Toc H INSTITUTE OF SCIENCE & TECHNOLOGY, ARAKKUNNAM DEPARTMENT
j j j j j j j j j
OF CIVIL ENGINEERING
j j
QUESTION BANK j
IV SEMESTER
j
CE208– GEOTECHNICAL ENGINEERING I
j j jj
BASEDj ON
A P J ABDUL KALAM TECHNOLOGICAL UNIVERSITY SYLLABUS
j j j j j j j
2015jADMISSION
AcademicjYearj2017jPrepar
edjbyjAsst.Prof.AnniejJoy
, MODULEj –I
SYLLABUS
• Introductionjtojsoiljmechanicsj-MajorjsoiljdepositsjofjIndia
• Basicjsoiljpropertiesj-
jVoidjratio,jporosity,jdegreejofjsaturation,jairjcontent,jpercentagejairjvoids,jmoisturejc
ontent,jspecificjgravity,junitjweightj-jRelationshipjbetweenjbasicjsoiljproperties
• Sensitivityj–jThixotropyj-j numericaljproblems
Semesterj Examj Marksj %j -15
TWOj MARKSj QUESTIONS
1. NamejthejfatherjofjSoiljMechanicsjandjDefinejSoiljmechanics.jDr.
KarljVonjTerzaghijisjthejfatherjofjSoiljMechanicsj.
Soiljmechanicsjisjdefinedjasjthejapplicationjofjthejlawsjandjprinciplesjofjmechanicsjan
djhydraulicsjtojengineeringjproblemsjdealingjwithjsoiljasjanjengineeringjmaterial.
2. Definejdegreejofjsaturationjandjporosity.
‘Degreejofjsaturation’jofjajsoiljmassjisjdefinedjasjthejratiojofjthejvolumejofjwaterjinjthej
voidsjtojthejvolumejofjvoids.
‘Porosity’jofjajsoiljmassjisjthejratiojofjthejvolumejofjvoidsjtojthejtotaljvolumejofjthejsoilj
mass.
3. Drawjthejphasejdiagramjforjcompletelyjdryjandjfullyjsaturatedjsoiljmass.
(a)jfullyjsaturatedjsoiljmassj(b)jcompletelyjdryjsoiljmass
4. Differentiatejbetweenj‘residual’jandj‘transported’jsoils.
Soilsjwhichjarejformedjbyjweatheringjofjrocksjandjwhichjremainjinjpositionjatjthejplac
ejofjtheirjoriginjarej‘ResidualjSoils’.
Soilsjthatjgetjtransportedjfromjthejplacejofjoriginjbyjvariousjagenciesjsuchjasjwind,jwat
er,jice,jgravity,jetc.jarejtermedjas‘‘Transportedjsoil’’.
5. Definejspecificjgravity.
Thejspecificjgravityjofjajsubstancejisjdefinedjasjthejratiojofjitsjmassjinjairjtojthejmassjofja
njequaljvolumejofjwaterjatjreferencejtemperature,j4j°C.
G=γs/γw
, 6. Sketchjthejphasejdiagramjforjajsoiljandjindicatejthejvolumesjandjweightsjofjthejphas
esjonjit.
7. Definej‘Voidjratio’jandj‘Waterjcontent’.
‘Voidjratio’jofjajsoiljmassjisjdefinedjasjthejratiojofjthejvolumejofjvoidsjtojthejvolumejofjsol
idsjinjthejsoiljmass.
‘Waterjcontent’jorj‘Moisturejcontent’jofjajsoiljmassjisjdefinedjasjthejratiojofjthejweightjofj
waterjtojthejweightjofjsolidsj(dryjweight)jofjthejsoiljmass.
8.
THREEj MARKSj QUESTIONS
1. Ifjthejvolumejofjvoidsjisjequaljtojthejvolumejofjsolidsjinjajgivenjsoiljsample,jFindjVoidjra
tiojandjporosity.
IfjVv=Vs,thenjvoidjratioje=jVv/Vsj=1jHen
ce,porosityjn=e/(1+e)=1/2=0.5
2. Usingjphasejdiagram,jderivejthejrelationshipjbetweenjvoidjratiojandjporosity.
, 3. Distinguishjbetweenj‘BlackjCottonjSoil’jandj‘Laterite’jfromjanjengineeringjpointjofjview
.
Blackjcottonjsoil-
jexpansive,jhighjshrinkjandjswelljcharacteristics,jblackjinjcolourjduejtojthejpresencejofj
iron,jmagnesiumjandjtitanium,foundjinjcentraljindiajandjportionjofjsouthjIndia.
Lateritejsoilj-
jredjinjcolourjduejtojFe2O3jwhichjundergoesjajprocessjcalledjlaterization,found jinjcen
traljandjS.EjIndia.
4. Establishjthejrelationshipjbetweenjdegreejofjsaturation,jsoiljmoisturejcontent,jspe
cificjgravityjofjsoiljparticles,jandjvoidjratio.
