Horizontal The stresses shown in the figure are applied at a point in a dry clayey...
The figure shows an element of soil at the interface between two dry sand layers on a a-32° slope The interface is d=7 m below the ground surface and ror both sand layers the friction angle is φ=30, and Ko= 0.41 Assume that the shear stress is zero on both the vertical and horizontal planes. Va1 (dry unit weight of sand layer 1) - 19 kN/m3 Ys2 (dry unit weight of sand layer 2) 20 kN/m Dry Sand (Yai Dry...
(10 points) The major and minor principal stresses measured in a soil element are equal to 200 and 100 kPa, respectively. The soil is a dry sand with an internal friction angle of 32 degrees and a cohesion intercept of zero, when the soil will be loaded, additional compressive stress increments of ơs and ơs/4 will be superimposed on σι and σ, respectively. Determine the maximum possible value of ơs such that the shear strength will not be exceeded in...
The state of stress within the soil below the ground surface is σ.-28 kPa, σ,-14 kPa, and t-4 kPa on the horizontal plane. Using Mohr's circle; a) Find the magnitude and directions of the major and minor principal stresses, that is the plane on which there are no shear stresses. b) If the material is a loose sand with a known friction angle of p-30 degrees and c'-0, construct the Coulomb failure envelope and determine if this soil is in...
Problems 39 ist four major factors that influence the internal friction angle of cohesionless soils 7-2 Define soil sensitivity and thixotropy In a direct shear test on a loose sand, a shearing stress of 36.1 kPa was recorded 7-3 while the normal stress on the failure plane was 66.4 kPa. (a) What are the shear strength parameters, c', φ'? (b) Find the major and minor principal stresses at failure. (c) Determine the shear strength at a normal stress of 110.0...
A site is underlain by two layers of normally consolidated clayey sand. The unit weights of the top layer are 19 and 21 kN/m3 and the layer is 6 meters thick. The unit weights of the bottom layer are 20 and 22 kN/m3 and the layer is 8 meters thick. Below the bottom layer lies bedrock. The water table is located 2 meters below the ground surface. The top layer soil has an effective stress friction angle of 38 degrees,...
Following data are given for a direct shear test conducted on dry sility sand: Specimen dimensions: diameter 71 mm; height 25 mm Normal stress: 150 kN/m2 Shear force at failure: 276 N a. Determine the angle of friction, ф. b. For a normal stress of 200 kN/m2, what shear force is required to cause failure? Das Problem 12.1 Also draw the Mohr's circle at failure. (c) What are the principal stresses at failure? (d) What is the inclination of the...
5, A soil element inside a 20° natural soil slope carries total vertical stress (%) of 140 kPa, total horizontal stress (on) of 80 kPa and shear stress (Tvh) of 15 kPa Canticlockwise shear stress on vertical plane). The pore-water pressure (u) inside the element is 30 kPa. The critical state angle of friction of the soil is 30o and its undrained shear strength is 40 kPa. (a) Draw the Mohr's stress circles for this element in terms of total...
Question 1: A point within an embankment slope has vertical normal stress (o) of 100 kPa, a horizontal normal stress (ox) of 60 kPa, and a horizontal shear stress (Txy) of 20 kPa. (a) Determine the major and minor principle stresses (b) Determine the orientation of the major principle stress (in degrees from vertical, clockwise or counterclockwise) Question 2: A point within an embankment slope of sand has a total vertical normal stress (σ) of 100 kPa, a total horizontal...
4. Shear Strength A sample of cohesive soil with undrained shear strength of 30 Kpa is beng tested in a triaxial est with a confining pressure of 15 Kpa (see the figure below). Sketch the failure envelope and Mohr's circle representing the state of stress at failure. Evaluate the following: (i) The vertical axial stress at failure. (ii) The major and minor principal stresses at failure (ii) The orientation of failure plane with respect to horizontal plane. (iv) The normal...
2. (10 points) A sample of sand is sheared in the following manner. First an all around normal stresso 350 kPa is applied to the sample. Next a shear stress is applied to the horizontal pia while the normal stress remains constant. The shear stresses at failure are + 186 kPa. Ihe initial stress and stress condition at failure are shown below 350 kPa 350 kPa 186 kPa 350 kPa 350 kPa ー550 kPa 550 kPa 186 kPa 350 kPa...