Assignment 2 Due date 21st May 2013 Weighting 15% Linked to learning outcome(s) 2, 3, 5 &6 1. The solving procedures must be provided. 2. Rational assumption(s) can be made if given information is not sufficient. 3. The assignment will be only marked in terms of “Grade”. Question 1. Part a: A pipe is laid along a proposed footing boundary with a depth of 5m. A uniform loading (100kPa) is given by the footing. 1. Calculate vertical stress increment (?sv) due to the uniform loading for A and B on the pipe. 2. If the stress increment at Point A must be less than 10kPa, what is the minimum distant, x?
Part b: A circular tank 10m in diameter has uniform load of 80kPa. 3. Calculate the stress increment (?sv) under the centre of tank at a depth of 8m below the tank. 4. Calculate the stress increment (?sv) ) under the edge of tank at a depth of 3m.
Question 2. Refer to the soil profile below, calculate and plot u, ?h, and ?h’ with depth at active state based on Rankine theory. 5m 4m ?’ = 30° ?’ = 25° c’ = 3kPa
Question 3. Part a: 1. Use Taylor’s chart to design an undrained slope height (H) for F = 1.3. (Given: ? = 45°, cu = 20kPa, ? = 16 kN/m3 and d/H = 2) 2. Refer to the information above, to increase F to 1.5, what is the slope height required? 3. To increase F, an alternative way is to reduce slope angle. Based on the information from part 1. What is the slope angle in order to achieve F = 1.5? Part b: 1. Use Cousin’s chart to calculate F. (Given: ? = 30°, c’ = 10kPa, ?’ = 25°, ? = 18 kN/m3 and H = 4m) 2. If the required F = 1.5, what is the maximum slope angle?