Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 3, Problem 3.17P
(a)
To determine
Find the undrained shear strength of the clay.
(b)
To determine
Find the corrected undrained shear strength of the clay for design purposes.
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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 [Eq. (3.40a)].
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
Refer to Figure P3.2. Vane shear tests were conducted in the clay layer. The vane (tapered) dimensions were 63.5 mm (d) x 127 mm (h), iB = iT = 458 (see Figure 3.23). For the test at A, the torque required to cause failure was 51 N ? m. For the clay, given: liquid limit = 46 and plastic limit = 21. Estimate the undrained cohesion of the clay for use in the design by using Bjerrum’s l relationship [Eq. (3.40a)].
Chapter 3 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Refer to Figure P3.3. Use Eqs. (3.10) and (3.11)...Ch. 3 - Prob. 3.4PCh. 3 - Prob. 3.5PCh. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10P
Ch. 3 - Prob. 3.11PCh. 3 - Following are the standard penetration numbers...Ch. 3 - Prob. 3.13PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20PCh. 3 - Prob. 3.21PCh. 3 - Prob. 3.22PCh. 3 - Prob. 3.23PCh. 3 - Prob. 3.24PCh. 3 - Prob. 3.25PCh. 3 - Prob. 3.26PCh. 3 - Prob. 3.27P
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- Give 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/in2arrow_forwardA soil element is shown in Figure 2.21. Determine the following using Mohr’s Circle: a. Maximum and minimum principal stressesb. Normal and shear stresses on plane ABarrow_forwardRefer to Figure P3.3. Vane shear tests were conducted in theclay layer. The vane (tapered) dimensions were 63.5 mm(d) 3 127 mm (h), iB 5 iT 5 458 (see Figure 3.23). For the test at A, the torque required to cause failure was 51 N ? m.For the clay, given: liquid limit 5 46 and plastic limit 5 21.Estimate the undrainedcohesion of the clay for use in thedesign by usingBjerrum’s l relationshiparrow_forward
- A compressive load P=60kN is applied to the surface of a soil. o Find the vertical compressive stress at a point 2m below the surface at a distance of 1m away from the line of action of the force o Plot the distribution of vertical compressive stress on the plane 2m (i.e. for z = 2m) below the surface of the soil, for various radial distances up to 2m from the line of action of the force (i.e. r =, 0,……,2) o Plot the distribution of the vertical compressive stresses on various horizontal planes (i.e. for various values of z=0.5, 1, ……, 3) along the vertical axis (i.e. at r=0arrow_forwardUse Eq. (6.14) to determine the stress increase () at z = 10 ft below the center of the area described in Problem 6.5. 6.5 Refer to Figure 6.6, which shows a flexible rectangular area. Given: B1 = 4 ft, B2 = 6 ft, L1, = 8 ft, and L2 = 10 ft. If the area is subjected to a uniform load of 3000 lb/ft2, determine the stress increase at a depth of 10 ft located immediately below point O. Figure 6.6 Stress below any point of a loaded flexible rectangular areaarrow_forwardRefer to Figure 10.43. A strip load of q = 1450 lb/ft2 is applied over a width with B = 48 ft. Determine the increase in vertical stress at point A located z = 21 ft below the surface. Given x = 28.8 ft. Figure 10.43arrow_forward
- Refer to Figure 10.46. A flexible circular area of radius 6 m is uniformly loaded. Given: q = 565 kN/m2. Using Newmarks chart, determine the increase in vertical stress, z, at point A. Figure 10.46arrow_forwardA soil profile consists of a clay layer underlain by a sand layers as shown. A tube is inserted into the bottom sand layer and the water level rises to 1.2m above the ground surface. Determine the effective stress at pt. A Determine the effective stress at pt. B. Determine the effective stress at pt. C Please answer this asap. For upvote. Thank you very mucharrow_forwardThe figure shows a layer of granular soil in a tank with an upward seepage by applying water through the valve at the bottom of the tank. The loss of head caused by upward seepage between the levels of A and B is 0.71m. The void ratio of the soil is 0.511 ,its specific gravity is 2.719, h1=0.99m, h2=2.06m, h3=2.91m. 1. Compute the effective stress at C in kPa. 2. .Compute the critical hydraulic gradient. X IN FIGURE IS 1 = 0.71marrow_forward
- Determine the stress increase due to the embankment load at point A as shown in Figure 2. The unit weight of the embankment fill is 115pcfarrow_forwardA vane shear test was performed on a clay layer using a vane with a diameter of 75.8 mm and a height of 151.6 mm. The vane was inserted to the total length of the vane (151.6 mm) but the top edge was exposed. The maximum moment required to rotate the vane was measured as 145 N·m. The liquid and plastic limits of the soil were 48 and 21, respectively. Determine the design undrained shear strength of the clay.arrow_forward
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