Direction Impervious layer of flow Impervious layer Figure 7.31 7.6 The results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5): • Constant-head difference = 550 mm • Water collected in 7 min = • Void ratio of sand = 0.8 450 cm³ Determine: a. Hydraulic conductivity, k (cm/sec) b. Seepage velocity 1.7 In a constant-head permeability test, the length of the specimen is 200 mm and the cross sectional area is 78.5 cm2. If k = 2.1 X 10-2 cm/sec, and a rate of flow of 130 cm3/min has to be maintained during the test, what should be the head difference across the specimen? 7.8 The following data are for a falling-head permeability test:

Structural Analysis
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Chapter2: Loads On Structures
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How to solve 7.6 

Direction
Impervious layer
of flow
Impervious layer
Figure 7.31
7.6 The results of a constant-head permeability test for a fine sand sample having a
diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5):
• Constant-head difference = 550 mm
• Water collected in 7 min =
• Void ratio of sand = 0.8
450 cm³
Determine:
a. Hydraulic conductivity, k (cm/sec)
b. Seepage velocity
1.7 In a constant-head permeability test, the length of the specimen is 200 mm
and the cross sectional area is 78.5 cm2. If k = 2.1 X 10-2 cm/sec, and a rate of
flow of 130 cm3/min has to be maintained during the test, what should be the
head difference across the specimen?
7.8 The following data are for a
falling-head permeability test:
Transcribed Image Text:Direction Impervious layer of flow Impervious layer Figure 7.31 7.6 The results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5): • Constant-head difference = 550 mm • Water collected in 7 min = • Void ratio of sand = 0.8 450 cm³ Determine: a. Hydraulic conductivity, k (cm/sec) b. Seepage velocity 1.7 In a constant-head permeability test, the length of the specimen is 200 mm and the cross sectional area is 78.5 cm2. If k = 2.1 X 10-2 cm/sec, and a rate of flow of 130 cm3/min has to be maintained during the test, what should be the head difference across the specimen? 7.8 The following data are for a falling-head permeability test:
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