USN Time: 3 hrs. N ot e : A n s w e r F {{r' {:Nf,:;:' f;il'"::: ;' frr,, PART _ A 1 a. 'With the help of soil tluee-phase diagram explain: (i) Water content (iii) Degree of saturation (iv) Relative density b. With usual notations, derive the relationship Ta= (1- n" )Gy, I +roG 10cv54 Max. Marks:100 Fifth Semester B.E. f)egree Examination, Dec.2013 /Jan.20l4 Geotechnical Engineering - I 4a. b. c. (J o o ! a () = o ! E9 de -o oo rr =* .=N c0$ gil otri -O o= a: oC, b0c a6 OE lq orv oJ ?.9 6: -rE !o .= Y,, ^: co0 o= o.B Xo o U< - o.l 0) o z = o E c. A fully saturated soil sample has a water content of 35o/o and specific gravity of 2-65. Determine its porosity, saturated unit weight and dry unit weight. (06 Marks) a. Define : (i) Liquid limit (ii) Shrinkage limit (iii) Relative consistency (iv) Shrinkage ratio. (ii) Air content (08 Marks) (06 Marks) (08 Marks) determine the uniformity co-efficient and ing data: (08 Marks) b. Draw co-effi the grain size :ient of curvatt distfibution e ofthe soil curve and for the follo lclem Or C ure o soll, w Sieve size (mm) 2.4 1.2 0.6 0_3 0.15 0.075 Pan Mass of soil retained (g) 0 5 25 215 225 25 0.5 c. A soil has a plastic limit of 25oh and a plasticity index of 30o/o.If the natural water content of 3a. b. c. 5a. b. c. the soil is 34o/o, determine its consistency index and liquidity index. (04 Marks) Explain field identification of soils. (08 Marks) What are the different types of clay minerals commonly found in soils? Explain any one with their structure. (06 Marks) Classify the following soils with IS system of classification: Soil A : Liquid limit : 38% and Plastic limit:20o/o ,/ Soil B : Liquid limit : 18% and Plastic limir: l2oh fS", Soil C : Passing through 4.75 mmIS sieve :70o/o /6, ' -.,q{q; Tr is", u)t PasSing through 0.075 mm IS sieve : 08o% 1l![ ce[.6]'s" ]." ilf;: 3.":f:';#rp: 3 /u \1io\-'t**' ,lr!,1 (06 Marks) .\__-4 ., -8 6 11,ui:f)- Explain the factors affecting permeability. '\{t i,4q9-' (08 Marks) Explain Quick Sand phenomenon. (06 Marks) In a falling head permeability test, head causing flow was initially 500 mm and it drops 20 mm in 5 minutes. Calculate the time required for the head to fall to 250 mm? (06 Marks) Panr - s Discuss the effect of compaction on different properties of soil. (08 Marks) Differentiate between standard and modified proctor tests. (04 Marks) The observations of a standard iven belo atrons of a lr test are Dry density kN/m' 16.16 17.06 18.61 18.95 18.78 17.t3 Water content (%o) 5.02 8.81 11.25 13.0s 14.40 19.25 (i) Plot the compaction curve and determine optimum moisture content. (ii) Also compute the void-ratio and degree of saturation at optimum G:2.77 condition. Take (08 Marks) For More Question Papers Visit - www.pediawikiblog.com For More Question Papers Visit - www.pediawikiblog.com www.pediawikiblog.com