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Following results were obtained from a consolidation test. Initial height of sample is 2.5cm and height of solid particles is 1.25cm.
Pressure $kN/m^{2}$ 0 13 27 54 108 214 480 960 1000
DUR 0 0.0 0.004 0.016 0.044 0.104 0.218 0.340 0.420

Plot the pressure variation curve and determine the compression index and preconsolidation.