Assignments and Project 2017s.pdf - Geotechnical...

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Geotechnical Engineering Tutorial Questions Assignment Questions Group Project Subject Timetable Spring 2017
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University of Technology, Sydney 48360 Geotechnical Engineering Faculty of Engineering and IT 1 Spring 2017 TUTORIAL 1 BASIC DESIGN 1. Consider the semi-circular mechanism shown in the figure below for the failure of a long strip footing on a soil deforming under undrained conditions. Based on this mechanism failure causes a rotation about point O. The following soil properties are known: t = 20 kN/m 3 c u = 100 kPa u = 0 a) Calculate the ultimate bearing pressure for the footing when the soil deforms under undrained conditions. b) Evaluate the effects of any surcharge, q o , which may be applied on the surface of the soil, on the ultimate bearing capacity of the footing. 2. Write an expression for the undrained bearing capacity of a strip footing shown in the figure opposite. Assume the slip mechanism shown, which is an arc centred above one edge of the footing (point O). You may assume the following parameters are given: t , c u and u = 0. Determine the minimum pressure that causes failure of the soil. 3. A long vertical drain is going to be made in a soil. Assume the failure plane shown in the figure opposite and evaluate the safety of the cut under the following conditions: (a) Undrained conditions (b) Drained conditions Consider all possible cases for water table in the drain and pore water pressures. The following clay properties are known: t = 22 kN/m 3 c u = 30 kPa u = 0 c = 0  = 27 You should assume that the lining of the drain does not provide any resistance to failure. B B O q B R O q 5m 45 o
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