a) Compute the effective stress right below В. b) Compute the effective stress at C. c) Compute the effective stress at D.
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- a. A vane shear test was conducted in a saturated clay. Theheight and diameter of the rectangular vane were 4 in.and 2 in., respectively. During the test, the maximumtorque applied was 230 lb ? in. Determine the undrainedshear strength of the clay.b. The clay soil described in part (a) has a liquid limit of58 and a plastic limit of 29. What would be the correctedundrained shear strength of the clay for design purposes?Use Bjerrum’s relationship for l [Eq. (3.40a)]. Determine the overconsolidation ratiofor the clay. Use Eqs. (3.42) and (3.45). Use s9o 5 1340 lb/ft2.ASAPRefer to Problem 6.1. Using Eqs. (6.3) and (6.29), estimate the average stress increase (Δσav) below the center of the loaded area between depths of 3 m and 6 m. 6.1 A flexible circular area is subjected to a uniformly distributed load of 150kN/m2 (Figure 6.2). The diameter of the load area is 2 m. Determine the stress increase in a soil mass at points located 3 m below the loaded area at r = 0. 0.4 m, 0.8 m, and 1 m. Use Boussinesq’s solution. Figure 6.2 Increase in pressure under a uniformly loaded flexible circular area
- A 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.Refer to the soil profile shown in figure below: Calculate TOTAL stress at point А. Knowing that dry unit weight =17.17 KN/M3 and saturated unit weight =18.4 KN/M3 e = 0.52 G- 2.66 Sand 5m G.W.T e-1 4m Clay G= 2.75 Select one: а. 9 b. 2 с. О O d. 1 Next page Assignment 1 Jump to... O O O O2 Refer to the soil profile shown in figure below CALCULATE TOTAL STRESS (ot) AT POINT B put of G.W.T Sand 5m Y sat = 20. 9 Clay 4m Ysat = 17. 8 Let the point A at depth "0", point B at depth "Sm". and point C at depth 9m Select one: Select one: O a. 102.3 KN/M2 Ob. 107 KN/M2 O c. 109 KN/M2 O d. 104.5 KN/M2 Next page evious page
- Water is flowing at the rate of 0.2 cc/see in an upward direction through a sand sample with k = 1 x 10-3 cm/sec. Thickness of sand sample is 10m and sectional area is 50 cm². Effective stress at middle of sample if y = 2t/m³, is3- A sand sample is subjected to drainage cutting test with a hollow cylinder device. Rupture occurs with increasing internal pressure while external pressure is constant. At the moment of rupture, the external stress is 200 kPa and the internal stress is 300| Kilopascals - be. Internal and external radii of the sample are 40 and 60 mm. A) Obtain the angle of soil friction. B) At the moment of rupture, what is the axial stress applied to the sample?a. A vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. Determine the undrained shear strength of the clay. b. The clay soil described in part (a) has a liquid limit of 58 and a plastic limit of 29. What would be the corrected undrained shear strength of the clay for design purposes? Use Bjerrum’s relationship for λ
- Q1: A. Answer in True or False 1. A soil has MOUSORT &Uroda You described Symber 4. Decidubing water Comont 5. Water molecules are considered polar and known as dipoles. T 19 A 6. Dry Density is the smallest density. 7. Capillary rise is directly proportional to the pore channel diameter. 8. The unconfined compressive strength is twice the undrained cohesion. 9. Piping or boiling occurs when effective stress equals to zero. 10. It is assumed that the secondary compression begins when the primary consolidation endsA vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. The clay soil has a undrained shear strength of 7.844 psi. It has a liquid limi of 58 and a plasic limi o 29. What would be the corrected undrained shear strength of the clay for design purposes? Using Bjerum's relationship for λ. λ = 1.7 - 0.54 log[PI(%)]100 psf Assignment: 30 psf - B 35° Solve the following problem, neatly and orderly. Follow your assignment or task guides. -150 psf Problem: A soil element is shown in Figure 2.33. Determine the following: (Compare the three methods) a. Maximum and minimum principal stresses 30 psf b. Normal and shear stresses on plane AB Figure 2.33