Peak shear Dense sand strength Uitimate shear oc clay strength Shear stress Dense sand/OC Clay Shear displacement Loose sand/ NC clay Loose sand/NC Clay Shear displacement Peak shear strength 600 400 200 Residual shear strength Horizontal deformation (%) Dimension of specimen in the direction of shear force Fig þ Shear stress (KN/m) ompression Expansion

Peak shear Dense sand strength Uitimate shear oc clay strength Shear stress Dense sand/OC Clay Shear displacement Loose sand/ NC clay Loose sand/NC Clay Shear displacement Peak shear strength 600 400 200 Residual shear strength Horizontal deformation (%) Dimension of specimen in the direction of shear force Fig þ Shear stress (KN/m) ompression Expansion

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter3: Natural Soil Deposits And Subsoil Exploration

Section: Chapter Questions

Problem 3.19P

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A sample of sand is sheared in the following manner. First an all around normal stresso 350 kPa is applied to the sample. Next a shear stress is applied to the horizontal pia while the normal stress remains constant. The shear stresses at failure are + 186 kPa. Ihe initial stress and stress condition at failure are shown below 350 kPa 350 kPa 186 kPa 350 kPa 350 kPa ー550 kPa 550 kPa 186 kPa 350 kPa 350 kPa Initial Conditions At Failure Determine the Following: fo A) Assuming c, = 0, draw a failure envelope for the soil. Define the friction angle ( the soil. B) Draw the Mohr's Circle at failure for the test. C) Show the location of the pole. D) Define the maximum and minimum principal stresses at failure. E) Define the normal stress corresponding to the maximum shear stress
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
Can TRIAXIAL TESTS be performed on sand samples? Briefly explain. The results of an undrained triaxial test on a clay soil sample are given in table below Cell Pressure (kN/m2) 200 400 600 Additional Axial Load at Failure (N) 342 388 465 Each sample, originally 76mm long and 38mm in diameter, experienced a vertical deformation of 5.1mm. Evaluate the stress at failure for each cell pressure given in table above. Draw Mohr Circles and determine the shear strength parameters of the soil.
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)].
help asap huhu A cylindrical specimen of a saturated soil fails under a stress of 150 kPa in an unconfined compression test . The failure plane makes an angle of 52° with horizontal a.) Compute the angle of internal friction of soil b.) Compute the cohesion of the soil c.) compute the shearing stress at failure Plane.
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)].
A series of vane shear tests have been performed on a soft clay stratum. The results of thesetests are as follows: Depth (m) 5.0 5.5 7.5 9.0Tf (N-m) 9.0 10.7 12.0 14.7 The vane was 60 mm in diameter and 120 mm long. The soil has a liquid limit of 100 and aplastic limit of 30. Compute the undrained shear strength for each test, then develop a plot ofundrained shear strength versus depth. This plot should have depth on the vertical axis, withzero at the top of the plot.
[?] ?? = [150 −60−60 −180]➢ Determine and graph using Mohr's circle the principal stresses and theaddresses associated with these.➢ Determine and graph the maximum shear stresses.➢ Plot the possible failure planes.➢ Finally, what is the value of the maximum tangential stress and at whatorientations take place?
24.A series of consolidated, undrained triaxial tests were carried out on specimens of asaturated clay under no backpressure. The test data at failure are summarized:Confiningpressure (kPa) Deviator stress(kPa) Pore waterpressure (kPa) 150 192 80300 341 154450 504 222 a. Draw the Mohr circles and find the cohesion and friction angles in terms of effectivestresses.b. Compute Skempton’s A- parameter at failure for all three specimens.c. Is the soil normally consolidated or over consolidated? Why?d. Another specimen of the same day that was consolidated under a cell pressure of 250 kPa wassubjected to a consolidated, drained tri axial test. What would be the deviator stress at failure?
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.
For a Brinell Hardness Test, find the BHN if the force applied is 100kgf with indenter diameter of 10mm and indentation diameter of 8.4mm For a Vicker's Test, find HV in MPa if applied force is 100kgf with impression diagonals are 10mm and 8.4mm, respectively
2. A series of consolidated, undrained triaxial tests were carried out on specimens of a saturated clay under no backpressure. The test data at failure are summarized: Confining Pressure (kPa) Deviator Stress (kPa) Pore Water Pressure (kPa) 150 192 80 300 341 154 450 504 222 a. Draw the Mohr circles and find the cohesion and friction angles in terms of effective stresses. b. Compute Skempton’s A-parameter at failure for all three specimens. c. Is the soil normally consolidated or overconsolidated? Why? d. Another specimen of the same clay that was consolidated under a cell pressure of 250 kPa was subjected to a consolidated, drained triaxial test. What would be the deviator stress at failure?