A group of nine friction piles is driven through 5 m of clay with unconfined compressive strength of 60 kN/m2 followed by 10 m of clay with unconfined compressive strength of 100 kN/m2. The piles are in 3 rows and will be 1.00 m centres in a row and the rows will be 750 mm on centres. Each pile has a diameter of 300 mm. If a factor of safety of 2.5 is required, determine the maximum load that can be carried by the group. Take Nc = 9 and unit weight of clay as 16.4 kN/m3.

2Medium15 marks

Determine the size (i.e., diameter and depth) of a circular rapid mixing tank having a mechanical mixer, which is to be designed for treatment of water flow of 10 x 10^6 litres per day and for mean hydraulic detention time of 45 seconds. Also, calculate the power required to achieve a mixing intensity (G) of 450 s^-1. Assume viscosity of water = 0.89 x 10^-3 N.s/m^2 and depth of water to diameter of tank ratio of 2 : 1.

3Medium5 marks

Two points A and B having elevations of 585 m and 250 m respectively, above datum, appear on a vertical photograph obtained with a camera of focal length of 250 mm and flying altitude of 2300 m above datum. Their correlated photographic coordinates are as follows: Point A: x = +5.65 cm, y = +3.75 cm. Point B: x = -3.45 cm, y = +8.55 cm. Determine the ground coordinates of points A and B and calculate the horizontal distance between points A and B.

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