A river bed consists of a layer of sand 8.25 m thick overlying impermeable rock; the depth of water is 2.50 m. A long cofferdam 5.50 m wide is formed by driving two lines of sheet piling to a depth of 6.00 m below the level of the river bed, and excavation to a depth of 2.00 m below bed level is carried out within the cofferdam. The water level within the cofferdam is kept at excavation level by pumping. If the flow of water into the cofferdam is 10.25 m'/h per unit length, a. Draw the flow net for the seepage flow -5.50m b. what is the coefficient of permeability of the sand? Sheet piling c. what is the hydraulic gradient immediately below the excavated surface? d. What is the lateral earth pressure at points A, B,. 2.50m Evi 2.00m vel Datum y=115 pcf =30° 6.00m 2.25m Natteale
A river bed consists of a layer of sand 8.25 m thick overlying impermeable rock; the depth of water is 2.50 m. A long cofferdam 5.50 m wide is formed by driving two lines of sheet piling to a depth of 6.00 m below the level of the river bed, and excavation to a depth of 2.00 m below bed level is carried out within the cofferdam. The water level within the cofferdam is kept at excavation level by pumping. If the flow of water into the cofferdam is 10.25 m'/h per unit length, a. Draw the flow net for the seepage flow -5.50m b. what is the coefficient of permeability of the sand? Sheet piling c. what is the hydraulic gradient immediately below the excavated surface? d. What is the lateral earth pressure at points A, B,. 2.50m Evi 2.00m vel Datum y=115 pcf =30° 6.00m 2.25m Natteale
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Geotechnical problem
Transcribed Image Text:A river bed consists of a layer of sand 8.25 m thick overlying impermeable rock; the depth of water is 2.50 m. A long cofferdam 5.50 m
wide is formed by driving two lines of sheet piling to a depth of 6.00 m below the level of the river bed, and excavation to a depth of
2.00 m below bed level is carried out within the cofferdam. The water level within the cofferdam is kept at excavation level by pumping. If
the flow of water into the cofferdam is 10.25 m/h per unit length,
a. Draw the flow net for the seepage flow
5.50m
b. what is the coefficient of permeability of the sand?
Sheet
piling
c. what is the hydraulic gradient immediately below the excavated surface?
d. What is the lateral earth pressure at points A, B, .
2.50m
Escavtin
2.00m
vel
Datum
y=115 pcf
p=30°
6.00m
2.25m
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