EGB373-TUT 11-Week 12 - Shear Strength of Soils -3 - Answers-Gray

Two sub-basins in a catchment have been earmarked for settling displaced persons. The rainfall characteristics typical of the watershed is presented as follows: Typical Rainstorm Time from start (mins) 0-15 15-30 Rainfall depth (mm) 2.5 3.5 4.0 30-45 45-60 3.2 60-75 5.0 75-90 3.5 Sub-basin characteristics Sub-basin characteristics Flow length Average slope (%) % Silt % Clay Soil Structure Permeability Land-use Organic Matter Content Very fine sand P-Factor Sub basin A Sub-basin B 300 m 200 m 3 4 60 50 20 30 Coarse granular Fine granular moderate Arable 2% 10 0.1 Fine granular Established grass 3% 5 0.15 Catchment A is arable with C-factor of 0.2. The rainfall erosivity index is computed as R = El 30/100. Determine the following; (i) (ii) Compute the Weischmeier index using the Weischemeier equation. KE 11.87+8.73 Which of the two catchments are at risk of degradation by erosion if it were to be used to settle the displaced persons if the C-factor for settlement is 0.3? The permissible…

You have been given the following set of data from a soil-geotextile friction test:   Normal stress (kPa) Peak shear strength (kPa) Residual shear strength (kPa) 17 20.2 13 35 31 22 70 52 39.5 140 94 74.5   (a) Plot the Mohr-Coulomb failure envelope (x-axis=normal stress; y-axis=shear stress) (b) Determine the peak friction angle,  and the residual friction angle, . (c) Determine the peak adhesion and the residual adhesion. (d) Calculate the fabric efficiency based on a soil friction angle of  = 35-degrees using the peak friction angle.   **HINT: the equation for efficiency of soil friction angle mobilization is:

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In the graph, the module of toughness can be shown to be represented by: A) The area associated with necking B) The rectangular area label yielding C) The triangular area in the elastic region D) The sum of the entire shaded area under the curve

Which among the metals below is the most elastic? Rank them from least to most elastic. Why is steel the better metal to use in building construction than nickel? Modulus of Elasticity 10 psi Shear Modulus Metal Alloy 10 psi GPa GPa Aluminum 69 10 25 3.6 Brass 97 14 37 5.4 Copper 110 16 46 6.7 Magnesium 45 6.5 17 2.5 Nickel 207 30 76 11.0 Steel 207 30 83 12.0 Titanium 107 15.5 45 6.5 Tungsten 407 59 160 23.2

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Graph the following data on a stress-strain curve. Identify/Determine the following: Elastic Limit, Plastic Limit, Proportional Limit, Upper Yield Point, Lower Yield Point, Ultimate Strength, Rupture Strength, and Modulus of Elasticity. Engr. True Stress Strain o, MPa 102.3 0.00050 204.7 0.00102 293.5 0.00146 272.9 0.00230 264.0 0.00310 268.9 0.00500 267.6 0.00700 264.0 0.01000 318.6 0.0490 372.0 0.1250 394.4 0.2180 395.0 0.2340 384.2 0.3060 360.4 0.3300 327.5 0.3480 290.0 0.3600 266.8 0.3660