example of shallow foundation design

7/26/2019 example of shallow foundation design

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UGANDA CHRISTIAN UNIVERSITY

FACULTY OF SCIENCE AND TECHNOLOGY

DEPARTMENT OF ENGINEERING AND ENVIRONMENT

BACHELOR OF SCIENCE IN CIVIL AND ENVIRONMENTAL ENGINEERING

YEAR THREE

FOUNDATION ENGINEERING SOIL INVESTIGATION REPORT

Group member Regisr!io" "umber Sig"!ure

SYLVIA #PANGE IS$%B&%'()$

MUGABI GILBERT S$&B&%'*&(

NASSANGA RHODAH S$&B&%'+,&

#-ESIGA SIMON S$&B&%'&$.

ADIBA#O RICHARD S$%B&%',$$

MBA/IRA APUULI

DANIEL

S$&B&%'*%&

#ABYANGA CRISPUS S$&B&%'

O-ANI ISAAC S$&B&%')$%

A#SANTI MUGANGA0ULIEN

IS$%B&%'


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TABLE OF CONTENTS

1.0 EXECUTIVE SUMMARY............................................................................................3

2.0 INTRODUCTION.....................................................................................................4

3.0 OBJECTIVES.......................................................................................................... 4

4.0 SCOPE OF ASSIGNMENT.......................................................................................4

5.0 SITE DESCRIPTION................................................................................................ 5

5.1 Site topo!"p#$................................................................................................. 5

5.2 S%!&"'e "() *%+*%!&"'e 'o()itio(*....................................................................5

5.3 Reio(", Geo,o$.............................................................................................. -

-.0 FIED INVESTIGATION.........................................................................................../

-.1 S"p,i(...........................................................................................................

-.2 Pe(et!"tio( te*t.................................................................................................

/.0 ABORATOR TEST.............................................................................................10

.0 RESUTS AND DISCUSSIONS...............................................................................10

.0 CONCUSIONS.................................................................................................... 10


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$1, E2ECUTIVE SUMMARY

This report describes the geo technical inestigation o! the site ad"acent to the Sciences

#aborator$ %loc& at the 'phill end. This assign(ent )as cond'cted b$ the third $ear %achelor o!

Science in Ciil and Eniron(ental Engineering st'dents at Uganda Christian Uniersit$.

A s$ste(atic approach )as 'sed to identi!$ the nat're o! soils at the site and their characteristicsand the obserations and test res'lts )ere 'sed to design an appropriate shallo) !o'ndation !or a

b'ilding that )o'ld be constr'cted there. Reco((endations are also (ade !or this t$pe o!

!o'ndation.

2.0 INTRODUCTIONThe third $ear st'dents o! %achelor o! Science In Ciil and Eniron(ental Engineering at

Uganda Christian Uniersit$ )ere tas&ed to !ind to design a !o'ndation )hich is str'ct'rall$

stable and s'itable !or the site ad"acent to the to the Science #aborator$ %loc& on the 'phill end.

This report highlights obserations arising !ro( is'al inspections* site tests and s'bse+'ent

anal$sis. The reason !or the selection o! a partic'lar !o'ndation has been )ell e,plained.

Concl'sions and reco((endations hae been (ade in case action needs to be ta&en in so(e

areas.

3.0 OBJECTIVES To design an appropriate and str'ct'ral sa!e !o'ndation

To !ind o't the geo-technical properties o! the soil at the site.

To (a&e appropriate reco((endations !or an$ constr'ction on the site

4.0 SCOPE OF ASSIGNMENTThe scope o! inestigation !or this st'd$ co(prises the !ollo)ing-

1. Collecting in!or(ation s'ch as geological and geotechnical (aps related to the site*

capital !acilities* and land 'se (aps.

/. Ma&ing isits !or site reconnaissance in order to collect in!or(ation abo't site nat're*

topograph$ o! the site* geological !eat'res and other properties concerning the site.

. igging o! a trial pit and sa(pling o! dist'rbed and 'ndist'rbed sa(ples.

2. 3er!or(ing o! the $na(ic Cone 3enetration test4C3 test5 and laborator$ tests*incl'ding (oist're content test

6. Appl$ing engineering anal$sis and eal'ation o! !ield !indings and laborator$ res'lts.


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5.0 SITE DESCRIPTIONThis site is located in Uganda Christian 'niersit$ (ain ca(p's* opposite the technolog$ par&

science laborator$. The region )here this site is located is generall$ hill$. It is enclosed b$ a

store$ b'ilding )hich is 'sed !or laborator$ actiities on its le!t side b't has bare land )ith trees

on it at the opposite side and it is directl$ accessible )itho't an$ (a"or obstr'ctions. There is an

e,isting ('rr'( access road ad"acent to it b't there no e,isting b'ilding on the site. There are no

actiities so no act'al land 'se and its neighboring b'ilding is still standing !ir(l$.

5.1 Site topo!"p#$

The site is relatiel$ !lat b't its s'rro'nding topograph$ is gentl$ sloping indicating that the site

)as preio'sl$ hill$ b't )as leeled !or constr'ction actiities. It has no c'rrent 'se and is

coered )ith a green egetation o! e+'al height signi!$ing the presence o! the sa(e t$pe o! top

soil rich in n'trients )ithin the area. The grass present is !resh and green sho)ing the presence

o! a !ertile soil.

