Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 10, Problem 10.22P
To determine
Calculate the number of plates to be stacked before the specimen fails and the consistency for the clay.
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Question 10
A clay specimen was tested in undrained direct shear, under a normal stress of 50 kPa. The peak
shear stress measured was 32 kPa and the critical state shear stress measured was 22 kPa. What is
the critical state undrained strength of the clay specimen? Express your answer in kPa, but write only
the numeric answer in the text box
Assume that both a triaxial shear test and a direct shear test are to be performed on a sample of dry sand. When the triaxial shear test is performed, the specimen fails when the major and minor principal stresses are 80 and 20 lbs/in^2, respectively. When the direct shear test is performed, what shear strength can be expected if the normal stress is 4000 lbs/ft^2?
a）For clays, the failure line (one that connects the peak failure stresses) in the normally consolidated range does not have a cohesion intercept, whereas the failure line in the overconsolidated range has a cohesion intercept.
T or F
B）During the shearing phase of a CU test, the void ratio of a NC consolidated clay specimen will:
1 decrease.
2 could increase or decrease.
3 remain a constant.
4 increase.
C)What does the cohesion (that appears in the Mohr-Coulomb criterion) of OC clays depend on?
1the preconsolidation pressure.
2whether the failure stresses are total or effective.
3the soil type.
4everything listed here.
Chapter 10 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 10 - Prob. 10.1PCh. 10 - Prob. 10.2PCh. 10 - Prob. 10.3PCh. 10 - Prob. 10.4PCh. 10 - Prob. 10.5PCh. 10 - Prob. 10.6PCh. 10 - Prob. 10.7PCh. 10 - Prob. 10.8PCh. 10 - Prob. 10.9PCh. 10 - Prob. 10.10P
Ch. 10 - Prob. 10.11PCh. 10 - Prob. 10.12PCh. 10 - Prob. 10.13PCh. 10 - Prob. 10.14PCh. 10 - Prob. 10.15PCh. 10 - Prob. 10.16PCh. 10 - Prob. 10.17PCh. 10 - Prob. 10.18PCh. 10 - Prob. 10.19PCh. 10 - Prob. 10.20PCh. 10 - Prob. 10.21PCh. 10 - Prob. 10.22PCh. 10 - Prob. 10.23PCh. 10 - Prob. 10.24CTPCh. 10 - Prob. 10.25CTP
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- Steel plates with mass of 1500 g each were stacked on topof a 75 mm diameter and 150 mm high clay specimen,as shown in Figure P2.22 (attached). If the undrained shear strengthof the specimen is 45.0 kN/m2, how many plates can bestacked before the specimen fails? What is the consistencyterm for this clay?arrow_forwardA CD triaxial compression test conducted on a clay specimen revealed that c'=5 kPa and o'=22°. What is the major principal stress at failure if the confining pressure is 35 kPa? Solve the problem graphically and then analytically.arrow_forwardQ.9 An unconfined compression test was conducted on an undisturbed sample of clay. The initial area of the specimen is 1105 mm?. The load at failure measured by the proving ring was 32N and axial strain at failure was 0.162. The undrained shear strength of the clay will bearrow_forward
- Assume that both a triaxial shear test and a direct shear test are to be performed on a sample of dry sand. When the triaxial shear test is performed, the specimen fails when the major and minor principal stresses are 80 and 20 lbs/in^2, respectively. When the direct shear test is performed, what shear strength can be expected if the normal stress is 4000 lbs/ft^2? Show all work.arrow_forwardSTATEMENTS: A - an increase in volume is expected in 2:1 expanding type of clay when wet/saturated with water. B - cracking is expected when an expanding type of clay dries. A- both statements are trueB- neither statements are trueC- only statement A is true D- only statement B is truearrow_forwardCan 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.arrow_forward
- 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…arrow_forwardExplain the interlocking behavior of sand and its effects on the stress-strain behavior of sand?arrow_forward2) Table 1 contains data obtained from consolidated undrained tests on soft clay. You need to determine the shear strength parameters in term of total stress and effective stress. A different specimen of the same soil is also tested in undrained triaxial compression at a cell pressure of 150 kN/m2, and fails when the deviator stress is 75 kN/m2. Calculate the pore pressure in the specimen failure. In your opinion, what is the differences between total stress and effective stress? Table 1 Result from consolidated undrained tests Cell pressure during consolidation and shear (kN/m?) At failure Pore water pressure (kN/m²) Deviator stress (kN/m²) 200 120 120 400 250 240 800 480 460arrow_forward
- A standard oedometer test in the laboratory indicated that a 0.02 m thick clay specimen took 0.5 days to undergo 90% primary consolidation. How many days will a 2 m thick layer of identical clay sandwiched between sand layers and subjected to an identical stress increment take to undergo the same?arrow_forwardQuestion 4.12 A cube of reservoir rock with sides of 2.5 ft has a single vertical fracture of width 0.35 that passes completely through the rock. The matrix permeability is 1 mD. a) What is the permeability of the fracture (in D)? b) What is the average permeability of the cube if the flow is in the direction parallel to the fracture (in mD)? c) What is the average permeability of the cube if the flow is in the direction normal to the fracture (in mD)?arrow_forwardAn unconfined compression test was conducted on an undisturbed sample of clay. The initial area of the specimen is 1105 mm². The load at failure measured by the proving ring was 32N and axial strain at failure was 0.162. The undrained shear strength of the clay will bearrow_forward
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