Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 17, Problem 17.11P
To determine
Find the undrained shear strength of the clay.
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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…
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
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Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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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_forwardQ- 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_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_forward
- Following 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_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_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_forwardThe 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_forward
- 7.9 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_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_forwardProblem # 5. The angle of friction of compacted dry sand is 37°. In a direct shear test on the sand, normal stress of 150 kN/m^2 was applied. The size of the specimen was 50mm x 50mm 30 mm (height): a. Compute the shearing stress.b. What shear force will cause will cause shear failure?c. Determine the shear stress at a depth 3m. If the void ratio of the soil is 0.60. Sp. Gr. of sand is 2.70.arrow_forward
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