CIL Tay Layuan NCICICNTCCS Wings NEVIEW VTC PICTODOC Find – Aal libri (Body) 11 – AA Aa TT A ALT AaBbccdc Aabbccde AaBbci AaBbcc Aab, A 2 ac Replace I U abs x x abe x, X A ab 1 Normal I No Spaci… Heading 1 Heading 2 Title Change Styles Select Create and Share Req Adobe PDF Signa Adobe Acrobat Font Paragraph Styles Editing 0.5 (12 marks) The cover of a landfill can be considered an infinite slope see the figure below) with a slope of 3(H): 1(V). The thickness of the cover is 1.5 m and the soil is silty clay with an angle of internal friction of 15. a cohesion of 20 kPa and unit weight of 18 kN/m’ and saturated unit weight of 19 kN/m (a) If the water table is at a depth of 1 m below the ground surface, calculate the factor of safety (FS) with respect to slope stability assuming that the weakest plane is at the bottom of the cover. (b) if there is no water table, repeat (a). (.e. Calculate the factor of safety (FS) with respect to slope stability assuming that the weakest plane is at the bottom). (c) For the case in (b), what is the maximum thickness of the cover that will give a factor of safety of 1.5? (assuming that the weakest plane is at the bottom of the cover. Also, no water table). (d) Based on your results in (a) to (c), answer the following: 1) Does the rise in ground water level increases or decreases the factor of safety? Why? ii) Does the increase in cover thickness increases or decreases the factor of safety? Why? Foreplan Figure 15.9 Winite slope ords: 0 English (U.S.) ES E 280%
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