?-b (page 2) has been determined to exist for a 500-m length of the levee. The hydraulic conductivity of the sand layer is 2.3 m/day. Determine the quantity of water which flows into the ditch in m3/hr.
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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