A retaining wall is 4 metres high. Its back is vertical and it has got sandybackfill upto its top. The top of the fill is horizontal and carries a uniformsurcharge of 85kN/m2. Dry density of soil = 18.5 kN/m3. Moisture content of soil above water table = 12%. Angle of internal friction of soil = 30°, specific gravity of soil particles = 2.65. Porosity of backfill = 30%. The wall friction may be neglected. Determine the following(i) Depth of Zero tension Crack

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