Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Question
Chapter 17, Problem 17.11P
To determine
Find the undrained shear strength of the clay.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
12.12 Following are the results of consolidated-undrained triaxial tests on undisturbed
soils retrieved from a 4-m-thick saturated clay layer in the field (ysat = 19 kN/m³).
a. Estimate graphically the Mohr–Coulomb shear strength parameters c' and ø'.
b. Estimate the shear strength in the middle of the clay layer.
Chamber
Deviator stress,
pressure, o3
(kN/m?)
(Ar),
(kN/m?)
Pore pressure at
failure, (Aud,
(kN/m?)
Test no.
1
100
170
-15
200
260
-40
3
300
360
-80
© Cengage Learning 2014
A saturated specimen of cohesionless sand was tested under drained conditions in a triaxial compression test apparatus and the sample failed at a deviator stress of 482 kN/m2 and the plane of failure made an angle of 60° with the horizontal. Find the magnitude of the principal minor stress in kPa at failure for identical specimen of sand if it is tested under a cell pressure of 200 kPa.
a.600
b.241
c.723
d.200
1. A direct shear test was conducted on a specimen of dry sand with a normal stress of 200
kN/m?. Failure occurred at a shear stress of 175 kN/m?. The size of specimen tested was
75mmx75mmx30mm. For a normal stress of 150 kN/m², what shear force would be required
to cause failure of specimen?
2. A cut slope was excavated in sand. The slope is shown in following figure.
18m
0.*
5 m
14m
30°
To find the properties of the sand, representative samples were taken for the soil and tested in a
triaxial apparatus. A consolidated drained triaxial test was conducted. The result is given below:
Chamber pressure = 103 kN/m?
Deviator stress at failure = 234.6 kN/m?
We know the unit weight of the sand is 16 kN/m³.
Use the ordinary method of slices (use 7 slices) and estimate the factor of safety against sliding for
shown slip surface and comment on the calculated factor of safety.
Please note that:
1. The figure is not in scale. You may resketch it in scale and calculate the factor of safety
2. The…
Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Knowledge Booster
Similar questions
- A saturated specimen of cohesionless sand was tested under drained conditions in a triaxial compression test apparatus and the sample failed at a deviator stress of 482 kN/m2 and the plane of failure made an angle of 60° with the horizontal. Find the magnitude of the principal minor stress in kPa. include diagramarrow_forwardIn a drained triaxial compression test conducted on dry sand, failure occurred when the deviator stress was 238kN/m² at a confining pressure of 69kN/m². What is the effective angle of shearing resistance and the inclination of failure plane to major principal plane?arrow_forwardFollowing data are given for a direct shear test conducted on dry silty sand:Specimen dimensions: diameter = 71 mm; height = 25 mmNormal stress: 150 kN/m2Shear force at failure: 276 Narrow_forward
- Q- An undrained triaxial compression test is carried out on a saturated clay sample under a cell pressure of 50 kN/m². The sample failed at a deviator stress of 100 kN/m². Find the cohesion of this clay sample.arrow_forwardA saturated specimen of cohesionless sand was tested under drained conditions in a triaxial compression test apparatus and the sample failed at a deviator stress of 482 kN/m2 and the plane of failure made an angle of 60° with the horizontal. Find the magnitude of the principal major stress in kPa.arrow_forwardIn a site consisting entirely of clays, an electric friction conepenetrometer measures the cone resistance qc at a depth of8.0 m as 0.75 MN/m2. The water table is at 3.0 m below theground level. The unit weights of the clay above and belowthe water table are 16.5 kN/m3 and 19.0 kN/m3, respectively.Estimate the undrained shear strength, preconsolidationpressure, and overconsolidation ratio at this depth.arrow_forward
- Q-5 c, An undrained triaxial compression test is carried out on a saturated clay sample under a cell pressure of 50 kN/m². The sample failed at a deviator stress of 100 kN/m². Find the cohesion of this clay sample.arrow_forward7.9 A specimen of soil was collected from a depth of 12 m in a deposit of clay. The ground water table coincides with the ground surface. For the soil, LL= 68, PL = 29, and Ysat = 17.8 kN/m'. Estimate the undrained shear strength S of this clay for the following cases. (a) If the clay is normally consolidated. (b) If the preconsolidation pressure is 191kN/m².arrow_forward3.25 In a site consisting entirely of clays, an electric friction cone penetrometer measures the cone resistance q, at a depth of 8.0 m as 0.75 MN/m2. The water table is at 3.0 m below the ground level. The unit weights of the clay above and below the water table are 16.5 kN/m3 and 19.0 kN/m2, respectively. Estimate the undrained shear strength, preconsolidation pressure, and overconsolidation ratio at this depth.arrow_forward
- The following test results at failure conditions are obtained from consolidated undrained triaxial tests on samples from a saturated clay strata. u 03 (pore water (kg/cm²) (kg/cm?) pressure kg/cm? ) Specimen 1 Specimen 2 Determine shear strength parameters. 2.75 1.50 1.50 4.25 2.20 2.0arrow_forwardA clear dry sand sample is tested in a dire shear test. Thee normal stress and the shear stres at failure are both equal to 120 kN/m2. The angle of shearing resistance of the sand will be (a) 25° (c) 45° (b) 35° (d) 55°arrow_forwardA 42mm-diameter intact rock specimen fails in a uniaxial compression test at an axial load of 20 kN. The rock behaves according to the Mohr-Coulomb criterion, with an angle of friction 38 degrees found in the triaxial tests. A specimen of diameter 42mm would fail in a triaxial test with the confining pressure of 10MPa. The values of ??and m in the Hoek-Brown criterion that would give the same failure loads as the Mohr-Coulomb criterion, for the uniaxial and triaxial tests referred to above is respectively ?? 75.14MPa and m 7.76. Calculate by how many percent the Hoek-Brown criterion with ??and m as determined in (c) overestimates or underestimates the axial load at failure compared to Mohr-Coulomb criterion, when the confining pressure is 10MPa and when it is 20MPa.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781337705028Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage Learning
Principles of Foundation Engineering (MindTap Cou...
Civil Engineering
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Cengage Learning