6.12 An excavation is made for a canal that is fed by a stream, as shown in Figure P6.12. The measured flow into the canal is 0.25 x 10¬* m'/s per unit area. Two porewater pressure transducers, A and B, placed along a line par- allel to the slope and approximately at the canal mid- height gave readings of 3 kPa and 2.5 kPa. Assuming flow parallel to the slope, estimate the hydraulic conductivity.
6.12 An excavation is made for a canal that is fed by a stream, as shown in Figure P6.12. The measured flow into the canal is 0.25 x 10¬* m'/s per unit area. Two porewater pressure transducers, A and B, placed along a line par- allel to the slope and approximately at the canal mid- height gave readings of 3 kPa and 2.5 kPa. Assuming flow parallel to the slope, estimate the hydraulic conductivity.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Q. 6.12
Transcribed Image Text:Excavation
Plan
1.2
Slope
2 m
4 m
Excavation
FFFFFFEE
Silt
21 m
Cross section a-a.
8 m
FIGURE P6.9
Not to scale
30 m
Canal
Clay:
FEL: 99.5 m
-EL: 99.0 m
EL: 98.0 m
EL: 96.48 m
R
-Sandy-silt seam
River
0.5 m (average)
FIGURE P6.11
20°
4 m
Stream
Rock outcrop
Canal
FIGURE P6.12
130 CHAPTER 6 ONE-DIMENSIONAL FLOW OF WATER THROUGH SOILS
6.12 An excavation is made for a canal that is fed by a stream,
as shown in Figure P6.12. The measured flow into the
canal is 0.25 x 10 m'/s per unit area. Two porewater
pressure transducers, A and B, placed along a line par-
allel to the slope and approximately at the canal mid-
height gave readings of 3 kPa and 2.5 kPa. Assuming flow
parallel to the slope, estimate the hydraulic conductivity.
6.13 A well of 0.1 m radius is part of a wellpoint network to
keep an excavation dry (Figure P6.13). The groundwater
at the far edge of the excava
the base.
(a) Calculate the radius of i
(b) Calculate the maximum
(c) Plot the drawdown cur
(d) For the radius of influe
discharge if the well radi
compare it to the dischar
Wellpoint-
Flow
y Original GWL
2 m
Excavation
0.1 m
Drawdown
Iosm
8 m
0.5 m
k = 5.8. 10° ms
9. = 13.2. 104 m³s
8 m
Impermeable
FIGURE P6.13
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