Answer Happy

G5. The figure below shows the section of the slope on the west side of the METU stadium, before it was paved. Piezometric head of water at the mid-point of the base of each slice has been measured as follows: Slice No : 1 2 3 4 5 6 Head of water (m): 0.5 2.3 3.1 1.4 0.0 NOT TO SCALE - 28m 16m horizontal -5m-+-5m-5m-+-5m-5m? The average of tests on undisturbed samples of soil taken at various points along the potential failure surface gave the following values for the soil properties: c' = 25 kPa; $' = 29°; Y = 18.7 kN/m³. Neglecting tension cracks, and assuming the centre of gravity of each slice to coincide with the mid-height, calculate the factor of safety, F₁, against failure by sliding along the surface shown, using 1 Fs -Σ[c'l + (w cosa − ul) tan ø'] - Σwsina where, for any slice, a = average angle between base and the horizontal ; W = weight; 1= length of base; u = average pore pressure at base. R= 28 m 3.0