b- Determine the minimum FOS for cu-65 kPa, ou-0, y-19 kN/m³ if slope angle is 45° and no hard stratum exists below the slope. the slin mass into a number
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- a. Briefly explain why short-term undrained conditions are the most critical case for the filledge slope stability.b. Figure 3 shows the approximate existing soil layer profile along the cross section B-B’. Italso shows the proposed location of the fill layer and the edge slope. Divide the clay layer,FM1, into sublayers for the slope stability analysis. Assign total stress strength parametersto each sub-layer. Indicate on the soil profile sketch the locations of your clay sublayerboundaries, and the assumed shear strength for each sublayer. Assign the appropriatestrength to the fill layer. c. Evaluate the stability of the fill embankment as if it were installed all at once. Do this bylocating a reasonable circle center for a rotational sliding surface. Locate the circle so that thebottom is tangent to a horizontal line at the mid-depth of the soft clay layer. What is the factorof safety for this surface? Sketch your answer on a cross section through the embankment andfoundation,…The results of 4 drained direct shear tests of an over-consolidated clay are as followsDetermine the cohesion and angle of internal friction of the clay. Please answer this asap. For upvote. Thank you very much.The results of a three consolidated undrained tri-axial test on saturated clay are as follows: Compute the angle of internal friction a. 15.03 degreesb. 12.06 degreesc. 18.40 degreesd. 31.05 degrees
- Answer Q13 to Q 15 based on following description A cutting in a saturated clay is inclined at a slope 1 vert:1.2 horizontal and has a vertical height of 10.0 m. The bulk unit weight of the soil is 18 kN/m³ and its undrained cohesion is 35 kN/m³. Undrained friction angle, -0. Area of slip mass = 51.2 m², d= 7 m r=12m 2m 1 W 10m FoS of a slope along a circular slip surface is given by; cular F = Wd Calculate the arc length along the slip surface, La a-964.8 m O b. 16.8 m O c. 114.0 m O d. 8.4 m d=5m 1.2PROBLEM 1: A BOREHOLE ATA SITE REVEAL THE SOIL PROFILE SHOWN IN FI6URE. DETERMINE THE TDIAL AND EFFECTIVE STRESSES AT ELEVATION 2D 00m 2.0m 3.0m VERY FINE SAND W= 5%., S: 40 /. FINE SAND W : 12., S-80/. FINE SAND W : 121. 5.4m SDFT CLA Y, W- 28 FDR ALL SDIL USE GS 2.7 20. LomPlz, answer all the parts have been asked in this question Geotechnical Engineering-2 Question-1: a. A fill load is applied on ground surface. WT being on the ground surface, describe the variation of porewater pressure and effective vertical stress with time for an element of soil at depth z and locate excess pore water pressure on the curve. b. Explain in-situ correction to e-logo' curve for Overconsolidated clay, with the help of diagram only c. Discuss the theorectical curve of U Vs log(Tv) with experimental curve of dial readings Vs log(t) from Oedometer Test.
- Scenario The wall footing at right is to be constructed to carry an inclined load at 85 degrees with the horizontal, as shown. Assume that there is impenetrable bedrock below the Sample point shown in the figure. Question #1: Calculate the expected primary settlement of the soil at the Sample point. Also, determine the time it will take for 60% of the expected primary settlement to occur. 2.5 m 0.5 m 120 kN/m 2 m y = 17.7 kN/m³ • Sample Cc = 0.190 Cv = 0.5 cm²/day eo = 0.83 Silty clay Question #2: Determine the factor of safety against bearing failure of the soil for the wall footing if qult of the soil is 160 kN/m².A consolidated-drained triaxial test was conducted on a normally consolidated clay. Theresults are, Ϭ3 = 300 kN/m2, (ΔϬd)f = 250 kN/m2. Determine? Draw a neat Mohr Circle to aconvenient scale and determine following?a. Angle of friction ϕ’?b. Derive a relation between angle Ѳ (that the failure plane makes with the majorprincipal plane) and internal friction angle of soil (ϕ’)? Also find out the failure planeangle (Ѳ) in this case?c. Find the normal stress Ϭ’ and the shear stress Ƭ on the failure plane?d. Determine the effective normal stress on the plane of maximum shear stress andorientation of this plane?e. Determine the orientation of both major and minor principal planes?3500 kN 3 m x 3 m 0.6 m Ya = 17.5 kN/m³ Sand 0.6 m GWT Sand Ysat = 18.3 kN/m3 1.2 m Y sat = 17.1 kN/m³ C, = 0.06 Clay 1.2 m e, = 1.4 Cc = 0.38 %3D
- 2. The following laboratory data are available on the drained shear strength of a highly overconsolidated stiff clay at an effective normal stress range near 100 kPa: peak strength, c' = 10 kPa, o' = 22°; fully softened strength, c' = 0, ' = 21°; residual strength, c' = 0, o; = 12°. Factor of safety for slope stability analysis is defined as F.S. = (mobilized shear strength)/(shear stress). For one segment of a slip surface in a slope, the effective normal stress is 100 kPa and the factor of safety (for the segment) with respect to peak strength is 1.7. For the same segment compute: (a) F.S. with respect to the fully softened strength; (b) F.S. with respect to residual strength; (c) if the F.S. of the segment in part (b) also represented the F.S. of the whole slope, would you consider the slope to be stable or unstable?; (d) describe a method that could be used to improve the stability of the slope without making any %3D %3D %3D excavations.1. A granite rock formation consists of three sets of discontinuities where the average joint spacing is 320 mm. The RQD of the rock cores obtained from the boreholes is 68%. The joint surfaces are rough, stepped and unweathered, with no separation. The average uniaxial compressive strength of the intact rock cores is 200 MPa. The surface of excavation is found to be damp. Determine the RMR value, disregarding the rating adjustment for discontinuity orientation. What values would you use for cohesion and friction angle in analysis of the rock mass?If a soil has a Swell Factor of 1.5, then 10 m3 of banked soil when excavated will have 15 m3 in the loose state.a) TRUEb) FALSE