Soil sample and flow condition are shown in the following figure: Inflow с 2m Outflow Soil ↑ B A Ysat of sand = 20 kN/m³, Yw= 20 kN/m³ (i) Find the head, h required to cause quick condition. h 2m 10m Compute the seepage force per unit volume at quick condition. Use cross-section area of tube as 1 m². (iii) A student accidentally broke the left hand riser tube to the point C at an elevation 2 m above point A. Assuming that the water level is now maintained at C, compute the new hydraulic gradient, effective stress at elevation A and seepage force at elevation A.

Please do it in a complete way, so I can easily understand it. Thank you to all of you

Example 1 A sand come test has been performed in a competed fill made with the soil described in 21 example 6.1 20 Ydmax 19.0 kN/m³ 19 95% (Yd,max) 18 17 =18.1 kN/m³ S=100% Wo -11.8% 16 0 5 7% 10 w (%) 15 16% 20 25 Initial mass of sand cone apparatus = 5.912 kg Final mass of sand cone apparatus = 2.378 kg Mass of soil recovered from hole = 2.883 kg Moisture content of soil from hole = 7.0% Density of sand = 1300 kg/m³ Volume of cone below valve = 1.114 x 10-3 m³

Solve !

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