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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For the fully saturated clay layer depicted below, calculate the undrained shear strength in kPa of the clay layer if the factor of safety against failure is equal to 1.2 for short-term stability. Hint: use a simplified chart-based approach.
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 diagram
In 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.
Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- In Problem 16.3, if there was a surcharge of 20 kN/m2 at the ground level, what would be the total horizontal normal stresses at A and B? Use the results from Problem 16.3. 16.3 The soil profile at a site is shown Figure P16.3. Find the total horizontal normal stresses at A and B, assuming at-rest conditions.arrow_forwardQ.4 A 40° slope is excavated to a depth of 8 m in a deep layer of saturated clay having strength parameters c = 60 kN/m2 , Ø = 0, and ɣ = 19 kN/m3 . Determine the factor of safety for the trial failure surface shown in Fig. 4arrow_forwardA vane shear test was conducted in a saturated soft clay,using a 100 mm 3 200 mm vane. When the vane was rotatedat the standard rate of 0.1°/s, the torque measured inthe torque meter increased to 60 N ? m, and with further rotationreduced to 35 N ? m. Determine the peak and residualundrained shear strengths of the clay.arrow_forward
- An embankment consists of clay fill for which c′ = 25 kN/m2 and φ = 27° (from consolidated undrained tests with pore-pressure measurement). The average bulk unit-weight of the fill is 2 Mg/m3. Estimate the shear-strength in kPa of the material on a horizontal plane at a point 20 m below the surface of the embankment, if the pore pressure at this point is 180 kN/m2 as shown by a piezometer.arrow_forwardIf the shear modulus of the material along the plane is 3x10^10 Pa, area of the fault plane is 270m^2, and the average displacement of the fault rupture is 2.1m, determine the seismic moment and the moment magnitude of the earthquake.arrow_forwardDetermine the magnitude (Mw) of an earthquake resulting from a fault having a rapture length of 175km and width of 12km .The slip was found to be 2m .Take shear modulus of the rock is 3*10^10N/m^2 .Also compute its energy with a magnitude : 6 eventarrow_forward
- Two vanes A and B, with length-to-diameter ratios of 3 and 1 respectively, are each used to make a test at the depth in a clay layer. Both vanes have a diameter of 50 mm and the torque values measured were 95 N-m for A and 45 N-m for B. Find the values of undrained shear strength on the horizontal and vertical planes at this depth. Explain why undrained strength in clays may vary with direction.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_forwardFor the given problem, the failure plane was inclined at an angle of 35° with the vertical to find the cohesion of the soil for an unconfined cylindrical specimen of clay fails under an stress of 240kN/m^2arrow_forward
- A 16-m thick soil has water table 4 m. below the ground surface. The soil has a void ratio of 0.42 and specific gravity of 2.62. Above the water table, the soil has a degree of saturation equal to 49.96%. Direct shear test conducted on the soil shows that the an angle of internal friction of 24.25° and cohesion of 15.13 kPa. What is the potential shear strength (in kPa) on a horizontal plane at a depth of 8 m. below the ground surface? Round off to two decimal places.arrow_forwardIn a drained triaxial compression test, a saturated specimen of cohesionless sand fails at a deviator stress of 450 kN/m2 when the cell pressure was 135 kN/m2. Find the angle of inclination of the failure plane with the horizontal. Show diagramarrow_forwardIn a field vane shear test, a 150-mm long and 75-mm wide vane is pressed into a soft clay at the bottom of a borehole. If the clay fails at a torque of 50 Nm, determine the shear strength of the clay?arrow_forward
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