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(b)
One of the assumptions made in the ordinary slice method is that the interslice forces are neglected. Classify whether this assumption is realistic or not. (5 marks) Figure Q4 (b) shows the construction of a newly developed housing project at a hillside that was badly affected by a recent landslide. Hypothesize FOUR (4) possible causes which triggered this geotechnical problem with suitable illustration. (8 marks) As a consultant engineer, you are given a slope design task. A cut slope was excavated in a saturated clay with a slope angle, β=35∘, with the horizontal. Previous soil explorations showed that a rock layer was located at a depth of 15 m below the ground surface. Assuming an undrained condition and γ= 18.7kN/m3 and the undrained cohesive value, cu=75kN/m2 : Assume D= 1.5. The task is given as follow;
(i) Analyze the maximum height of the slope can be cut. (3 marks) (ii) Identify the nature of the critical circle failure. (3 marks) (iii) With reference to the top of the slope, plan your working area of the slope analysis by using slope software. (6 marks)
(i) Analyze the maximum height of the slope can be cut. (3 marks) (ii) Identify the nature of the critical circle failure. (3 marks) (iii) With reference to the top of the slope, plan your working area of the slope analysis by using slope software. (6 marks)