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eights was pressed into soft clay in a borehole. The torque was applied and gradually increased to 100 N-m w

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 10.18P

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a. A vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. Determine the undrained shear strength of the clay. b. The clay soil described in part (a) has a liquid limit of 58 and a plastic limit of 29. What would be the corrected undrained shear strength of the clay for design purposes? Use Bjerrum’s relationship for λ
a. A vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. Determine the undrained shear strength of the clay. b. The clay soil described in part (a) has a liquid limit of 58 and a plastic limit of 29. What would be the corrected undrained shear strength of the clay for design purposes? Use Bjerrum’s relationship for λ [Eq. (3.40a)].
A vane shear test was conducted in a saturated clay. The height and diameter of the rectangular vane were 4 in. and 2 in., respectively. During the test, the maximum torque applied was 230 lb-in. The clay soil has a undrained shear strength of 7.844 psi. It has a liquid limi of 58 and a plasic limi o 29. What would be the corrected undrained shear strength of the clay for design purposes? Using Bjerum's relationship for λ. λ = 1.7 - 0.54 log[PI(%)]
A temporary excavation shown below is braced with a steel tube strut. Every morning, a misguided foreman tightens the screw mechanism on the strut "just to be safe". The stress on a soil particle at point A, just behind the wall, has been measured with pressure sensor installed by the Engineer. It now measures 40KPa. If the potential failure planes in the soil behind the wall sustain 60 degrees angles with respect to the vertical wall, determine the normal stress at point A along potential failure plane.
An embankment load on a silty clay soil layer as shown below. Determine the stress increase under the embankment at points A and B that are loaded at a depth of 6 m below the ground surface. 5 m 1H:2V 1H:2V 1H:1V 8 m 13 y=18 kN/m Y=18 kN/m³ 6 m : B : A CS Scanned with CamScanner
Vane shear tests were conducted in the clay layer. The vane dimensions were 63.5 mm (D) x 127 mm (H). For the test at A, the torque required to cause failure was 0.051 Nm. For the clay, given: liquid limit = 46 and plastic limit = 21. (a) Estimate the undrained cohesion of the clay for use in the design by using Bjerrum's correction. A = 1.7 – 0.54 log[PI(%)] (b) Estimate the overconsolidation ratio of the clay. Use Eqations below. Cu(field) B- σο B = 22[PI(%)]-048 OCR %3| Dry sand y = 16.5 kN/m³ ·1.5 m Groundwater table Sand 1.5 m Ysat = 19 kN/m³ N60 5 :1.5 m • 8 Clay = 16.8 kN/m³ 1.5 m Ysat * A • 8 1.5 m • 9 1.5 m 10 Sand
A 60 cm Cl main pipe leads from a reservoir whose water surface is at Elev. 1590 m. Below the ground surface level, the main pipe is horizontally positioned at Elev. 1410 m. Assuming static condition, what is the stress in the pipewall if the wall thickness is 12.50 mm and the soil pressure is 520 kPa? a. 18.2 MPa O b. 20.5 MPa O . 28.7 MPa O d. 32.6 MPa
Refer to Figure P3.3. Vane shear tests were conducted in theclay layer. The vane (tapered) dimensions were 63.5 mm(d) 3 127 mm (h), iB 5 iT 5 458 (see Figure 3.23). For the test at A, the torque required to cause failure was 51 N ? m.For the clay, given: liquid limit 5 46 and plastic limit 5 21.Estimate the undrainedcohesion of the clay for use in thedesign by usingBjerrum’s l relationship
CEN-333 Geotechnical
The cross-sectional area of bar ABCD is 500 mm^2 . Determine the stress in segment BC
A hollow shaft transmits 15 MW at 400 rev / m * i * n . It is supposed that the maximum allowable stress is not to exceed 70 MN/m2 nor the angle per metre of twist 0.4 degree length of shafting. If the outside diameter of the shaft is 400 mm find the minimum thickness of the hollow shaft to satisfy the above conditions. G = 80 GN/m2. *