A surcharge of 100 kPa is applied over a large area above the soil profile shown in the figure below. The water table is located at the ground surface. Calculate the settlement developed at the surface in mm when primary consolidation settlement is completed (acceptable tolerance = 2%). Use a single clay layer in your calculations

2 m 2 m 3 m Figure P2.11 A Dry sand; e = 0.5 G, = 2.65 B Water table Sand Gs = 2.65 e = 0.6 C Clay w = 36% GS = 2.75 D Rock

H.W1: For the raft foundation with dimensions of 20 mx20 m shown in the figure, determine the immediate and consolidation settlement of the clay layer. V = 80 MN W.T 2 m Raft (20 mx20 m) eo=0.9 eF0.8 E=10 MPa 4 m Clay v=0.45 Ysat.= 20 kN/m³ Sand Hint: Ae = e, - ef

Given Well graded sand Specific gravity of soil = 2.65 Void ratio = 0.57 Porosity = 36.5% %3D Find the dry unit weight O 3.65 KN/m2 20.06 KN/m3 O 16.51 kn/m2 O 3.55 KN/m3 20.06 KN/m2 O 16.51 KN/m3

‘mormally consolidated clay given: 1S kKN/m® ateo=122 = 430 KN/m? ate=098 * 10° m/sec, Find: long in days will it take for a 3 m thick lsyer of the same drained both sides in the field to reach 50% consolidation? is settlement at 50% consolidation?

3. What ion is present in between 2:1 non expanding type of clay which causes its non-expanding nature/behavior? *       A. H+        B. K+       C. Na+       D. Li+

The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/sec. estimate the coefficient of permeability at a void ratio of 0.48. a. Using Casagrande equation b. Using kozeny - Carman equation.

If OCR = 1.5, Determine the Primary consolidation of the clay %3D sand Gs= 2.7 S = 0.32 3 m Cc = 0.3 Δσ-150 kPa Cr = 0.05 e= 0.75 7.4 m clay W= 40% 2 m

A stratum of normally consolidated clay of thickness 10 ft is drained on one side only. It has a hydraulic conductivity of h = 1.863 x 10^-8 in/sec and a coefficient of volume compressibility mv = 8.6 x 10-^4 in2/lb. Determine the time required for 80% consolidation by assuming a uniformly distributed load of 5250 lb/ft2.

Estimate the primary consolidation settlement of the clay in centimeters from a 28,000 kN load on an 8m by 10 m footing. The subsurface consists of a 10 meter thick layer of sand and gravel overlying a 4 meter thick layer of normally- consolidated clay (OCR=1). Assume sand and gravel layers do not settle. Below the soft clay is sand and gravel. Water table is 3 meters deep. Subsurface properties are below: W= 28 x 10 N 28 10 g maris) Footer 10 mBm moist=19.5 kN/cubm Water level Sand and gravel Y sat-19.6 kN/cub m y sat-19.4 N/cub m 4 m Clay Sand and gavel 1) Thickness of normally-consolidated clay = 4 meters 2) Water table is 3 meters deep 3) Sand and Gravel y moist=19.5 kN/cubic meter, y saturated= 19.6 kN/cubic meter 4) Soft Clay (OCR=1) a. Initial void ratio of clay layer (e o) = 0.81 b. y sat= 19.4 kN/cubic meter c. Compression Index of clay Cc=0.62 d. Swell Index of clay Cs = 0.12