(d) What is the maximum horizontal shear stress that the soil at Point A can take before failure? (e) What is the maximum shear stress along a plane oriented 60° from the horizontal plane that the soil at Point A can take before failure?
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- Question 1 Figure Q1 shows a vertical cross-section of a site. The ground water table is located at 2 m below the ground surface. Dry and saturated unit weights of the sand are 16 kN/m³ and 20 kN/m³, respectively. The clay is normally consolidated and has a saturated unit weight of 18 kN/m³ and an effective friction angle of 32°. The unit weight of water is taken as 10 kN/m³. (a) (b) (c) (d) (e) Calculate the vertical effective stress at Point A. Calculate the horizontal effective stress at Point A. Calculate the normal stress and shear stress acting on a plane oriented 60° from the horizontal plane at Point A What is the maximum horizontal shear stress that the soil at Point A can take before failure? What is the maximum shear stress along a plane oriented 60° from the horizontal plane that the soil at Point A can take before failure? 2m 4m 2m 8A Sand Clay Figure Q1Give the correct option In a drained triaxial test on consolidated clay the stress and angle are as follows: Deviator stress is 20 lb/in2 and friction angle is 21°. Calculate the effective confining pressure at failure?a) 21 lb/in2 b) 22.2 lb/in2 c) 25.4 lb/in 2 d) 17.9 lb/in2A dilatometer test was conducted in a clay deposit. The groundwater table was locatedat a depth of 3 m below the surface. At a depth of 8 m below the surface, the contact pressure spod was 280 kN/m2 and the expansion stress sp1d was 350 kN/m2. Determinethe following:a. Coefficient of at-rest earth pressure, Kob. Overconsolidation ratio, OCRc. Modulus of elasticity, EsAssume s 9o at a depth of 8 m to be 95 kN/m2 and ms 5 0.35.
- The profile at a site consists of 5m of sand overlying 10m of compressible clay, which in turn overlies a dense sand. The water table is at the top of the profile. The total unit weight of the top sand is 19kN/m3 and that of the clay is 18kN/m3. The Cv of the clay is estimated to be 5x 10-3 cm2/sec. Initially the clay is normally consolidated. It is planned to place a temporary fill that will exert a vertical load of 200kPa over the entire site. How long must the fill be in place so that, after it is removed, the maximum past pressure at every point in the clay is at least 50kPa larger than the vertical effective stress that existed before the fill was placed?Given the soil profile below, estimate the consolidation coefficient of the clay if Ao_z = 500 psf at the middle of the clay. Use one layer for the clay in your calculation. он 10 ft 20 ft וד Incompressible Sand' V Clay sat = 120 pct CR = 0.3 TIT RR = 0.15 Pp = 1776 pst 8 Sat 120 pct1. A sand specimen is isotropically consolidated in a triaxial test apparatus under a cell pressure equal to 420 kPa and then sheared with the drainage valves open (i.e. CD test). At failure, the deviatoric stress is 1046 kPa. Determine the major and minor principal stresses at failure and the effective internal friction angle (assume c' = 0). Plot the Mohr diagram.
- What is the equivalent coefficient of permeability (k) for all soil layers? where equivalent k(2 and 3) = 4.95 k1 and k4 = 4.69 k1 6 10 8 A lc D K2 ~ K3 N K1 K4 28 12Calculate the variations of o, u, and o' at points A, B, and C, and how high should the groundwater table rise so that the effective stress at C is 111 kPa? A Dry sand e=0,61 G = 2.66 4 m - B Saturated sand. 5 m e = 0,48 G=2.67 Clay © Cengage Learning 2014geotech. engineering A Thick layer of clay underlies a sand formation having a thickness of 4m. the groundwater is located 2m below the ground surface. The specific gravity of sand and clay is 2.65 with sand having an average void ratio of 0.52. the clay has a water content of 42%. Degree of saturation above the water table is 0.37. a. Compute the moist unit weight of the sand b. Total stress at a depth 10 m below the ground surface c. Effective stress at a depth of 10 m below the ground surface
- . Borings indicate that at a Staten Island, NY site, the top 6 meters is a 2) loose sand with a groundwater level at 3 meters below the ground surface. Below the sand is a 12 meter thick soft clay stratum. Assume sand unit weights are ymoist = 15 kN/cubic meter and ysat = 16 kN/cubic meter. Assume clay ysat = 20 kN/cubic meter. Calculate total, pore and effective stresses at 4, 13 and 18 meters deep.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 = 0.12What is the equivalent coefficient of permeability (k) for soil layers of k2 and k3? where k2= 1.75 k1 and k3 = 3.3 k1 10 8 IB K2 N K3 N K1 K4 .a k1 25.250 .b k1 12.625 .C k1 5.050 .d k1 2.525 28 12 4.