The time required to reach 60% consolidation for a sample of 1 cm thick in odometer under condition of double drainge was found to be 35 sec. The time for a layer of 10 m thick to reach the same consolidation degree if drainage in one side. Negative

Results of a lavoratory consolidation test on a 5 meter thick clay (at a site) indicates t 50 = 12.2 minutes for the load increment of 8 tons/ sq ft. The lab sample had drainage on top and on the bottom. The lab sample height is 1.582 cm. a. Determine the coefficient of consolidation for the load range in cm squared/min. b. Based on the laboratory results above (a), compute the time it will take for 100 % consolidation of the 5 meter thick clay layer in the field. A sand layer overlies the clay layer and impervious rock underlies the clay layer. Answer the time in years.

A pressure increase of 250 kPa is imposed across a wide region above the depicted soil profile. The clay stratum is initially under normal consolidation and has a coefficient of consolidation (cv) of 0.002 cm2/s. The groundwater level sits 3.5 meters beneath the soil surface. Determine the settlement of the clay layer, in millimeters, 40 days following the application of the pressure increase. noted that The final settlement at the end of primary consolidation is equal to 515 mm.