The flownet at a site of a reservoir is shown in Figure P4.17. (a) How many flow channels are present? (b) How many equipotential drops are present? (c) What is the total head loss? (d) Calculate the head loss between each equipotential line. (e) Calculate the average flow rate if keg = 4 x 10-°cm/s (f) Calculate the porewater pressures at A and B located on opposite sides of the sheet pile retaining wall. (g) What would happen to the wall if the critical hydraulic gradi- ent at the bottom of it (C) is exceeded?

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter8: Stresses In A Soil Mass
Section: Chapter Questions
Problem 8.14P
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122
CHAPTER 4 ONE- AND TWO-DIMENSIONAL FLOWS OF WATER THROUGH SOILS
8 x 10-'cm/s, 4 x 10-3cm/s and 5 x 10-cm/s. Assuming that the ratios of the lateral to the
vertical hydraulic conductivities of the top, middle, and bottom layers are 2, 3, and 4 respectively,
calculate the equivalent hydraulic conductivity of the sand.
Critical thinking and decision making
4.17 The flownet at a site of a reservoir is shown in Figure P4.17. (a) How many flow channels are
present? (b) How many equipotential drops are present? (c) What is the total head loss? (d)
Calculate the head loss between each equipotential line. (e) Calculate the average flow rate if
keg = 4 x 10-cm/s (f) Calculate the porewater pressures at A and B located on opposite sides
of the sheet pile retaining wall. (g) What would happen to the wall if the critical hydraulic gradi-
ent at the bottom of it (C) is exceeded?
Water
Sheet pile retaining wall
4 m
Reservoir
1.5 m
3 m
5.5 m
Clayey sand /
Impervious clay
Transcribed Image Text:122 CHAPTER 4 ONE- AND TWO-DIMENSIONAL FLOWS OF WATER THROUGH SOILS 8 x 10-'cm/s, 4 x 10-3cm/s and 5 x 10-cm/s. Assuming that the ratios of the lateral to the vertical hydraulic conductivities of the top, middle, and bottom layers are 2, 3, and 4 respectively, calculate the equivalent hydraulic conductivity of the sand. Critical thinking and decision making 4.17 The flownet at a site of a reservoir is shown in Figure P4.17. (a) How many flow channels are present? (b) How many equipotential drops are present? (c) What is the total head loss? (d) Calculate the head loss between each equipotential line. (e) Calculate the average flow rate if keg = 4 x 10-cm/s (f) Calculate the porewater pressures at A and B located on opposite sides of the sheet pile retaining wall. (g) What would happen to the wall if the critical hydraulic gradi- ent at the bottom of it (C) is exceeded? Water Sheet pile retaining wall 4 m Reservoir 1.5 m 3 m 5.5 m Clayey sand / Impervious clay
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