Geotechnical Engineering 1 Jan 2014
2
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
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Transcript of Geotechnical Engineering 1 Jan 2014
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.20l4Geotechnical Engineering - I
4a.b.
c.
(Joo!a
()=o!
E9
de
-ooo rr
=*.=Nc0$
gilotri-O
o=
a:
oC,
b0c
a6
OE
lqorvoJ?.96:-rE!o .=Y,,^:co0o=o.BXoo
U<- o.l
0)
oz=oE
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. Drawco-effi
the grain size:ient of curvatt
distfibutione ofthe soil
curve andfor the follolclem 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 0.5c. 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 onewith 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)tPasSing 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 drops20 mm in 5 minutes. Calculate the time required for the head to fall to 250 mm? (06 Marks)
Panr - sDiscuss 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 beloatrons of a lr test are
Dry density kN/m' 16.16 17.06 18.61 18.95 18.78 17.t3Water 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:2.77condition. Take
(08 Marks)
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la.b.
c.
10cv54
a. Differentiate compaction from consolidation. (06 Marks)b. Explain the significance of pre-consolidation pressure. Describe the Casagrande method of
determining it. (08 Marks)c. A bed of compressible clay. 4 m thick has pervious sand on the top and impervious rock at
the bottom. In a consolidation test on an undisturbed sample of clay from this deposit, 907o
settlement was reached in 4 hours. The sample was 20 mm thick. Estimate the time in yearsfor the building founded over this deposit to reach 90% of its final settlement. (06 Marks)
Explain sensitivity and thixotscopy of clay. (06 Marks)Explain total, neutral and effective stresses in soil. What is the significance of effectivestresS? (06 Marks)The stresses on a failure plane in a drained test on a cohesionless soil are as under:
Normal,,ptres-s (o) : 100 kN/#Shear stress (r) :40 kN/m2(i) Determihe the angle of shearing resistance and the angle which the failure plane makes
with the majolprincipal plane.Also find the major"and minor principal stresses. (08 Marks)
a. What are the advantages and disadvantages of direcl shear test over triaxial test? (06 Marks)b. What are curve fitting methods used in consolidation test? Explain any one, with neat
sketches. (08 Marks;c. A shear vane of 75 mm diameter and I 10'mm length was used to measure the shear strength
of a soft clay. If a torque of 600 N-m was required to shear the soil, calculate the shearstrength. The vane was then rotated rapidly to cause remoulding of the soil. The torquerequired in the remoulded state was 200 N-m. Determine the sensitivity of the soil.
' , ' ' -',i :: (06 Marks)
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