A spread footing with a dimension of 2.0 m x 2.0 m is embedded in uniform clay at a depth of 1.0 m to support a vertical downward load of 300 kN. The pre-consolidation stress of the soil is 50 kPa and their compression indices are Cr/(1+e0) and Cc/(1+e0) of 0.025 and 0.11, respectively. The soil has unit weights of 16.8 and 17.8 kN/m3 above and below the groundwater table, respectively. The soil stratum extends to a great depth and the ground water table is at a depth of 1.5 m below the ground surface. Estimate the consolidation settlement of this footing. Use 2:1 method to estimate induced stress due to the applied load. The depth for settlement calculation is assumed to be 5 m below the foundation and use layer thickness of 1 m.

Shear Stress 5. Please provide proper discussion and illustration. Clear and complete solution please thank you.    A clay soil has an undrained shear strength (cohesion, Cu) of 800 psf. How could the strength of this soil be increased?

A circular footing with a radius of r = 4.0 ft will be embedded D = 2 ft in uniform clay. The top of the foundation is at the surface. The water table is at the ground surface. An intact sample of the clay with Gs=2.75 was obtained using a thin-walled Shelby tube from a depth of 10 ft below the ground surface. The sample was saturated and has a gravimetric water content of 45 %. Estimate its void ratio e0 and total unit weight y _in pcf. Ovp' = 800psf Void Ratio 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 do 10 0.1 0 2 z/r, depth in radii 6 7 8 9 Cr = 0.07 100 1000 Effective Stress (psf) 0.2 0.3 0.4 0.6 0.81.0 7.0 10.0 Cc = 0.3 8.0 9.0 5.0 6.0 I, stress in percent of surface contact pressure 2 3456 8.10 10000 3.0 2.5 (2.0) 1.25 20 30 40 50 60 80 100 1.0 PAG 0.75 Note: Numbers on curves indicate offset distances in radii, x/r. 2r Z 0.5 0₂- KAB X 0.25 IX q 100 0, 10 FIGURE 4.10 Chart for calculating the increase in vertical stress beneath a uniformly loaded circular area. (From NAVFAC DM-7.1, 1982,…

This is for foundation engineering review. Please show work and choose from the answer choices

11.19 Refer to Figure 11.45. A square footing, 2 x 2 m in size, supports a column load of 300 kN. The soil characteristics are given in the figure. Field monitoring indi- cated that the foundation settlement was 19 mm during the first 12 months. a. Estimate the average stress increase in the clay layer due to the applied load. b. Estimate the primary consolidation settlement. c. What is the degree of consolidation after 12 months? d. Estimate the coefficient of consolidation for the pressure range. e. Estimate the settlement in 24 months. 300 kN 1m 2m x 2 m Ya = 14 kN/m3 I m Yu = 17 kN/m 24% G, = 2.74 LL = 46 2 m o'= 40 kN/m² C, = 1/5C. Sand Clay Figure 11.45 O Cengrge learring 2014