What are the purposes of the soil classification?
[3 marks]Define: Flow line and Equipotential line. Also state the characteristics of flow net.
[4 marks]A 400 gm of soil gives following data on performing dry sieve analysis: Sieve 4.75 2.36 1.18 0.600 0.425 0.300 Size, mm Weight 8 12 32 75 64 70 retainer on each sieve, gms Sieve 0.212 0.150 0.075 Receiver Size, mm Weight 65 42 20 retained on each sieve, gms Plot ‘Grain Size Distribution Curve’
[12 marks]1 m3 of wet soil having weight 22 kN, when it dries, it becomes 19.5 kN. If specific gravity of soil is 2.62, determine void ratio in soil.
[3 marks]Define: Normally Consolidated Clay and Over Consolidated Clay with neat sketch.
[4 marks]Aretaining structure of 4m height is supporting a cohesionless backfill (angle of internal friction as 30° and bulk unit weight as 22kN/m3 ) inclined at an angle of 10° with horizontal. Determine Rankine’s total passive force per meter length of the wall.
[7 marks]Aspecimen of dry, cohesionless sand is tested in shear box and the soil failed at a shear stress of 9 kN/m2 and normal stress of 18kN/m2 . Determine: (i) angle of internal friction and (ii) the magnitude of major and minor principal stress during failure.1
[7 marks]Define the following terms: (i) porosity (ii) Air content (iii) Bulk Unit weight
[3 marks]The following results were obtained from a standard proctor test on a sample of soil: Water 15 16 17 18 19 content, % Mass of 1.5 1.62 1.68 1.65 1.65 1.63 Wet soil, kg The volume of mold is 950cc. Make necessary calculations and plot the ‘compaction curve’.
[20 marks]Define with sketch Flow net. Its characteristics and its application.
[7 marks]Define Safe, Allowable and Ultimate bearing capacity of soil.
[3 marks]Determine time t, in minutes, for a particle of diameter 0.006mm to fall a height of 10cm from the surface of water. Take μ = 0.00815 poise and G = 2.66
[4 marks]What is the difference between superficial velocity and seepage velocity?
[7 marks]Asample of saturated soil collected from core-cutter has a water content of 30% and saturated unit weight of 22 kN/m3 , determine specific gravity of soil. (Take γ = 9.81 kN/m3 .) w
[3 marks]Determine Cand Cfor the soil sample with below data. D60 = 0.81 mm, u c D30 = 0.37 mm and D10 = 0.35 mm. Decide the type of soil; well graded or poorly graded
[4 marks]Aclay layer 4m thick is subjected to a pressure of 60 kN/m2 over a large area. If the layer has double drainage and undergoes 60% consolidation in one year, determine the co-efficient of consolidation. If the co-efficient of permeability is 0.003m/year, determine the settlement in one year.
[7 marks]Explain the phase diagram for a soil.
[3 marks]Explain in brief: tri-axial compression test for UU condition.
[4 marks]An infinite slope is made of clay with the following properties, γ =18 bulk kN/m3 , γ = 9 kN/m3 , C’=25 kN/m2, φ’=28° If the slope has an sub inclination of 35° and height equal to 12 m, determine the stability of slope, (i) when the slope is submerged (ii) there is seepage parallel to the slope.
[7 marks]What are different factors of safety used in the stability of slopes? Discuss briefly.
[3 marks]Explain the following terms 1. Isochrone 2. Secondary Compression
[4 marks]Differentiate between General shear failure and Local shear failure with neat sketch.
[7 marks]Explain factors affecting permeability of soils
[3 marks]The maximum dry density of a sample by the light compaction test is 1.8 gm/cc at an optimum moisture content of 18%. Find the degree of saturation. What would be the corresponding value of dry density on the ‘zero air void line’ at optimum moisture content? Take G=2.67.
[4 marks]Differentiate between the process of consolidation and compaction.
[7 marks]