j: A dam shown in Figure 1 retains 10 m of water. A sheet pile wall (cutoff curtain) on the upstream side, which is used to reduce seepage under the dam, penetrates 7 m into a 20.3 m-thick silty sand stratum. Below the silty sand, there is a thick deposit of practically impervious clay. The average hydraulic conductivity of the silty sand is 2x10 cm/s. Assume that the silty sand is homogeneous and isotropic. a) Draw the flow net under the dam. b) Calculate the flow rate, q. c) Determine the hydraulic gradient at exit path ED. 10 m A 20.3 m 2.4 mt C 30.6 m -Sheet pile wall Clay (impervious) = 2 x 10 cm/s H

j: A dam shown in Figure 1 retains 10 m of water. A sheet pile wall (cutoff curtain) on the upstream side, which is used to reduce seepage under the dam, penetrates 7 m into a 20.3 m-thick silty sand stratum. Below the silty sand, there is a thick deposit of practically impervious clay. The average hydraulic conductivity of the silty sand is 2x10 cm/s. Assume that the silty sand is homogeneous and isotropic. a) Draw the flow net under the dam. b) Calculate the flow rate, q. c) Determine the hydraulic gradient at exit path ED. 10 m A 20.3 m 2.4 mt C 30.6 m -Sheet pile wall Clay (impervious) = 2 x 10 cm/s H

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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Question

j: A dam shown in Figure 1 retains 10 m of water. A sheet pile wall (cutoff curtain) on the
upstream side, which is used to reduce seepage under the dam, penetrates 7 m into a 20.3 m-thick silty
sand stratum. Below the silty sand, there is a thick deposit of practically impervious clay. The average
hydraulic conductivity of the silty sand is 2x10 cm/s. Assume that the silty sand is homogeneous and
isotropic.
a) Draw the flow net under the dam.
b) Calculate the flow rate, q.
c) Determine the hydraulic gradient at exit path ED.
10 m
A
20.3 m
B
2.4 mt C
30.6 m
-Sheet pile wall
E
k = 2 x 10 cm/s
Clay (impervious)
H

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