A bridge pier is to be constructed in a riverbed by constructing a cofferdam, as shown in Figure E4.7a. A cofferdam is a temporary enclosure consisting of long, slender elements of steel, concrete, or timber members to support the sides of the enclosure. After construction of the cofferdam, the water within it will be pumped out. (a) Draw the flownet. (b) Calculate the minimum flow rate of a pump required to keep the water level at the base of the excavation. (c) Calculate the porewater pressures at and B. 16.5 ft Sheet piling Water 7.5 ft Water Excavation . 6 ft 5 ft "Silty sand "Keg = 4 x 107 ft/s 6.75 ft Homogeneous, impervious clay
A bridge pier is to be constructed in a riverbed by constructing a cofferdam, as shown in Figure E4.7a. A cofferdam is a temporary enclosure consisting of long, slender elements of steel, concrete, or timber members to support the sides of the enclosure. After construction of the cofferdam, the water within it will be pumped out. (a) Draw the flownet. (b) Calculate the minimum flow rate of a pump required to keep the water level at the base of the excavation. (c) Calculate the porewater pressures at and B. 16.5 ft Sheet piling Water 7.5 ft Water Excavation . 6 ft 5 ft "Silty sand "Keg = 4 x 107 ft/s 6.75 ft Homogeneous, impervious clay
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A bridge pier is to be constructed in a riverbed by constructing a cofferdam, as shown in Figure
E4.7a. A cofferdam is a temporary enclosure consisting of long, slender elements of steel, concrete,
or timber members to support the sides of the enclosure. After construction of the cofferdam, the
water within it will be pumped out.
(a) Draw the flownet.
(b) Calculate the minimum flow rate of a pump required to keep the water level at the base of
the excavation.
(c) Calculate the porewater pressures at A and B.
16.5 ft
Sheet piling
Water
7.5 ft
Water
Excavation
6 ft .
'5 ft
18 1
"Silty sand
"Keg = 4 x 10-7 ft/s
6.75 ft
Homogeneous, impervious clay
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