A silty clay was brought to the lab for DST testing. Three drained tests were conducted, with effective stresses = 20, 30 and 40 kPa. The critical state shear stresses measured were 29.5, 36.2, and 43 kPa, respectively. Calculate the effective friction angle of the silty clay. Express your answer in degrees

A silty clay was brought to the lab for DST testing. Three drained tests were conducted, with effective stresses = 20, 30 and 40 kPa. The critical state shear stresses measured were 29.5, 36.2, and 43 kPa, respectively. Calculate the effective friction angle of the silty clay. Express your answer in degrees

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter6: Vertical Stress Increase In Soil

Section: Chapter Questions

Problem 6.12P: Refer to Problem 6.1. Using Eqs. (6.3) and (6.29), estimate the average stress increase (Δσav) below...

See similar textbooks

Similar questions

The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer?
Refer to Problem 6.1. Using Eqs. (6.3) and (6.29), estimate the average stress increase (Δσav) below the center of the loaded area between depths of 3 m and 6 m. 6.1 A flexible circular area is subjected to a uniformly distributed load of 150kN/m2 (Figure 6.2). The diameter of the load area is 2 m. Determine the stress increase in a soil mass at points located 3 m below the loaded area at r = 0. 0.4 m, 0.8 m, and 1 m. Use Boussinesq’s solution. Figure 6.2 Increase in pressure under a uniformly loaded flexible circular area
A consolidated drained triaxial test was conducted on a granular soil. At failure (σ1^')/(σ3^' ) = 4.0. The effective minor principal stress at failure was 100 kN/m2. Compute the principal stress difference at failure in kPa. a. 100 b. 200 c. 300 d. 400 e. 500
A soil profile, under surcharge load of 25 kN/m2 at ground level, consists of 6m sand and 3m clay layer. Ground water table is 2m below sand layer. Dry unit weight and saturated unit weight of sand is 15.80kN/m3 and 16.90kN/m3 respectively. Clay layer, Gs=2.67 and saturated unit weight is 18.80 kN/m3. Determine a)Increase in stress at the mid layer of clay b) With dewatering 2m, what is the stress increase at the mid layer of clay c) How much must the water level be lowered to me more effective than the surcharged load?
Figure Q1(c) shows the soil profile with groundwater table is 6 m from thesurface impermeable layer. Calculate the total stress, pore water pressureand effectives tress at points D.
A consolidated drained tri-axial test was conducted on normally consolidated clay. The results were: the confining pressure is 300 kPa and the deviators stress is 300 kPa. Compute the angle of shearing resistance. a. 16.3 b. 54.74 c. 19.47 d. 24.72
Water flows at a rate of 0.09 m3/s upward through a sand sample with a coefficient of permeability of 27 cm/s. The thickness of the soil is 0.24 m and the area is 0.54 sq. m. Saturated unit weight is 18.9 kN/m3. a) Determine the hydraulic gradient (Ans. 0.617) b) Compute the effective stress at the middle of the sample (Ans. 354 N/m2) c) Compute the effective stress at the bottom of the sample. (Ans. 728 N/m2)
Subject : Geotechnical Engineering If you don't know the solution please leave it. The plan of a flexible rectangular loaded area is shown. The uniformly distributed load on the flexible area (q) is 400 kN/m^2. Determine the increase in the vertical stress at a depth of z = 1m, 2m, and 3m below.
Describe about the Stress Path for Tests in Consolidated–Drained Conditions.
A field vane shear test was conducted in saturated clay. The height and diameter of the vane were 101.6 mm and 50.8 mm respectively. During the test, the maximum torque applied was 0.0168 kN.m Determine the undrained shear strength of the clay?
A borehole. A clay layer is discovered 7m below a sandy soil. The groundwater table of the area is 10m below the natural grade line. The sandy soil has a unit weight of the clay layer is 22.3 kn/m3 , and the moisture content and specific gravity is 12.4% and 2.7, respectively. A. Find the driend unit weight of the clay layer B. Find the total stress on a point 13m below the natural grade line. C. The effective stress at a point 10m below the grade line. D. Find the effective stress 13m below the natural grade line if there is a ground water drawdown of 4.5m due to groundwater extraction
A consolidated drained tri-axial test was conducted on normally consolidated clay. The results were: the confining pressure is 300 kPa and the deviators stress is 300 kPa. Compute the angle that the failure plane makes with the major principal axis in degrees. show fbd a.16.3 b.24.72 c.54.74 d.19.47