The following results were obtained from CU tests on a clay soil that is the foundation material for an embankment. 03 (kPa) 300 400 600 0₁-03 (kPa) 331 420 487 Au (kPa) 111 160 322 (a) Determine the total and effective principal stresses for all three tests (You may summarize them in a table). (b) Recommend the shear strength parameters to be used for short-term and long-term analyses. The maximum confining pressure (cell pressure) at the depth of interest is 300 kPa. (Note: the clay is a normally consolidated one).

Please answer all questions based on the scenario Question #1:                                                  Considering the water upstream of the dam, a) What will be the seepage loss of that water downstream per year? b) What will the uplift force be on the dam? Question #2: What would the stress in the center of the dam be at the middle of the bottom layer? Consider both the overburden pressure and that due to the loading. Question #3: A sieve analysis was performed on a sample of the top layer of the soil, with the results shown below:   Sieve Size (in.)   1/2   3/8 No. 4 No. 8 No. 16 No. 30 No. 40 No. 50 No. 100 No. 200   pan Amount retained (g) 0 0 21.6 39.5 77.6 102.6 89.1 95.6 90.6 60.4 33.3 Do the following: a) Calculate the percent retained and percent passing each sieve, and graph the results on a semi-log graph (you may use the attached chart, or graph in Excel and include with your submission). Then, characterize…

1. Test A set of 4-in diameter direct shear tests were conducted on a lightly cemented sand. Test results are as shown. Plot the data (units = psf) and determine c' (in psf) and '. How would c' change if there were no cementation? Number 1 2 3 Forces At Failure Normal (lb) 60 120 180 Shearing (lb) 40 71 108 Shear Stresses at Failure Normal (psf) Shearing (psf) 688 458 1375 814 2063 1238 c' = c' = 29.5 degrees 57.3 psf 0.4 psi

A soil specimen (100 mm × 100 mm × 100 mm) is subjected to the forces shown in Figure below. Determine (a) the magnitude of the principal stresses, (b) the orientation of the principal stress plane to the horizontal, (c) the maximum shear stress, and (d) the normal and shear stresses on a plane inclined at 208 clockwise to the horizontal. 8 kN 2 kN 12 kN 4 kN