Q.4/ A normally consolidated (N.C) clay was found to have p-15°, q'= 30°. The soil specimen was tested in a consolidated undrained triaxial test (CU) under a cell pressure 150 kN/m². Determine four of the followings: a) Deviator stress at failure b) Major principal stresses at failure c) Minor principal stresses at failure

Q.4/ A normally consolidated (N.C) clay was found to have p-15°, q'= 30°. The soil specimen was tested in a consolidated undrained triaxial test (CU) under a cell pressure 150 kN/m². Determine four of the followings: a) Deviator stress at failure b) Major principal stresses at failure c) Minor principal stresses at failure

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Shear Strength Of Soil

Section: Chapter Questions

Problem 10.20P

See similar textbooks

Related questions

Q: What is the turthosity of the soil?

Q: Please help.. Triaxial test is another method or test of determining shear strength of a soil,…

A: The objective of the question is to understand the formulae used in the Triaxial test for…

Q: nyw For a given soil, show that: w. Ysat-nyw.

A: To prove the relationship between water content,porosity and saturated unit weight

Q: What exaclty are the boundry conditions?

A: In this question basic concepts of boundary conditions is being asked

Q: Estimate

Q: Water is added to soil compaction process to enhance the compaction process will.. I. Act as…

A: please find attached solution below

Q: For a soil element in foundation (sand deposits, no cohesion for sand), known major principle stress…

Q: (c) The maximum past pressure oym' at depths 25 ft and 35 ft are 3000 lb/ft? and 2500 lb/ft?,…

A: The ability of the soil to compress or settle with respect to the increase in effective stress by…

Concept explainers

Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.

Question

Shear Strentgh of the soil

Q.4/ A normally consolidated (N.C) clay was found to have q-15°, q'= 30°. The soil specimen was
tested in a consolidated undrained triaxial test (CU) under a cell pressure 150 kN/m². Determine
four of the followings:
a) Deviator stress at failure
b) Major principal stresses at failure
c) Minor principal stresses at failure
d) Pore water pressure at failure
e) The A-factor (pore water pressure parameter at failure)

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1: Stress path equation

Step 2: Given

Step 3: Calculation

Solution

Step by step

Solved in 4 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Test for determination of shear strength

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

Give me c, d&e answers only
Below are results from three unconsolidated undrained triaxial tests performed on a fully saturated clay specimen: Test No. 1 2 Minor principal stress (psi) Major principal stress at failure (psi) 10 25 33 22 37 45 Moisture content = 21 % Determine: a) Void ratio (e) of the soil. You may use eS = wG_ (assume Gs = 2.70) %3D b) Deviatory stress at failure for each test trial c) Shear strength parameters (cu and ø). Hint: Sketch the Mohr's circles for the three trials. 3.
A CU triaxial test was carried out on a silty clay that was isotopically consolidated using a cell pressure of 125 kPa. The following data were obtained: Axial load (kPa) 0 5.5 11.0 24.5 28.5 35.0 50.5 85.0 105.0 120.8 Axial strain, E₁ (%) 0 0.05 0.12 0.29 0.38 0.56 1.08 2.43 4.02 9.15 Au (kPa) 0 4.0 8.6 19.1 29.3 34.8 41.0 49.7 55.8 59.0 (a) Plot the deviatoric stress vs. axial strain and excess porewater pressure vs. axial strain, respectively. (b) Determine the undrained shear strength (su). (Note: we assume that the sample reaches failure). (c) Determine the total principal stresses (0₁,03) and the effective principal stresses (0₁, 03') at the failure, respectively.
2. A soil specimen is subjected to a tri-axial test. The soilspecimen is cohesionless. If the shear stress that causesfailure is 280 kPa and the normal stress at failure is only480 kPa.a) Determine the angle of shearing resistance,b) Determine the angle that the failure planemeasured from the major principal plane.c) Determine the total axial stress at which failure isexpected to occur.
A sample of dry sand is tested in direct shear. Theshear box holding the sample has a circular crosssection with a diameter of 50 mm. The normal(compressive) load imposed is 200 N. The sam-ple shears when the shear force is 130 N.(a) Determine the test normal stress and shearstress at failure.(b) Determine the angle of internal frictionfor this soil.(c) What is the probable condition of the testedsample (dense, loose, etc.)?
The table below contains data obtained from 2 CU triaxial tests on similar clay specimens. Specimen no. Cell pressure during consolidation (kPa) Deviatoric stress at failure (kPa) 269 Pore water pressure at failure (kPa) 264 400 379 1 2 462 689 Calculate the cohesion, c (kPa) of the clay soil in terms of total stress. Enter answer to 1 d.p. and don't enter units.
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.
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?
During the shearing phase of a CU test, the void ratio of a NC consolidated clay specimen will: 1decrease. 2could increase or decrease. 3remain a constant. 4increase.
5- The shear strength of a normally consolidated clay can be given by the equation tf o'tan 27°. Following are the results of a consolidated-undrained test on the clay. • Chamber-confining pressure = 3,130 lb/ft² Deviator stress at failure = 2,510 lb/ft² a) Determine the consolidated-undrained friction angle b) Pore-water pressure developed in the specimen at failure
Foundation: Direct Shear Test
Kindly answer all. If you can't answer all please leave it. Thank you