5. Differentiatejbetweenjsensitivityjandjthixotropyjofjsoils.
Sensitivityj(St)’jofjajclayjisjdefinedjasjthejratiojofjthejitsjunconfinedjcompressionjstr
engthjinjthejnaturaljorjundisturbedjstatejtojthatjinjthejremouldedjstate,jwithoutjanyjc
hangejinjthejwaterjcontent:
Thixotropy
Whenjclaysj withjajflocculentj structurejarejusedjinjconstruction,j thesejmayjlose
j j j j j j j j j
OF CIVIL ENGINEERING
j j
QUESTION BANK j
IV SEMESTER
j
CE208– GEOTECHNICAL ENGINEERING I
j j jj
BASEDj ON
A P J ABDUL KALAM TECHNOLOGICAL UNIVERSITY SYLLABUS
j j j j j j j
2015jADMISSION
AcademicjYearj2017jPrepar
edjbyjAsst.Prof.AnniejJoy
, MODULEj –I
SYLLABUS
• Introductionjtojsoiljmechanicsj-MajorjsoiljdepositsjofjIndia
• Basicjsoiljpropertiesj-
jVoidjratio,jporosity,jdegreejofjsaturation,jairjcontent,jpercentagejairjvoids,jmoisturejc
ontent,jspecificjgravity,junitjweightj-jRelationshipjbetweenjbasicjsoiljproperties
• Sensitivityj–jThixotropyj-j numericaljproblems
Semesterj Examj Marksj %j -15
TWOj MARKSj QUESTIONS
1. NamejthejfatherjofjSoiljMechanicsjandjDefinejSoiljmechanics.jDr.
KarljVonjTerzaghijisjthejfatherjofjSoiljMechanicsj.
Soiljmechanicsjisjdefinedjasjthejapplicationjofjthejlawsjandjprinciplesjofjmechanicsjan
djhydraulicsjtojengineeringjproblemsjdealingjwithjsoiljasjanjengineeringjmaterial.
2. Definejdegreejofjsaturationjandjporosity.
‘Degreejofjsaturation’jofjajsoiljmassjisjdefinedjasjthejratiojofjthejvolumejofjwaterjinjthej
voidsjtojthejvolumejofjvoids.
‘Porosity’jofjajsoiljmassjisjthejratiojofjthejvolumejofjvoidsjtojthejtotaljvolumejofjthejsoilj
mass.
3. Drawjthejphasejdiagramjforjcompletelyjdryjandjfullyjsaturatedjsoiljmass.
(a)jfullyjsaturatedjsoiljmassj(b)jcompletelyjdryjsoiljmass
4. Differentiatejbetweenj‘residual’jandj‘transported’jsoils.
Soilsjwhichjarejformedjbyjweatheringjofjrocksjandjwhichjremainjinjpositionjatjthejplac
ejofjtheirjoriginjarej‘ResidualjSoils’.
Soilsjthatjgetjtransportedjfromjthejplacejofjoriginjbyjvariousjagenciesjsuchjasjwind,jwat
er,jice,jgravity,jetc.jarejtermedjas‘‘Transportedjsoil’’.
5. Definejspecificjgravity.
Thejspecificjgravityjofjajsubstancejisjdefinedjasjthejratiojofjitsjmassjinjairjtojthejmassjofja
njequaljvolumejofjwaterjatjreferencejtemperature,j4j°C.
G=γs/γw
, 6. Sketchjthejphasejdiagramjforjajsoiljandjindicatejthejvolumesjandjweightsjofjthejphas
esjonjit.
7. Definej‘Voidjratio’jandj‘Waterjcontent’.
‘Voidjratio’jofjajsoiljmassjisjdefinedjasjthejratiojofjthejvolumejofjvoidsjtojthejvolumejofjsol
idsjinjthejsoiljmass.
‘Waterjcontent’jorj‘Moisturejcontent’jofjajsoiljmassjisjdefinedjasjthejratiojofjthejweightjofj
waterjtojthejweightjofjsolidsj(dryjweight)jofjthejsoiljmass.
8.
THREEj MARKSj QUESTIONS
1. Ifjthejvolumejofjvoidsjisjequaljtojthejvolumejofjsolidsjinjajgivenjsoiljsample,jFindjVoidjra
tiojandjporosity.
IfjVv=Vs,thenjvoidjratioje=jVv/Vsj=1jHen
ce,porosityjn=e/(1+e)=1/2=0.5
2. Usingjphasejdiagram,jderivejthejrelationshipjbetweenjvoidjratiojandjporosity.
, 3. Distinguishjbetweenj‘BlackjCottonjSoil’jandj‘Laterite’jfromjanjengineeringjpointjofjview
.
Blackjcottonjsoil-
jexpansive,jhighjshrinkjandjswelljcharacteristics,jblackjinjcolourjduejtojthejpresencejofj
iron,jmagnesiumjandjtitanium,foundjinjcentraljindiajandjportionjofjsouthjIndia.
Lateritejsoilj-
jredjinjcolourjduejtojFe2O3jwhichjundergoesjajprocessjcalledjlaterization,found jinjcen
traljandjS.EjIndia.
4. Establishjthejrelationshipjbetweenjdegreejofjsaturation,jsoiljmoisturejcontent,jspe
cificjgravityjofjsoiljparticles,jandjvoidjratio.
5. Differentiatejbetweenjsensitivityjandjthixotropyjofjsoils.
Sensitivityj(St)’jofjajclayjisjdefinedjasjthejratiojofjthejitsjunconfinedjcompressionjstr
engthjinjthejnaturaljorjundisturbedjstatejtojthatjinjthejremouldedjstate,jwithoutjanyjc
hangejinjthejwaterjcontent:
Thixotropy
Whenjclaysj withjajflocculentj structurejarejusedjinjconstruction,j thesejmayjlose
