HSWPE 5
In order to find the factor of safety of downstream, slope during steady seepage, the section of the dam was drawn to scale 1 cm = 4 m. The following results were obtained on a critical slip circle.
Area of N-rectangle = 14.4 sqcm
Area of T-rectangle = 6.4 sqcm
Area of U-rectangle = 4.9 sqcm
Length of arc = 12.6 cm
Laboratory tests have furnished values 260 for effective angle of friction and 19.5 kN/m2 for cohesion, unit weight of soil = 19 kN/m3. Determine the factor of safety of the slope. (7 mark)
Answer :
∴𝐹𝑎𝑐𝑡𝑜𝑟 𝑜𝑓 𝑠𝑎𝑓𝑒𝑡𝑦 𝑜𝑓 𝑠𝑙𝑜𝑝𝑒 𝑖𝑠 1.41
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