5.2 S%!&"'e "() *%+*%!&"'e 'o()itio(*According to the site s're$ carried o't* there are generall$ si(ilarities and contin'ities o! the

s'bs'r!ace (aterials ho)eer so(e ariations )ere noticed )hen the trial pit )as d'g. At the

inspected site* the gro'nd)ater )as not enco'ntered in the trial pit.

The s'r!ace is coered green egetation o! e+'al height signi!$ing the presence o! the sa(e t$pe

o! top soil rich in n'trients )ithin the area. The grass present is !resh and green sho)ing the

presence o! a !ertile soil.

Vis'al pro!iling )as done to deter(ine the pro!ile o! the soil and it )as !o'nd o't that the soil

had t)o la$ers. The top la$er )hich is called oerb'rden soil )hich is dar& bro)n in color hadroots )hich 0.2( deep into the soil pro!ile. The second la$er o! the soil )as reddish bro)n in

color.

The s'bs'r!ace soil is a plastic soil as it st'c&ed together )hen to'ched sho)ing high leel o!

plasticit$ d'e to the !act that it has a higher (oist're content. 7hen the soil )as rolled* it bro&e

)hen !orced )as applied sho)ing a high percentage o! cla$ )ith a bit o! silt thro'gh its sti!!ness.

It can be ter(ed as a silt$ cla$ soil.

5.3 Reio(", Geo,o$Soils )ithin the M'&ono and 8a)a&o&ie !ield areas oerlie 'ndi!!erentiated 3reca(brian

granitic gneiss o! the base(ent co(ple, and shales* +'art9ites and ph$llites o! the Toro s$ste(

4:eological s're$ epart(ent* 1;


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)ithin the lo)er alle$ !loors and s)a(ps* and o,idi9ing* red iron rich loa(s that constit'te the

(id slopes. %oth t$pes o! soils $ielded p> al'es bet)een 6 and < on sat'ration )ith distilled

>/?. The higher gro'nd on )hich the (a"orit$ o! settle(ents are !o'nd e,hibit onl$ sporadic

occ'rrences o! laterite 4partiall$ as a res'lt o! land i(proe(ent5. In addition* sa(ples o! soil

)ere collected !ro( the central and so'thern regions o! Uganda that oerlie lithological 'nits

containing granites o! post base(ent age@ (e(bers o! the Mit$ana series* the &arag)e-An&olean

S$ste( and the %'n$oro Series (a!ic olcanic o! Meso9oic to Tertiar$ age@ and 3leistocene

olcanic and sedi(entar$ roc&s.

The highest Mg and Ce concentrations are associated )ith the Meso9oic to Tertiar$ and

3leistocene olcanic 4carbonatitic5 soils !ro( the icinit$ o! ort 3ortal* the ri!t alle$ and

Tororo. Mg and Ce concentrations )ithin soils deeloped on the other sa(pled soils la$ )ithin

the range obsered in soils oerl$ing the Toro s$ste( and the %ase(ent Co(ple, gneisses. It is

there!ore di!!ic'lt to attrib'te the spatial distrib'tion in EM cases to the si(ilar spatial

distrib'tion o! these 'nits )ith the M'&ono-#')ero-Ba(pala triangle.

Fi%!e 1- "p o& U"()" *#o/i( !eio(", eo,o$


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.0 FIED INVESTIGATIONThe !ield inestigation )as carried o't on the //01< !ro( ;26a( to 100a(. The !ollo)ing

tools )ere 'sed to carr$ o't the in sit' site inestigations@

>oe

Spade

Shoel

$na(ic cone 3enetro(eter

Core c'tter

oll$

irstl$* a rectang'lar trial pit o! abo't 1( )as d'g 'sing a hoe and a spade. A shoel )as 'sed to

clear the debris o!! the pit.

Fi%!e 1- E'""ti( t#e t!i", pit Fi%!e 2- A**e+,i( t#e DCP"'#i(e

.1 S"p,i(

%oth dist'rbed and 'ndist'rbed sa(ples )ere ta&en at the trial pit. The 'ndist'rbed sa(ple )as

ta&en 'sing a core c'tter )hich )as ra((ed into the pit b$ a doll$. A hoe )as den 'sed to digaro'nd the core c'tter so that the sa(ple can be re(oed. It )as then placed in a pol$thene bag

and tied to (aintain the (oist're content and other in sit' conditions o! the soil.

The dist'rbed sa(ple )as also pic&ed !ro( the e,caated soil and placed in a pol$thene bag.


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Fi%!e 3- U()i*t%!+e) *oi, *"p,e Fi%!e 4- Di*t%!+e) *oi,*"p,e

.2 Pe(et!"tio( te*t

A d$na(ic cone 3enetro(eter )as 'sed to carr$ o't the penetration teat. This instr'(ent consists

o! a


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Tr!i3 pi $ DCP ! ,,m

No o4 b3o5s Re!6i"gs

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example of shallow foundation design

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