Practice_Problems_2

2 calculate the pore water pressure at points a b c d

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Unformatted text preview: per meter width of the dam. 2. Calculate the pore water pressure at points A, B, C, D and E. 3. Factor of safety against heave at the downstream. Use method suggested by Harza (1935). Answers:1) 7.2x10-5m3/s (/m), 2) uA=96.14kPa, uB=90.16kPa, uC=78.4kPa, uD=156.96kPa, uE=255.06kPa, 3)F.S. = 3.7 2 50 kPa 3) Refer to the soil element representing the state of stress for two planes. These planes are oriented at right angle with respect to each other. a. b. c. Show the stresses on the Mohr’s circle. Calculate the major and minor principal stresses in kPa Calculate the angle between the major principal plane and the horizontal axis. 12 kPa 10 kPa 10 kPa 12 kPa 50 kPa Answers: a) b)σ1=53.3kPa, σ 3=6.67kPa c)θ=15.5o clockwise 4) A circular water tank shown in figure imparts a bearing pressure of 3000lb/ft2. a) Compute the geostatic stress, σz, at point A. This is the stress that existed before the tank was built. b) Compute the induced stress at point A (Δσz) due to the weight of the tank. c) Combine the results from a and b to find the total stress at point A after the tank is built. 120 ft STEEL TANK Dense sand γ = 128 lb/ft3 15ft 50ft A Answers: a) 6400 kb/ft2, b)1558 lb/ft2, c)7958 lb/ft2 3...
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