CE 343 Homework No. 8 Soil Mechanics questions

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I need you to do these 4 soil mechanics questions.

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CE 343 Soil Mechanics Homework No. 8 (Due on Thursday, March 28) 1. A soil profile consisting of three layers is shown in the figure below. Characteristics of each soil layer are also given in the figure. (a) Calculate the values of total vertical stress σ, pore water pressure μ, and effective vertical stress σˈ at points A, B, C, and D. (b) Plot the variation of σ, μ, and σˈ with depth. (c) The groundwater table dropped by 6 ft due to overpumping groundwater. What is the change in effective stress at point C because of the change of groundwater table? 7 ft 12 ft 6 ft γd = 110 lb/ft3 e=0.7; Gs=2.7 γsat = 118 lb/ft3 Gravel Coarse Sand Clay Bed Rock 2. Assume the soil in the figures below has a saturated density of 18.52 kN/m3. Unit weight of water is 9.81 kN/m3. Compute σ, μ, and σˈ at the bottom of the soil sample for: (a) Case I; (b) Case II; (c) Case III. h3=1 m h1=1 m h11=1mm h2=3 m mm h32=3 Case I Case II h1=1 m h2=3 m Case III 3. The foundation soil at the toe of an earthen dam has a porosity of 38% and a unit weight of solids, γs of 26.78 kN/m3. To assure safety against piping (underground channel caused by soil migration under a high hydraulic gradient), the specifications state that the upward hydraulic gradient i must not exceed 30% of the critical gradient ic. What is the maximum permissible upward hydraulic gradient? 4. An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and Gs = 2.68. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 6 m above the top of sand layer. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves.
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Hi, here is your assignment :). On part 1 and part 3, I do it in hand written solution because I have to draw the figure to support the solution :).. Goodluck :).. And hope to work with you again in future :)

CE 343 Soil Mechanics Homework No. 8 (Due on Thursday, March 28)
1. A soil profile consisting of three layers is shown in the figure below. Characteristics of each
soil layer are also given in the figure. (a) Calculate the values of total vertical stress σ, pore
water pressure μ, and effective vertical stress σˈ at points A, B, C, and D. (b) Plot the variation
of σ, μ, and σˈ with depth. (c) The groundwater table dropped by 6 ft due to over pumping
groundwater. What is the change in ...


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