Q-5: The dam and flow nets shown in Figure below. The dam is 120 m long and has two 10 m sheet piles driven partially into the granular soil layer. Datum is at bottom impervious layer i) The quantity of seepage loss under the dam when k-2 x 10-³ cm/s ii) The exit gradient (at point X) iii) The pressure distribution on the base of the dam iv) The factor of safety with respect to piping 30 m Impervious 12 m 2m 10 m sheet pile 2 3.5 A B 40 m 5 C C' 0.4 2m D E F (5.4) (6.4) (6/9) 10 m sheet pile X F Y 8.5 m (8.4) (9.4) Scale: 0 Ţ Number of equipotential drops (10.4) KXK 10 m

Q-5: The dam and flow nets shown in Figure below. The dam is 120 m long and has two 10 m sheet piles driven partially into the granular soil layer. Datum is at bottom impervious layer i) The quantity of seepage loss under the dam when k-2 x 10-³ cm/s ii) The exit gradient (at point X) iii) The pressure distribution on the base of the dam iv) The factor of safety with respect to piping 30 m Impervious 12 m 2m 10 m sheet pile 2 3.5 A B 40 m 5 C C' 0.4 2m D E F (5.4) (6.4) (6/9) 10 m sheet pile X F Y 8.5 m (8.4) (9.4) Scale: 0 Ţ Number of equipotential drops (10.4) KXK 10 m

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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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
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Construct a 2D flow-net for the under-seepage problem of the dam below which rests on a 2-layer foundation. Both soil layers are isotropic in Darcy's law, with the isotropic permeabilities of the upper and lower layers being 1x10 and 3x10 m/s, respectively. State and use the transfer conditions about the change of angles of flowlines (Snell's law in seepage) as flows enter and exit from layer 1 to layer 2 through their interface, and the change of flow net aspect ratios. Set ((An/As), =1) to have a 'square' flow-net in the upper region and the 'non-square' one (An/As)2-ki Ik:) in the lower layer (s being the length in the flow of flow and n being normal to it). Compute the total flow rate due to the under-seepage. 4.00m 0.50m 7 1.00 m 5.00m 10.00m- 5.00m
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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
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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)